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GMO U.S. CORE EQUITY FUND

Investment objective

High total return.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO U.S. CORE EQUITY FUND		Class III, GMO U.S. Core Equity Fund	Class IV, GMO U.S. Core Equity Fund	Class V, GMO U.S. Core Equity Fund	Class VI, GMO U.S. Core Equity Fund
Operating Expenses Column [Text]		Class III	Class IV	Class V	Class VI
Management fee		0.31%	0.31%	0.31%	0.31%
Shareholder service fee		0.15%	0.10%	0.085%	0.055%
Other expenses		0.03%	0.03%	0.03%	0.03%
Total annual operating expenses		0.49%	0.44%	0.43%	0.40%
Expense reimbursement	^[1]	(0.03%)	(0.03%)	(0.03%)	(0.03%)
Total annual operating expenses after expense reimbursement		0.46%	0.41%	0.40%	0.37%

[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated, regardless of whether or not you redeem your shares at the end of such periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO U.S. CORE EQUITY FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO U.S. Core Equity Fund	Class III	47	^[1]	154	271	613
Class IV, GMO U.S. Core Equity Fund	Class IV	42	^[1]	138	243	552
Class V, GMO U.S. Core Equity Fund	Class V	41	^[1]	135	238	539
Class VI, GMO U.S. Core Equity Fund	Class VI	38	^[1]	125	221	502

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 96% of the average value of its portfolio.

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the S&P 500 Index.

The Manager uses active investment management methods, which means that equities are bought and sold according to the Manager’s evaluation of companies’ published financial information, securities’ prices, equity and bond markets, and the overall economy.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, industry and sector exposure, and market capitalization.

Under normal circumstances, the Fund invests directly and indirectly (e.g., through underlying funds or derivatives) at least 80% of its assets in equity investments tied economically to the U.S. (see “Name Policies”). The terms “equities” and “equity investments” refer to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Management and Operational Risk – The Fund relies on GMO’s ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO’s proprietary investment techniques will fail to produce the desired results. The Fund’s portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

• Derivatives Risk – The use of derivatives involves the risk that their value may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk and counterparty risk.

• Leveraging Risk – The Fund’s use of derivatives and securities lending may cause its portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

• Smaller Company Risk – Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of small- and mid-cap companies often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalizations.

• Focused Investment Risk – Focusing investments in sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Market Disruption and Geopolitical Risk – Geopolitical and other events may disrupt securities markets and adversely affect global economies and markets. Those events as well as other changes in foreign and domestic economic and political conditions could adversely affect the value of the Fund’s investments.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund’s operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

^[1]

Highest Quarter: 16.59% (2Q2003)

Lowest Quarter: -17.14% (3Q2002)

Year-to-Date (as of 3/31/11): 4.41%

Average Annual Total Returns Periods Ending December 31, 2010

^[1]

Average Annual Total Returns GMO U.S. CORE EQUITY FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO U.S. Core Equity Fund	Class III	Return Before Taxes		8.82%	0.46%	0.88%	10.73%	Sep. 18, 1985
Return Before Taxes Class IV, GMO U.S. Core Equity Fund	Class IV	Return Before Taxes		8.84%	0.52%	0.93%	4.20%	Jan. 09, 1998
Return Before Taxes Class VI, GMO U.S. Core Equity Fund	Class VI	Return Before Taxes		8.95%	0.57%		3.96%	Jun. 30, 2003
Return After Taxes on Distributions Class III, GMO U.S. Core Equity Fund	Class III	Return After Taxes on Distributions		8.55%	(0.30%)	0.29%	7.93%	Sep. 18, 1985
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO U.S. Core Equity Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		6.05%	0.31%	0.62%	8.11%	Sep. 18, 1985
S&P 500 Index Class III, GMO U.S. Core Equity Fund	Class III	S&P 500 Index	(reflects no deduction for fees, expenses or taxes)	15.06%	2.29%	1.41%	10.52%	Sep. 18, 1985
S&P 500 Index Class IV, GMO U.S. Core Equity Fund	Class IV	S&P 500 Index	(reflects no deduction for fees, expenses or taxes)	15.06%	2.29%	1.41%	4.18%	Jan. 09, 1998
S&P 500 Index Class VI, GMO U.S. Core Equity Fund	Class VI	S&P 500 Index	(reflects no deduction for fees, expenses or taxes)	15.06%	2.29%		5.55%	Jun. 30, 2003

GMO TOBACCO-FREE CORE FUND

Investment objective

High total return.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO TOBACCO-FREE CORE FUND Class III, GMO Tobacco-Free Core Fund
Operating Expenses Column [Text]		Class III
Management fee		0.33%
Shareholder service fee		0.15%
Other expenses		0.53%
Total annual operating expenses		1.01%
Expense reimbursement	^[1]	(0.53%)
Total annual operating expenses after expense reimbursement		0.48%

[1]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO TOBACCO-FREE CORE FUND Class III, GMO Tobacco-Free Core Fund	Class III	49	^[1]	271	511	1,199

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund's investment objective by investing primarily in U.S. equities or groups of U.S. equities that the Manager believes will provide higher returns than the S&P 500 Index.

The Manager uses active investment management methods, which means that equities are bought and sold according to the Manager's evaluation of companies' published financial information, securities' prices, equity and bond markets, and the overall economy.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund's investment universe. The Manager also may adjust the Fund's portfolio for factors such as position size, industry and sector exposure, and market capitalization.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets, and expects to invest substantially all of its assets, in investments in tobacco-free companies (see “Name Policies”). For these purposes, the term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts, and the term “tobacco-free companies” refers to companies that are not listed in the Tobacco Producing Issuer industry classification maintained by Ford Investor Services.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Management and Operational Risk – The Fund relies on GMO's ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO's proprietary investment techniques will fail to produce the desired results. The Fund’s portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

• Derivatives Risk – The use of derivatives involves the risk that their value may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk and counterparty risk.

• Counterparty Risk – The Fund runs the risk that the counterparty to an OTC derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations.

• Leveraging Risk – The Fund’s use of derivatives and securities lending may cause its portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

• Smaller Company Risk – Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of small- and mid-cap companies often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalizations.

• Focused Investment Risk – Focusing investments in sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Market Disruption and Geopolitical Risk – Geopolitical and other events may disrupt securities markets and adversely affect global economies and markets. Those events as well as other changes in foreign and domestic economic and political conditions could adversely affect the value of the Fund’s investments.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund’s operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 15.80% (2Q2003)

Lowest Quarter: -17.27% (3Q2002)

Year-to-Date (as of 3/31/11): 4.43%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO TOBACCO-FREE CORE FUND Class III, GMO Tobacco-Free Core Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		9.28%	1.53%	1.05%	8.97%	Oct. 31, 1991
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		9.03%	0.72%	0.41%	6.49%	Oct. 31, 1991
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		6.33%	1.21%	0.74%	6.60%	Oct. 31, 1991
S&P 500 Index	Class III	S&P 500 Index	(reflects no deduction for fees, expenses, or taxes)	15.06%	2.29%	1.41%	8.43%	Oct. 31, 1991

GMO QUALITY FUND

Investment objective

Total return.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO QUALITY FUND		Class III, GMO Quality Fund	Class IV, GMO Quality Fund	Class V, GMO Quality Fund	Class VI, GMO Quality Fund
Operating Expenses Column [Text]		Class III	Class IV	Class V	Class VI
Management fee		0.33%	0.33%	0.33%	0.33%
Shareholder service fee		0.15%	0.105%	0.085%	0.055%
Other expenses		0.02%	0.02%	0.02%	0.02%
Total annual operating expenses		0.50%	0.46%	0.44%	0.41%
Expense reimbursement	^[1]	(0.02%)	(0.02%)	(0.02%)	(0.02%)
Total annual operating expenses after expense reimbursement		0.48%	0.44%	0.42%	0.39%

[1]

Example

Expense Example GMO QUALITY FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Quality Fund	Class III	49	^[1]	158	278	626
Class IV, GMO Quality Fund	Class IV	45	^[1]	146	256	577
Class V, GMO Quality Fund	Class V	43	^[1]	139	244	553
Class VI, GMO Quality Fund	Class VI	40	^[1]	130	228	516

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes to be of high quality.

In assessing a company’s quality, the Manager may consider several factors, including in particular, high return on equity, low debt to equity and the Manager’s assessment of the company relative to its competitors.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization and exposure to groups such as industry, sector, country or currency.

The Fund may hold fewer than 100 stocks. The Fund may make tactical allocations of up to 20% of its net assets to investments in cash and high quality debt instruments.

The Fund is permitted to invest directly and indirectly (e.g., through underlying funds or derivatives) in equities of companies tied economically to any country in the world, including emerging countries. The term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund may affect the Fund's performance more than if the Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Management and Operational Risk – The Fund relies on GMO's ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO's proprietary investment techniques will fail to produce the desired results. The Fund's portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager's or another service provider's internal systems or controls will cause losses for the Fund or impair Fund operations.

• Focused Investment Risk – Focusing investments in a limited number of countries, sectors or companies or in industries with high positive correlations to one another creates additional risk. The Fund invests its assets in the securities of a limited number of issuers, and a decline in the market value of a particular security held by the Fund may affect the Fund's performance more than if the Fund invested in the securities of a larger number of issuers.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Funds foreign currency holdings and investments denominated in foreign currencies.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 11.53% (3Q2010)

Lowest Quarter: -13.13% (4Q2008)

Year-to-Date (as of 3/31/11): 3.48%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO QUALITY FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO Quality Fund	Class III	Return Before Taxes		5.47%	2.77%	2.31%	Feb. 06, 2004
Return Before Taxes Class IV, GMO Quality Fund	Class IV	Return Before Taxes		5.51%	2.80%	2.35%	Feb. 06, 2004
Return Before Taxes Class V, GMO Quality Fund	Class V	Return Before Taxes		5.53%		0.75%	Dec. 08, 2006
Return Before Taxes Class VI, GMO Quality Fund	Class VI	Return Before Taxes		5.57%		0.78%	Dec. 08, 2006
Return After Taxes on Distributions Class III, GMO Quality Fund	Class III	Return After Taxes on Distributions		5.17%	2.44%	2.02%	Feb. 06, 2004
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Quality Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		3.91%	2.41%	2.00%	Feb. 06, 2004
S&P 500 Index Class III, GMO Quality Fund	Class III	S&P 500 Index	(reflects no deduction for fees, expenses, or taxes)	15.06%	2.29%	3.47%	Feb. 06, 2004
S&P 500 Index Class IV, GMO Quality Fund	Class IV	S&P 500 Index	(reflects no deduction for fees, expenses, or taxes)	15.06%	2.29%	3.47%	Feb. 06, 2004
S&P 500 Index Class V, GMO Quality Fund	Class V	S&P 500 Index	(reflects no deduction for fees, expenses, or taxes)	15.06%		(0.65%)	Dec. 08, 2006
S&P 500 Index Class VI, GMO Quality Fund	Class VI	S&P 500 Index	(reflects no deduction for fees, expenses, or taxes)	15.06%		(0.65%)	Dec. 08, 2006

GMO U.S. INTRINSIC VALUE FUND

Investment objective

Long-term capital growth.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO U.S. INTRINSIC VALUE FUND Class III, GMO U.S. Intrinsic Value Fund
Operating Expenses Column [Text]		Class III
Management fee		0.31%
Shareholder service fee		0.15%
Other expenses		1.30%
Total annual operating expenses		1.76%
Expense reimbursement	^[1]	(1.30%)
Total annual operating expenses after expense reimbursement		0.46%

[1]

Example

Expense Example (USD $)	1 Year		3 Years	5 Years	10 Years
GMO U.S. INTRINSIC VALUE FUND Class III, GMO U.S. Intrinsic Value Fund	47	^[1]	427	832	1,965

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the Russell 1000 Value Index.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments tied economically to the U.S. (see “Name Policies”). The term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund may affect the Fund’s performance more than if the Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Focused Investment Risk – Focusing investments in sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

^[2]

Highest Quarter: 19.25% (2Q2003)

Lowest Quarter: -18.29% (4Q2008)

Year-to-Date (as of 3/31/11): 9.10%

Average Annual Total Returns Periods Ending December 31, 2010

^[2]

Average Annual Total Returns GMO U.S. INTRINSIC VALUE FUND Class III, GMO U.S. Intrinsic Value Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		11.59%	(0.58%)	2.74%	3.24%	Aug. 02, 1999
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		11.31%	(1.79%)	1.43%	1.99%	Aug. 02, 1999
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		7.82%	(0.65%)	2.05%	2.46%	Aug. 02, 1999
Russell 1000 Value Index	Class III	Russell 1000 Value Index	(reflects no deduction for fees, expenses, or taxes)	15.51%	1.28%	3.26%	3.27%	Aug. 02, 1999

GMO U.S. GROWTH FUND

Investment objective

Long-term capital growth.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO U.S. GROWTH FUND Class III, GMO U.S. Growth Fund
Operating Expenses Column [Text]		Class III
Management fee		0.31%
Shareholder service fee		0.15%
Other expenses	^[1]	4.82%
Total annual operating expenses		5.28%
Expense reimbursement	^[2]	(4.81%)
Total annual operating expenses after expense reimbursement		0.47%

[1]

"Other expenses" have been restated to reflect current fees.

[2]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO U.S. GROWTH FUND Class III, GMO U.S. Growth Fund	Class III	48	^[1]	1,149	2,243	4,953

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the Russell 1000 Growth Index.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments tied economically to the U.S. (see “Name Policies”). The term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund may affect the Fund’s performance more than if the Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. The Fund may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Focused Investment Risk – Focusing investments in sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

^[3]

Highest Quarter: 15.03% (2Q2003)

Lowest Quarter: -21.46% (1Q2001)

Year-to-Date (as of 3/31/11): 4.78%

Average Annual Total Returns Periods Ending December 31, 2010

^[3]

Average Annual Total Returns GMO U.S. GROWTH FUND Class III, GMO U.S. Growth Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		13.94%	1.31%	(0.78%)	9.58%	Dec. 30, 1988
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		13.75%	0.88%	(1.31%)	5.35%	Dec. 30, 1988
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		9.29%	1.08%	(0.80%)	6.23%	Dec. 30, 1988
Russell 1000 Growth Index	Class III	Russell 1000 Growth Index	(reflects no deduction for fees, expenses, or taxes)	16.71%	3.75%	0.02%	9.04%	Dec. 30, 1988

GMO U.S. SMALL/MID CAP VALUE FUND

Investment objective

Long-term capital growth.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO U.S. SMALL/MID CAP VALUE FUND Class III, GMO U.S. Small/Mid Cap Value Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.50%
Redemption fee (as a percentage of amount redeemed)	0.50%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO U.S. SMALL/MID CAP VALUE FUND Class III, GMO U.S. Small/Mid Cap Value Fund
Operating Expenses Column [Text]		Class III
Management fee		0.31%
Shareholder service fee		0.15%
Other expenses	^[1]	1.77%
Total annual operating expenses		2.23%
Expense reimbursement	^[2]	(1.76%)
Total annual operating expenses after expense reimbursement		0.47%

[1]

"Other expenses" have been restated to reflect current fees.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO U.S. SMALL/MID CAP VALUE FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO U.S. Small/Mid Cap Value Fund USD ($)		Class III	150	^[1]	630	1,136	2,531		Class III	98	^[1]	575	1,078	2,464

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the Russell 2500 Value Index.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities of U.S. companies that issue stocks included in the Russell 2500 Index, a U.S. stock index, and in companies with similar market capitalizations (“small- and mid-cap companies”). Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments in small- and mid-cap companies tied economically to the U.S. (see “Name Policies”). As of May 31, 2011, the market capitalization of companies that issue stocks included in the Russell 2500 Index ranged from approximately $11.9 million to $11.7 billion, with an average market capitalization of approximately $3.1 billion and a median market capitalization of approximately $2.8 billion. The term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Liquidity Risk – Shares of small- and mid-cap companies often have lower trading volumes and a limited number or no market makers. Thus, a large position may limit or prevent the Fund from selling those shares or unwinding derivative positions on them at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Focused Investment Risk – Focusing investments in sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is a broad-based index) and a composite index computed by the Manager. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

^[4]

Highest Quarter: 23.22% (2Q2003)

Lowest Quarter: -20.74% (4Q2008)

Year-to-Date (as of 3/31/11): 8.05%

Average Annual Total Returns Periods Ending December 31, 2010

^[4]

Average Annual Total Returns GMO U.S. SMALL/MID CAP VALUE FUND Class III, GMO U.S. Small/Mid Cap Value Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		24.89%	0.21%	6.42%	10.80%	Dec. 31, 1991
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		24.71%	(0.78%)	4.04%	7.87%	Dec. 31, 1991
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		15.96%	(0.03%)	4.79%	8.21%	Dec. 31, 1991
Russell 2500 Value Index (Fund benchmark)	Class III	Russell 2500 Value Index (Fund benchmark)	(reflects no deduction for fees, expenses, or taxes)	24.82%	3.85%	8.53%	11.90%	Dec. 31, 1991
Russell 2500 Value + Index (Composite index)	Class III	Russell 2500 Value + Index (Composite index)		24.82%	3.85%	8.53%	11.28%	Dec. 31, 1991

GMO U.S. SMALL/MID CAP GROWTH FUND

Investment objective

Long-term capital growth.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO U.S. SMALL/MID CAP GROWTH FUND Class III, GMO U.S. Small/Mid Cap Growth Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.50%
Redemption fee (as a percentage of amount redeemed)	0.50%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO U.S. SMALL/MID CAP GROWTH FUND Class III, GMO U.S. Small/Mid Cap Growth Fund
Operating Expenses Column [Text]		Class III
Management fee		0.31%
Shareholder service fee		0.15%
Other expenses	^[1]	2.73%
Total annual operating expenses		3.19%
Expense reimbursement	^[2]	(2.72%)
Total annual operating expenses after expense reimbursement		0.47%

[1]

"Other expenses" have been restated to reflect current fees.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO U.S. SMALL/MID CAP GROWTH FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO U.S. Small/Mid Cap Growth Fund USD ($)		Class III	150	^[1]	827	1,530	3,400		Class III	98	^[1]	773	1,474	3,339

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the Russell 2500 Growth Index.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. The Fund may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Liquidity Risk – Shares of small- and mid-cap companies often have lower trading volumes and a limited number or no market makers. Thus, a large position may limit or prevent the Fund from selling those shares or unwinding derivative positions on them at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Focused Investment Risk – Focusing investments in sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

^[5]

Highest Quarter: 22.74% (2Q2003)

Lowest Quarter: -27.98% (4Q2008)

Year-to-Date (as of 3/31/11): 14.43%

Average Annual Total Returns Periods Ending December 31, 2010

^[5]

Average Annual Total Returns GMO U.S. SMALL/MID CAP GROWTH FUND Class III, GMO U.S. Small/Mid Cap Growth Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		32.07%	0.94%	3.36%	5.60%	Dec. 31, 1996
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		32.00%	(0.64%)	1.89%	0.75%	Dec. 31, 1996
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		20.46%	0.36%	2.45%	2.35%	Dec. 31, 1996
Russell 2500 Growth Index	Class III	Russell 2500 Growth Index	(reflects no deduction for fees, expenses, or taxes)	28.86%	5.63%	4.19%	6.22%	Dec. 31, 1996

GMO REAL ESTATE FUND

Investment objective

High total return.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO REAL ESTATE FUND Class III, GMO Real Estate Fund
Operating Expenses Column [Text]		Class III
Management fee		0.33%
Shareholder service fee		0.15%
Other expenses		0.58%
Total annual operating expenses		1.06%
Expense reimbursement	^[1]	(0.58%)
Total annual operating expenses after expense reimbursement		0.48%

[1]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO REAL ESTATE FUND Class III, GMO Real Estate Fund	Class III	49	^[1]	282	533	1,252

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in investments or groups of investments that the Manager believes will provide higher returns than the MSCI U.S. REIT Index.

The Manager uses active investment management methods, which means that investments are bought and sold according to the Manager’s evaluation of companies’ published financial information, securities’ prices, equity and bond markets, and the overall economy.

In selecting investments for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify investments that the Manager believes present positive return potential relative to other investments. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an investment or a group of investments. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an investment or group of investments relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, industry and sector exposure, and market capitalization.

As a substitute for direct investments, the Manager may use exchange-traded and over-the-counter (“OTC”) derivatives. The Manager also may use derivatives: (i) in an attempt to reduce investment exposures (which may result in a reduction below zero); (ii) in an attempt to adjust elements of the Fund’s investment exposure; and (iii) to effect transactions intended as substitutes for securities lending. Derivatives used may include futures, options and swap contracts. In addition, the Fund may lend its portfolio securities.

The Fund has a fundamental policy to concentrate its investments in real estate-related investments. Under normal circumstances, the Fund invests directly and indirectly (e.g., through underlying funds or derivatives) at least 80% of its assets in real estate investment trusts (“REITs”) and other real estate-related investments (see “Name Policies”). REITs are managed vehicles that invest in real estate or real estate-related investments (both equity and fixed income securities). For purposes of this Prospectus, the term “real estate-related investments” includes securities of REITs and of companies that derive at least 50% of their revenues and profits from, or have at least 50% of their assets invested in, (i) the development, construction, management, or sale of real estate or (ii) real estate holdings.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended (the “1940 Act”), and therefore a decline in the market value of a particular security held by the Fund may affect the Fund’s performance more than if the Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Real Estate Risk – Real estate-related investments may decline in value as a result of factors affecting the real estate industry, such as the supply of real property in particular markets, changes in zoning laws, delays in completion of construction, changes in real estate values, changes in property taxes, levels of occupancy, adequacy of rent to cover operating expenses, and local and regional market conditions. The value of real estate-related investments also may be affected by changes in interest rates and social and economic trends. REITs are subject to the risk of fluctuations in income from underlying real estate assets, their inability to manage effectively the cash flows generated by those assets, prepayments and defaults by borrowers, and failing to qualify for the special tax treatment granted to REITs under the Internal Revenue Code of 1986 and/or to maintain exempt status under the 1940 Act.

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Management and Operational Risk – The Fund relies on GMO’s ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO’s proprietary investment techniques will fail to produce the desired results. The Fund’s portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Models that have demonstrated an ability to explain prior market data often fail to accurately predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

• Focused Investment Risk – Focusing investments in sectors and industries with high positive correlations to one another creates additional risk. The Fund’s concentration in real estate-related investments make the Fund’s net asset value more susceptible to economic, market, political and other developments affecting the real estate industry.

• Market Risk – Fixed Income Securities – Typically, the market value of the Fund’s fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index and the Fund’s benchmark, which more accurately reflects the Fund’s investments. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 32.69% (3Q2009)

Lowest Quarter: -35.42% (4Q2008)

Year-to-Date (as of 3/31/11): 6.58%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO REAL ESTATE FUND Class III, GMO Real Estate Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		27.40%	3.52%	9.98%	9.34%	May 31, 1996
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		25.92%	(0.12%)	6.85%	6.37%	May 31, 1996
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		17.68%	1.57%	7.47%	6.79%	May 31, 1996
MSCI U.S. REIT Index (Fund benchmark)	Class III	MSCI U.S. REIT Index (Fund benchmark)	(returns reflect no deduction for fees, expenses, or taxes)	28.48%	2.99%	10.57%	10.42%	May 31, 1996
S&P 500 Index	Class III	S&P 500 Index	(reflects no deduction for fees, expenses, or taxes)	15.06%	2.29%	1.41%	6.29%	May 31, 1996

GMO TAX-MANAGED U.S. EQUITIES FUND

Investment objective

High after-tax total return.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO TAX-MANAGED U.S. EQUITIES FUND Class III, GMO Tax-Managed U.S. Equities Fund
Operating Expenses Column [Text]		Class III
Management fee		0.33%
Shareholder service fee		0.15%
Other expenses		0.56%
Total annual operating expenses		1.04%
Expense reimbursement	^[1]	(0.56%)
Total annual operating expenses after expense reimbursement		0.48%

[1]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO TAX-MANAGED U.S. EQUITIES FUND Class III, GMO Tax-Managed U.S. Equities Fund	Class III	49	^[1]	277	524	1,231

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the Russell 3000 Index.

The Manager considers the tax effects of a proposed trade in conjunction with the return forecast of the identified equities, and their potential contribution to the overall portfolio. The Manager also may consider the Fund’s realized and unrealized gains and losses, and current market conditions, because these factors also influence the decision to buy or sell securities.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. There can be no assurance that the Fund’s tax management strategies will be effective, and you may incur tax liabilities that exceed your economic return. The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund may affect the Fund’s performance more than if the Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Management and Operational Risk – The Fund relies on GMO’s ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO’s proprietary investment techniques will fail to produce the desired results. The Fund’s portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Models that have demonstrated an ability to explain prior market data often fail to accurately predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

• Focused Investment Risk – Focusing investments in sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is a broad-based index) and a composite index computed by the Manager. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares (Before Tax) Years Ending December 31

Highest Quarter: 16.69% (2Q2003)

Lowest Quarter: -17.54% (3Q2002)

Year-to-Date (as of 3/31/11): 3.92%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO TAX-MANAGED U.S. EQUITIES FUND Class III, GMO Tax-Managed U.S. Equities Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		8.81%	0.36%	0.53%	2.71%	Jul. 23, 1998
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		8.54%	0.07%	0.22%	2.36%	Jul. 23, 1998
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		6.05%	0.30%	0.37%	2.22%	Jul. 23, 1998
Russell 3000 Index (Fund benchmark)	Class III	Russell 3000 Index (Fund benchmark)	(reflects no deduction for fees, expenses, or taxes)	16.93%	2.74%	2.16%	3.25%	Jul. 23, 1998
Russell 3000 + Index (Composite index)	Class III	Russell 3000 + Index (Composite index)		16.93%	2.77%	1.65%	2.78%	Jul. 23, 1998

GMO INTERNATIONAL CORE EQUITY FUND

Investment objective

High total return.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO INTERNATIONAL CORE EQUITY FUND		Class III, GMO International Core Equity Fund	Class IV, GMO International Core Equity Fund	Class VI, GMO International Core Equity Fund
Operating Expenses Column [Text]		Class III	Class IV	Class VI
Management fee		0.38%	0.38%	0.38%
Shareholder service fee		0.15%	0.09%	0.055%
Other expenses		0.05%	0.05%	0.05%
Total annual operating expenses		0.58%	0.52%	0.49%
Expense reimbursement	^[1]	(0.05%)	(0.05%)	(0.05%)
Total annual operating expenses after expense reimbursement		0.53%	0.47%	0.44%

[1]

Example

Expense Example GMO INTERNATIONAL CORE EQUITY FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO International Core Equity Fund	Class III	54	^[1]	181	319	721
Class IV, GMO International Core Equity Fund	Class IV	48	^[1]	162	286	648
Class VI, GMO International Core Equity Fund	Class VI	45	^[1]	152	269	611

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the MSCI EAFE Index.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities of companies tied economically to countries other than the U.S. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in equity investments (see “Name Policies”). The terms “equities” and “equity investments” refer to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. The Manager may make investments tied economically to emerging countries.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Derivatives Risk – The use of derivatives involves the risk that their value may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk, currency risk and counterparty risk.

• Leveraging Risk – The Fund’s use of derivatives and securities lending may cause its portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

• Smaller Company Risk – Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of small- and mid-cap companies often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalizations.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Market Disruption and Geopolitical Risk – Geopolitical and other events may disrupt securities markets and adversely affect global economies and markets. Those events as well as other changes in foreign and domestic economic and political conditions could adversely affect the value of the Fund’s investments.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund’s operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

^[6]

Highest Quarter: 22.30% (2Q2009)

Lowest Quarter: -19.92% (3Q2008)

Year-to-Date (as of 3/31/11): 3.48%

Average Annual Total Returns Periods Ending December 31, 2010

^[6]

Average Annual Total Returns GMO INTERNATIONAL CORE EQUITY FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO International Core Equity Fund	Class III	Return Before Taxes		10.29%	2.09%	8.65%	Jan. 29, 2002
Return Before Taxes Class IV, GMO International Core Equity Fund	Class IV	Return Before Taxes		10.34%	2.15%	9.14%	Jun. 30, 2003
Return Before Taxes Class VI, GMO International Core Equity Fund	Class VI	Return Before Taxes		10.39%		0.59%	Mar. 28, 2006
Return After Taxes on Distributions Class III, GMO International Core Equity Fund	Class III	Return After Taxes on Distributions		10.11%	1.28%	7.88%	Jan. 29, 2002
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO International Core Equity Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		7.28%	1.73%	7.50%	Jan. 29, 2002
MSCI EAFE Index Class III, GMO International Core Equity Fund	Class III	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	7.41%	Jan. 29, 2002
MSCI EAFE Index Class IV, GMO International Core Equity Fund	Class IV	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	9.32%	Jun. 30, 2003
MSCI EAFE Index Class VI, GMO International Core Equity Fund	Class VI	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%		0.82%	Mar. 28, 2006

GMO INTERNATIONAL INTRINSIC VALUE FUND

Investment objective

High total return.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO INTERNATIONAL INTRINSIC VALUE FUND		Class II, GMO International Intrinsic Value Fund	Class III, GMO International Intrinsic Value Fund	Class IV, GMO International Intrinsic Value Fund
Operating Expenses Column [Text]		Class II	Class III	Class IV
Management fee		0.50%	0.50%	0.50%
Shareholder service fee		0.22%	0.15%	0.09%
Other expenses		0.05%	0.05%	0.05%
Total annual operating expenses		0.77%	0.70%	0.64%
Expense reimbursement	^[1]	(0.05%)	(0.05%)	(0.05%)
Total annual operating expenses after expense reimbursement		0.72%	0.65%	0.59%

[1]

Example

Expense Example GMO INTERNATIONAL INTRINSIC VALUE FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class II, GMO International Intrinsic Value Fund	Class II	74	^[1]	241	423	949
Class III, GMO International Intrinsic Value Fund	Class III	66	^[1]	219	385	866
Class IV, GMO International Intrinsic Value Fund	Class IV	60	^[1]	200	352	794

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the MSCI EAFE Value Index.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities of companies tied economically to countries other than the U.S. The term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. The Manager may make investments tied economically to emerging countries.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark and an additional broad-based international stock index selected by the Manager. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After tax returns are shown for Class III Shares only; after tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 22.40% (2Q2009)

Lowest Quarter: -18.13% (3Q2008)

Year-to-Date (as of 3/31/11): 4.16%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO INTERNATIONAL INTRINSIC VALUE FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes Class II, GMO International Intrinsic Value Fund	Class II	Return Before Taxes		7.53%	1.41%	6.73%	6.98%	Sep. 26, 1996
Return Before Taxes Class III, GMO International Intrinsic Value Fund	Class III	Return Before Taxes		7.59%	1.48%	6.80%	8.45%	Mar. 31, 1987
Return Before Taxes Class IV, GMO International Intrinsic Value Fund	Class IV	Return Before Taxes		7.61%	1.54%	6.88%	7.54%	Jan. 09, 1998
Return After Taxes on Distributions Class III, GMO International Intrinsic Value Fund	Class III	Return After Taxes on Distributions		7.58%	0.24%	5.72%	6.78%	Mar. 31, 1987
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO International Intrinsic Value Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		5.43%	1.36%	5.84%	6.78%	Mar. 31, 1987
MSCI EAFE Index Class II, GMO International Intrinsic Value Fund	Class II	MSCI EAFE Index	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	4.67%	Sep. 26, 1996
MSCI EAFE Index Class III, GMO International Intrinsic Value Fund	Class III	MSCI EAFE Index	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	5.31%	Mar. 31, 1987
MSCI EAFE Index Class IV, GMO International Intrinsic Value Fund	Class IV	MSCI EAFE Index	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	5.05%	Jan. 09, 1998
MSCI EAFE Value Index (Fund benchmark) Class II, GMO International Intrinsic Value Fund	Class II	MSCI EAFE Value Index (Fund benchmark)	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	3.25%	1.37%	4.19%	5.80%	Sep. 26, 1996
MSCI EAFE Value Index (Fund benchmark) Class III, GMO International Intrinsic Value Fund	Class III	MSCI EAFE Value Index (Fund benchmark)	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	3.25%	1.37%	4.19%	7.27%	Mar. 31, 1987
MSCI EAFE Value Index (Fund benchmark) Class IV, GMO International Intrinsic Value Fund	Class IV	MSCI EAFE Value Index (Fund benchmark)	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	3.25%	1.37%	4.19%	6.26%	Jan. 09, 1998

GMO INTERNATIONAL LARGE/MID CAP VALUE FUND

Investment Objective

High total return.

Fees and Expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO INTERNATIONAL LARGE/MID CAP VALUE FUND		Class III, GMO International Large/Mid Cap Value Fund	Class IV, GMO International Large/Mid Cap Value Fund	Class V, International Large/Mid Cap Value Fund	Class VI, GMO International Large/Mid Cap Value Fund
Operating Expenses Column [Text]		Class III	Class IV	Class V	Class VI
Management fee		0.50%	0.50%	0.50%	0.50%
Shareholder service fee		0.15%	0.09%	0.085%	0.055%
Other expenses	^[1]	0.15%	0.15%	0.15%	0.15%
Total annual operating expenses	^[1]	0.80%	0.74%	0.74%	0.71%
Expense reimbursement	^[1][2]	(0.14%)	(0.14%)	(0.14%)	(0.14%)
Total annual operating expenses after expense reimbursement	^[1]	0.66%	0.60%	0.60%	0.57%

[1]

The amounts represent an annualized estimate of the Fund's operating expenses for its initial fiscal year.

[2]

Example

Expense Example GMO INTERNATIONAL LARGE/MID CAP VALUE FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year	3 Years
Class III, GMO International Large/Mid Cap Value Fund	Class III	82	255
Class IV, GMO International Large/Mid Cap Value Fund	Class IV	76	237
Class V, International Large/Mid Cap Value Fund	Class V	76	237
Class VI, GMO International Large/Mid Cap Value Fund	Class VI	73	227

Portfolio Turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. Because the Fund commenced operations on or following the date of this Prospectus, the Fund’s portfolio turnover rate is not available.

Principal Investment Strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the MSCI EAFE Value Index.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities of non-U.S. companies that issue stocks included in the MSCI Standard Indices, international stock indices, and in companies with similar market capitalizations (“large- and mid-cap companies”). Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in securities of large- and mid-cap companies (see “Name Policies”). For these purposes, non-U.S. companies are companies tied economically to countries other than the U.S. and include both developed and emerging countries. For purposes of the Fund’s investments, the term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. The Manager may make investments tied economically to emerging countries.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal Risks of Investing in the Fund

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. The Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Management and Operational Risk – The Fund relies on GMO’s ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO’s proprietary investment techniques will fail to produce the desired results. The Fund’s portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

Because the Fund had not yet completed a full calendar year of operations as of the date of this Prospectus, performance information for the Fund is not included.

GMO INTERNATIONAL GROWTH EQUITY FUND

Investment objective

High total return.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO INTERNATIONAL GROWTH EQUITY FUND		Class III, GMO International Growth Equity Fund	Class IV, GMO International Growth Equity Fund
Operating Expenses Column [Text]		Class III	Class IV
Management fee		0.50%	0.50%
Shareholder service fee		0.15%	0.09%
Other expenses		0.05%	0.05%
Total annual operating expenses		0.70%	0.64%
Expense reimbursement	^[1]	(0.05%)	(0.05%)
Total annual operating expenses after expense reimbursement		0.65%	0.59%

[1]

Example

Expense Example GMO INTERNATIONAL GROWTH EQUITY FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO International Growth Equity Fund	Class III	66	^[1]	221	389	877
Class IV, GMO International Growth Equity Fund	Class IV	60	^[1]	202	356	805

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund's investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the MSCI EAFE Growth Index.

The Manager uses active investment management methods, which means that equities are bought and sold according to the Manager’s evaluation of companies' published financial information, securities' prices, equity and bond markets, and the overall economy.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund's portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. The Fund may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark and an additional broad-based international stock index selected by the Manager. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

^[7]

Highest Quarter: 17.83% (3Q2010)

Lowest Quarter: -19.33% (3Q2008)

Year-to-Date (as of 3/31/11): 1.77%

Average Annual Total Returns Periods Ending December 31, 2010

^[7]

Average Annual Total Returns GMO INTERNATIONAL GROWTH EQUITY FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO International Growth Equity Fund	Class III	Return Before Taxes		14.02%	4.48%	8.02%	Nov. 30, 2001
Return Before Taxes Class IV, GMO International Growth Equity Fund	Class IV	Return Before Taxes		14.13%		3.28%	Jul. 12, 2006
Return After Taxes on Distributions Class III, GMO International Growth Equity Fund	Class III	Return After Taxes on Distributions		14.02%	2.88%	6.82%	Nov. 30, 2001
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO International Growth Equity Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		9.49%	3.55%	6.77%	Nov. 30, 2001
MSCI EAFE Index Class III, GMO International Growth Equity Fund	Class III	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	6.73%	Nov. 30, 2001
MSCI EAFE Index Class IV, GMO International Growth Equity Fund	Class IV	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%		0.79%	Jul. 12, 2006
MSCI EAFE Growth Index (Fund benchmark) Class III, GMO International Growth Equity Fund	Class III	MSCI EAFE Growth Index (Fund benchmark)	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	12.25%	3.46%	6.28%	Nov. 30, 2001
MSCI EAFE Growth Index (Fund benchmark) Class IV, GMO International Growth Equity Fund	Class IV	MSCI EAFE Growth Index (Fund benchmark)	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	12.25%		2.07%	Jul. 12, 2006

GMO DEVELOPED WORLD STOCK FUND

Investment objective

High total return.

Fees and expenses

The tables below describe the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees GMO DEVELOPED WORLD STOCK FUND		Class III, GMO Developed World Stock Fund	Class IV, GMO Developed World Stock Fund
Shareholder Fees Column [Text]		Class III	Class IV
Purchase premium (as a percentage of amount invested)	^[1]	0.25%	0.25%
Redemption fee (as a percentage of amount redeemed)	^[1]	0.25%	0.25%

[1]	An additional purchase premium and redemption fee of 0.005% is charged for any purchases/redemptions (or any portion of a purchase/redemption) effected in a currency other than the U.S. dollar.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO DEVELOPED WORLD STOCK FUND		Class III, GMO Developed World Stock Fund	Class IV, GMO Developed World Stock Fund
Operating Expenses Column [Text]		Class III	Class IV
Management fee		0.45%	0.45%
Shareholder service fee		0.15%	0.10%
Other expenses		0.11%	0.11%
Total annual operating expenses		0.71%	0.66%
Expense reimbursement	^[1]	(0.11%)	(0.11%)
Total annual operating expenses after expense reimbursement		0.60%	0.55%

[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO DEVELOPED WORLD STOCK FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Developed World Stock Fund USD ($)		Class III	112	^[1]	269	439	933		Class III	86	^[1]	240	408	895
Class IV, GMO Developed World Stock Fund USD ($)		Class IV	107	^[1]	253	412	873		Class IV	81	^[1]	225	381	835

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in stocks or groups of stocks that the Manager believes will provide higher returns than the MSCI World Index.

The Manager uses active investment management methods, which means that stocks are bought and sold according to the Manager’s evaluation of companies’ published financial information, securities’ prices, equity and bond markets, and the overall economy.

In selecting stocks for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify stocks that the Manager believes present positive return potential relative to other stocks. Some of these methods evaluate individual stocks or a group of stocks (e.g., stocks of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of a stock or a group of stocks. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of a stock or group of stocks relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

As a substitute for direct investments in stocks, the Manager may use exchange-traded and over-the-counter (“OTC”) derivatives. The Manager also may use derivatives: (i) in an attempt to reduce investment exposures (which may result in a reduction below zero); (ii) in an attempt to adjust elements of the Fund’s investment exposure; and (iii) to effect transactions intended as substitutes for securities lending. Derivatives used may include futures, options, forward currency contracts and swap contracts. In addition, the Fund may lend its portfolio securities.

Under normal circumstances, the Fund invests directly and indirectly (e.g., through underlying funds or derivatives) at least 80% of its assets in stocks tied economically to developed markets (see “Name Policies”). For this purpose, the term “stocks” refers to investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts, and the term “developed markets” refers to those countries included in the MSCI World Index, a global developed markets equity index, and countries with similar characteristics (e.g., countries that have sustained economic development, sufficient liquidity for listed companies and accessible markets). The Manager may make investments tied economically to emerging countries.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 18.37% (2Q2009)

Lowest Quarter: -19.92% (4Q2008)

Year-to-Date (as of 3/31/11): 4.62%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO DEVELOPED WORLD STOCK FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO Developed World Stock Fund	Class III	Return Before Taxes		9.82%	1.78%	2.64%	Aug. 01, 2005
Return Before Taxes Class IV, GMO Developed World Stock Fund	Class IV	Return Before Taxes		9.93%	1.83%	2.51%	Sep. 01, 2005
Return After Taxes on Distributions Class III, GMO Developed World Stock Fund	Class III	Return After Taxes on Distributions		9.30%	0.85%	1.76%	Aug. 01, 2005
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Developed World Stock Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		6.64%	1.31%	2.06%	Aug. 01, 2005
MSCI World Index Class III, GMO Developed World Stock Fund	Class III	MSCI World Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.76%	2.43%	3.38%	Aug. 01, 2005
MSCI World Index Class IV, GMO Developed World Stock Fund	Class IV	MSCI World Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.76%	2.43%	3.17%	Sep. 01, 2005

GMO INTERNATIONAL SMALL COMPANIES FUND

Investment objective

High total return.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO INTERNATIONAL SMALL COMPANIES FUND Class III, GMO International Small Companies Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.50%
Redemption fee (as a percentage of amount redeemed)	0.50%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO INTERNATIONAL SMALL COMPANIES FUND Class III, GMO International Small Companies Fund
Operating Expenses Column [Text]		Class III
Management fee		0.60%
Shareholder service fee		0.15%
Other expenses	^[1]	0.13%
Total annual operating expenses		0.88%
Expense reimbursement	^[2]	(0.13%)
Total annual operating expenses after expense reimbursement		0.75%

[1]

"Other expenses" have been restated to reflect current fees.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO INTERNATIONAL SMALL COMPANIES FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO International Small Companies Fund USD ($)		Class III	178	^[1]	373	583	1,192		Class III	126	^[1]	316	523	1,117

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund's investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the MSCI EAFE Small Cap Index.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities of non-U.S. small companies. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in securities of small companies (see “Name Policies”). For these purposes, non-U.S. companies are companies tied economically to countries other than the U.S., and include both developed and emerging companies (“Non-U.S. Companies”). The Manager considers “small companies” to be all Non-U.S. Companies other than (i) the largest 500 companies in developed countries based on full, non-float adjusted market capitalization and (ii) any company in an emerging country with a full, non-float adjusted market capitalization that is greater than or equal to that of the smallest excluded developed country companies. A company’s full, non-float adjusted market capitalization includes all of the company’s outstanding equity securities. As of May 31, 2011, the market capitalization of the outstanding common stock and other stock-related securities of the largest company included within the Fund’s definition of small companies was approximately $8.3 billion. For purposes of the Fund’s investments, the term “equities” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. The Manager may make investments tied economically to emerging countries.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Liquidity Risk – Shares of small- and mid-cap companies often have lower trading volumes and a limited number or no market makers. Thus, a large position may limit or prevent the Fund from selling those shares or unwinding derivative positions on them at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Smaller Company Risk – Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of small companies often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalizations.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is a broad-based index) and a composite index computed by the Manager. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 32.07% (2Q2009)

Lowest Quarter: -21.15% (3Q2008)

Year-to-Date (as of 3/31/11): 1.71%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO INTERNATIONAL SMALL COMPANIES FUND Class III, GMO International Small Companies Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		19.97%	4.81%	11.94%	9.83%	Oct. 14, 1991
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		19.52%	1.91%	9.08%	7.53%	Oct. 14, 1991
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		13.01%	3.46%	9.78%	7.86%	Oct. 14, 1991
MSCI EAFE Small Cap Index (Fund benchmark)	Class III	MSCI EAFE Small Cap Index (Fund benchmark)	(returns reflect no deductions for fees or expenses, but are net of withholding tax on dividend reinvestments)	22.04%	2.81%	9.45%		Oct. 14, 1991
MSCI EAFE Small Cap + Index (Composite index)	Class III	MSCI EAFE Small Cap + Index (Composite index)		22.04%	5.70%	9.56%	7.20%	Oct. 14, 1991

GMO ASSET ALLOCATION INTERNATIONAL SMALL COMPANIES FUND

Investment Objective

High total return.

Fees and Expenses

The tables below describe the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees	GMO ASSET ALLOCATION INTERNATIONAL SMALL COMPANIES FUND Class III, GMO Asset Allocation International Small Companies Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.50%
Redemption fee (as a percentage of amount redeemed)	0.50%

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO ASSET ALLOCATION INTERNATIONAL SMALL COMPANIES FUND Class III, GMO Asset Allocation International Small Companies Fund
Operating Expenses Column [Text]		Class III
Management fee		0.60%
Shareholder service fee		0.15%
Other expenses	^[1]	0.14%
Total annual operating expenses	^[1]	0.89%
Expense reimbursement	^[1][2]	(0.14%)
Total annual operating expenses after expense reimbursement	^[1]	0.75%

[1]

The amounts represent an annualized estimate of the Fund's operating expenses for its initial fiscal year.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO ASSET ALLOCATION INTERNATIONAL SMALL COMPANIES FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year	3 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year	3 Years
GMO Trust	If you sell your shares				If you do not sell your shares
Class III, GMO Asset Allocation International Small Companies Fund USD ($)		Class III	192	389		Class III	140	332

Portfolio Turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. Because the Fund commenced operations on or following the date of this Prospectus, the Fund's portfolio turnover rate is not available.

Principal Investment Strategies

The Manager pursues the Fund's investment objective by using investment strategies designed to complement broader asset allocation strategies being implemented by the Manager in other Asset Allocation Funds or accounts. Accordingly, the Fund is not a standalone investment. The Manager uses multi-year forecasts of relative value and risk to determine the Fund's strategic direction.

The Manager typically seeks to achieve the Fund's investment objective by investing in equities or groups of equities of non-U.S. small companies.

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund's investment universe. The Manager also may adjust the Fund's portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

As a substitute for direct investments in equities, the Manager may use exchange-traded and over-the-counter ("OTC") derivatives. The Manager also may use derivatives: (i) in an attempt to reduce investment exposures (which may result in a reduction below zero); (ii) in an attempt to adjust elements of the Fund's investment exposure; and (iii) to effect transactions intended as substitutes for securities lending. Derivatives used may include futures, options, forward currency contracts and swap contracts. In addition, the Fund may lend its portfolio securities.

The Fund typically invests directly and indirectly (e.g., through underlying funds or derivatives) in equities of non-U.S. small companies. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in securities of small companies (see "Name Policies"). For these purposes, non-U.S. companies are companies tied economically to countries other than the U.S., and include both developed and emerging companies ("Non-U.S. Companies"). The Manager considers “small companies” to be all Non-U.S. Companies other than (i) the largest 500 companies in developed countries based on full, non-float adjusted market capitalization and (ii) any company in an emerging country with a full, non-float adjusted market capitalization that is greater than or equal to that of the smallest excluded developed country companies. A company's full, non-float adjusted market capitalization includes all of the company's outstanding equity securities. As of May 31, 2011, the market capitalization of the outstanding common stock and other stock-related securities of the largest company included within the Fund's definition of small companies was approximately $8.3 billion. For purposes of the Fund's investments, the term "equities" refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. The Manager may make investments tied economically to emerging countries.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal Risks of Investing in the Fund

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Smaller Company Risk – Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of small companies often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalizations.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

Because the Fund had not yet completed a full calendar year of operations as of the date of this Prospectus, performance information for the Fund is not included.

GMO TAX-MANAGED INTERNATIONAL EQUITIES FUND

Investment objective

High after-tax total return.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO TAX-MANAGED INTERNATIONAL EQUITIES FUND Class III, GMO Tax-Managed International Equities Fund
Operating Expenses Column [Text]		Class III
Management fee		0.50%
Shareholder service fee		0.15%
Other expenses		0.11%
Total annual operating expenses		0.76%
Expense reimbursement	^[1]	(0.11%)
Total annual operating expenses after expense reimbursement		0.65%

[1]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO TAX-MANAGED INTERNATIONAL EQUITIES FUND Class III, GMO Tax-Managed International Equities Fund	Class III	66	^[1]	232	412	932

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager seeks to achieve the Fund’s investment objective by investing in equities or groups of equities that the Manager believes will provide higher returns than the MSCI EAFE Index (after tax).

In selecting equities for the Fund, the Manager may use a combination of quantitative and qualitative investment methods to identify equities that the Manager believes present positive return potential relative to other equities. Some of these methods evaluate individual equities or a group of equities (e.g., equities of companies in a particular industry) based on the ratio of their price to historical financial information, including book value, cash flow and earnings, and forecasted financial information provided by industry analysts. The Manager may compare these ratios to industry or market averages in assessing the relative attractiveness of an equity or a group of equities. Other methods used by the Manager focus on evaluating patterns of price movement or volatility of an equity or group of equities relative to the Fund’s investment universe. The Manager also may adjust the Fund’s portfolio for factors such as position size, market capitalization, and exposure to groups such as industry, sector, country or currency.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is computed by the Manager) and a broad-based international stock index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares (Before Tax) Years Ending December 31

Highest Quarter: 21.51% (2Q2009)

Lowest Quarter: -20.34% (3Q2008)

Year-to-Date (as of 3/31/11): 4.05%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO TAX-MANAGED INTERNATIONAL EQUITIES FUND Class III, GMO Tax-Managed International Equities Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		9.49%	2.76%	7.67%	7.10%	Jul. 29, 1998
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		9.30%	1.99%	6.98%	6.47%	Jul. 29, 1998
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		6.82%	2.57%	6.76%	6.24%	Jul. 29, 1998
MSCI EAFE Index (after tax) (Fund benchmark)	Class III	MSCI EAFE Index (after tax) (Fund benchmark)	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	6.85%	1.55%	2.88%	3.05%	Jul. 29, 1998
MSCI EAFE Index	Class III	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	3.74%	Jul. 29, 1998

GMO FOREIGN FUND

Investment objective

Total return in excess of that of its benchmark, the MSCI EAFE Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO FOREIGN FUND		Class II, GMO Foreign Fund	Class III, GMO Foreign Fund	Class IV, GMO Foreign Fund
Operating Expenses Column [Text]		Class II	Class III	Class IV
Management fee		0.60%	0.60%	0.60%
Shareholder service fee		0.22%	0.15%	0.09%
Other expenses		0.06%	0.06%	0.06%
Total annual operating expenses		0.88%	0.81%	0.75%
Expense reimbursement	^[1]	(0.06%)	(0.06%)	(0.06%)
Total annual operating expenses after expense reimbursement		0.82%	0.75%	0.69%

[1]

Example

Expense Example GMO FOREIGN FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class II, GMO Foreign Fund	Class II	84	^[1]	275	482	1,079
Class III, GMO Foreign Fund	Class III	77	^[1]	253	444	996
Class IV, GMO Foreign Fund	Class IV	70	^[1]	234	411	925

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund typically makes equity investments directly and indirectly (e.g., through underlying funds or derivatives) in companies tied economically to non-U.S. countries, including companies that issue equity investments included in the MSCI international developed country universe (the universe of securities from which the MSCI EAFE Index, a developed markets index, is constructed) and companies whose equity investments are traded in the securities markets of the world’s non-developed countries (“emerging countries”). The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments tied economically to countries outside the U.S. (see “Name Policies”).

• Country selection – The Fund’s country selections relative to its benchmark are determined by the Manager’s cumulative quantitative value score for each country together with the Manager’s evaluation of the country’s fundamentals. The Fund typically overweights or underweights (sometimes to a significant extent) its investment exposure in particular countries relative to the Fund’s benchmark.

• Stock selection – The Manager selects stocks using fundamental analysis that is informed by a disciplined quantitative screening process. The Manager analyzes companies for financial, operational and managerial strength and compares them to their global, regional and local industry peers. As part of the investment process, the Manager frequently meets with management and/or visits companies.

The Fund may hold up to 10% of its total assets in cash and cash equivalents to manage cash inflows and outflows as a result of shareholder purchases and redemptions. To the extent the Fund holds cash or cash equivalents to manage shareholder purchases or redemptions, it may not achieve its investment objective. The Fund typically makes investments tied economically to emerging countries, but these investments generally represent 10% or less of the Fund’s total assets. In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (“OTC”) derivatives, including, without limitation, futures and options. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Information on the Fund’s return after taxes is unavailable prior to June 28, 1996, the date the Fund commenced operations as a registered investment company. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 21.67% (2Q2009)

Lowest Quarter: -19.12% (3Q2008)

Year-to-Date (as of 3/31/11): 3.95%

Average Annual Total Returns Periods Ending December 31, 2010

^[8]

Average Annual Total Returns GMO FOREIGN FUND	Column		Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.		Inception Date
Return Before Taxes Class II, GMO Foreign Fund	Class II		Return Before Taxes		4.62%	1.51%	5.92%	7.45%		Sep. 30, 1996
Return Before Taxes Class III, GMO Foreign Fund	Class III	^[1]	Return Before Taxes		4.77%	1.60%	6.00%	12.68%		Aug. 31, 1984
Return Before Taxes Class IV, GMO Foreign Fund	Class IV		Return Before Taxes		4.82%	1.63%	6.06%	7.42%		Jan. 09, 1998
Return After Taxes on Distributions Class III, GMO Foreign Fund	Class III	^[1]	Return After Taxes on Distributions		4.58%	0.62%	5.16%		^[2]	Aug. 31, 1984
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Foreign Fund	Class III	^[1]	Return After Taxes on Distributions and Sale of Fund Shares		3.60%	1.46%	5.22%		^[2]	Aug. 31, 1984
MSCI EAFE Index Class II, GMO Foreign Fund	Class II		MSCI EAFE Index	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	4.64%		Sep. 30, 1996
MSCI EAFE Index Class III, GMO Foreign Fund	Class III	^[1]	MSCI EAFE Index	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	9.76%		Aug. 31, 1984
MSCI EAFE Index Class IV, GMO Foreign Fund	Class IV		MSCI EAFE Index	(returns reflect no deduction of fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	5.05%		Jan. 09, 1998

[1]

Performance of Class III shares prior to June 28, 1996 is that of the private investment pool and reflects the pool's higher annual operating expenses. The pool was not registered as an investment company and therefore was not subject to restrictions imposed on the Fund by the Investment Company Act of 1940 and the Internal Revenue Code of 1986. Had the pool been subject to these restrictions, its performance may have been adversely affected.

[2]

Information on the Fund's return after taxes is unavailable prior to June 28, 1996, the date the Fund commenced operations as a registered investment company. Prior to that date, the Fund operated as a private investment pool with investment objectives, policies, and guidelines that were substantially the same as those of the Fund.

GMO FOREIGN SMALL COMPANIES FUND

Investment objective

Total return in excess of that of its benchmark, the S&P Developed ex-U.S. Small Cap Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees GMO FOREIGN SMALL COMPANIES FUND	Class III, GMO Foreign Small Companies Fund	Class IV, GMO Foreign Small Companies Fund
Shareholder Fees Column [Text]	Class III	Class IV
Purchase premium (as a percentage of amount invested)	0.50%	0.50%
Redemption fee (as a percentage of amount redeemed)	0.50%	0.50%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO FOREIGN SMALL COMPANIES FUND		Class III, GMO Foreign Small Companies Fund	Class IV, GMO Foreign Small Companies Fund
Operating Expenses Column [Text]		Class III	Class IV
Management fee		0.70%	0.70%
Shareholder service fee		0.15%	0.10%
Other expenses		0.14%	0.14%
Total annual operating expenses		0.99%	0.94%
Expense reimbursement	^[1]	(0.14%)	(0.14%)
Total annual operating expenses after expense reimbursement		0.85%	0.80%

[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO FOREIGN SMALL COMPANIES FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Foreign Small Companies Fund USD ($)		Class III	188	^[1]	406	641	1,318		Class III	136	^[1]	350	581	1,244
Class IV, GMO Foreign Small Companies Fund USD ($)		Class IV	183	^[1]	390	615	1,260		Class IV	131	^[1]	334	554	1,186

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund typically makes equity investments directly and indirectly (e.g., through underlying funds or derivatives) in companies tied economically to countries other than the U.S. whose outstanding publicly traded equities are in the lowest 25% of available market capitalization (float) in a particular country (“small companies”). The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in securities of small companies that are tied economically to countries outside the U.S. (see “Name Policies”). The market capitalization range of companies whose equity investments are held by the Fund is generally within the market capitalization range of companies in the Fund’s benchmark, which represents the lowest 15% of available market capitalization (float) of the S&P Broad Market Index in each country. Depending on the country, as of May 31, 2011, the market capitalization of the outstanding common stock and other stock-related securities of the largest company (in a particular country) included in the S&P Developed ex-U.S. Small Cap Index ranged from approximately $563 million (Greece) to $15.8 billion (Germany). Depending upon the country, as of May 31, 2011, the market capitalization of the outstanding common stock and other stock-related securities of the largest company (in a particular country) included within the Fund’s definition of small companies ranged from approximately $772 million (Greece) to $22 billion (Switzerland) (based on exchange rates as of May 31, 2011).

The Fund may hold up to 10% of its total assets in cash and cash equivalents to manage cash inflows and outflows as a result of shareholder purchases and redemptions. To the extent the Fund holds cash or cash equivalents to manage shareholder purchases or redemptions, it may not achieve its investment objective. The Fund typically makes investments tied economically to emerging countries, but these investments (excluding investments in companies tied economically to emerging countries included in the Fund’s benchmark) generally represent 10% or less of the Fund’s total assets. In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter (“OTC”) derivatives, including, without limitation, futures and options. The Fund’s foreign currency exposure may differ from the currency exposure of its equity investments. In addition, the Fund may lend its portfolio securities.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Smaller Company Risk – Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of small companies often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalizations.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III, tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 31.25% (2Q2009)

Lowest Quarter: -24.05% (3Q2008)

Year-to-Date (as of 3/31/11): 3.94%

Average Annual Total Returns Periods Ending December 31, 2010

^[9]

Average Annual Total Returns GMO FOREIGN SMALL COMPANIES FUND	Column		Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.		Inception Date
Return Before Taxes Class III, GMO Foreign Small Companies Fund	Class III	^[1]	Return Before Taxes		23.59%	7.69%	13.59%	12.09%		Jan. 04, 1995
Return Before Taxes Class IV, GMO Foreign Small Companies Fund	Class IV	^[2]	Return Before Taxes		23.67%	7.71%		13.93%		Jun. 14, 2002
Return After Taxes on Distributions Class III, GMO Foreign Small Companies Fund	Class III	^[1]	Return After Taxes on Distributions		23.58%	5.66%	11.92%		^[3]	Jan. 04, 1995
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Foreign Small Companies Fund	Class III	^[1]	Return After Taxes on Distributions and Sale of Fund Shares		15.29%	6.21%	11.75%		^[3]	Jan. 04, 1995
S&P Developed ex-U.S. Small Cap Index Class III, GMO Foreign Small Companies Fund	Class III	^[1]	S&P Developed ex-U.S. Small Cap Index	(reflects no deduction for fees, expenses, or taxes)	21.96%	5.16%	9.28%	7.39%		Jan. 04, 1995
S&P Developed ex-U.S. Small Cap Index Class IV, GMO Foreign Small Companies Fund	Class IV	^[2]	S&P Developed ex-U.S. Small Cap Index	(reflects no deduction for fees, expenses, or taxes)	21.96%	5.16%		12.28%		Jun. 14, 2002

[1]	Performance of Class III shares prior to June 30, 2000 is that of the private investment pool, restated to reflect the Fund's higher annual operating expenses. The pool was not registered as an investment company and therefore was not subject to certain restrictions imposed on the Fund by the Investment Company Act of 1940 and the Internal Revenue Code of 1986. Had the pool been subject to these restrictions, its performance may have been adversely affected.
[2]	For the period from March 16, 2009 to August 12, 2009, no Class IV shares were outstanding. The returns shown in the table for that period are those of Class III shares, which have higher expenses.
[3]	Information on the Fund's return after taxes is unavailable prior to June 30, 2000, the date the Fund commenced operations as a registered investment company. Prior to that date, the Fund operated as a private investment pool with investment objectives, policies, and guidelines that were substantially the same as those of the Fund.

GMO EMERGING MARKETS FUND

Investment objective

Total return in excess of that of its benchmark, the S&P/IFCI Composite Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees GMO EMERGING MARKETS FUND	Class II, GMO Emerging Markets Fund		Class III, GMO Emerging Markets Fund		Class IV, GMO Emerging Markets Fund		Class V, GMO Emerging Markets Fund	Class VI, GMO Emerging Markets Fund
Shareholder Fees Column [Text]	Class II		Class III		Class IV		Class V	Class VI
Purchase premium (as a percentage of amount invested)	0.80%		0.80%		0.80%		0.80%	0.80%
Redemption fee (as a percentage of amount redeemed)	0.80%	^[1]	0.80%	^[1]	0.80%	^[1]	0.80%	0.80%

[1]

Applies only to shares acquired on or after June 1, 1995 (including shares acquired by reinvestment of dividends or other distribution). With respect to Class III shares purchased through third-party intermediaries and any shares acquired prior to March 27, 2002, the level of redemption fee charged by the Fund is 0.40%.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO EMERGING MARKETS FUND		Class II, GMO Emerging Markets Fund	Class III, GMO Emerging Markets Fund	Class IV, GMO Emerging Markets Fund	Class V, GMO Emerging Markets Fund	Class VI, GMO Emerging Markets Fund
Operating Expenses Column [Text]		Class II	Class III	Class IV	Class V	Class VI
Management fee		0.75%	0.75%	0.75%	0.75%	0.75%
Shareholder service fee		0.22%	0.15%	0.105%	0.085%	0.055%
Other expenses		0.13%	0.13%	0.13%	0.13%	0.13%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.01%	0.01%	0.01%	0.01%	0.01%
Total annual operating expenses		1.11%	1.04%	1.00%	0.98%	0.95%
Expense reimbursement	^[2]	(0.03%)	(0.01%)	(0.01%)	(0.04%)	(0.04%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		1.08%	1.03%	0.99%	0.94%	0.91%

[1]

These indirect expenses include commission fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of transaction fees) and indirect transaction fees were approximately 0.01% and less than 0.01%, respectively.

[2]

Subject to certain exclusions ("Excluded Fund Fees and Expenses"), Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed to reimburse each class of the Fund to the extent the class's total annual operating expenses exceed the following amounts of the class's average daily net assets: 0.95% for Class II shares, 0.90% for Class III shares, 0.85% for Class IV shares, 0.80% for Class V shares, and 0.77% for Class VI shares. Excluded Fund Fees and Expenses include underlying fund expenses, custodial fees, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. This expense limitation will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO EMERGING MARKETS FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class II, GMO Emerging Markets Fund USD ($)		Class II	272	^[1]	516	780	1,534		Class II	189	^[1]	427	684	1,418
Class III, GMO Emerging Markets Fund USD ($)		Class III	267	^[1]	496	745	1,457		Class III	184	^[1]	407	648	1,340
Class IV, GMO Emerging Markets Fund USD ($)		Class IV	263	^[1]	484	724	1,411		Class IV	180	^[1]	395	627	1,294
Class V, GMO Emerging Markets Fund USD ($)		Class V	258	^[1]	475	710	1,386		Class V	175	^[1]	386	613	1,268
Class VI, GMO Emerging Markets Fund USD ($)		Class VI	255	^[1]	466	694	1,352		Class VI	172	^[1]	376	597	1,233

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund typically makes equity investments directly and indirectly (e.g., through underlying funds or derivatives) in companies tied economically to emerging markets. “Emerging markets” include all markets that are not treated as “developed markets” in the MSCI World Index or MSCI EAFE Index. The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments tied economically to emerging markets (see “Name Policies”). In addition to investing in companies tied economically to emerging markets, the Fund may invest in companies that the Manager believes are likely to benefit from growth in the emerging markets.

The Manager uses proprietary quantitative techniques and fundamental analysis to evaluate and select countries, sectors and equity investments.

As a substitute for direct investments in equities, the Manager may use exchange-traded and over-the-counter (“OTC”) derivatives and exchange-traded funds (“ETFs”). The Manager also may use derivatives and ETFs: (i) in an attempt to reduce investment exposures (which may result in a reduction below zero); (ii) in an attempt to adjust elements of the Fund’s investment exposure; and (iii) to effect transactions intended as substitutes for securities lending. Derivatives used may include options, futures, warrants, swap contracts and reverse repurchase agreements. The Fund’s foreign currency exposure may differ from the currency exposure represented by its equity investments. In addition, the Fund may take active overweighted and underweighted positions in particular currencies relative to its benchmark. In addition, the Fund may lend its portfolio securities.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging markets, the economies of which tend to be more volatile than the economies of developed markets.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in a limited number of countries and geographic regions creates additional risk.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in underlying funds, including the risk that the underlying funds (including ETFs) in which it invests will not perform as expected.

• Leveraging Risk – The Fund’s use of reverse repurchase agreements and other derivatives and securities lending may cause its portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 31.90% (2Q2009)

Lowest Quarter: -30.50% (4Q2008)

Year-to-Date (as of 3/31/11): 4.49%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO EMERGING MARKETS FUND	Column		Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes Class II, GMO Emerging Markets Fund	Class II	^[1]	Return Before Taxes		18.55%	9.91%	18.18%	11.80%	Nov. 29, 1996
Return Before Taxes Class III, GMO Emerging Markets Fund	Class III		Return Before Taxes		18.59%	9.98%	18.28%	10.60%	Dec. 09, 1993
Return Before Taxes Class IV, GMO Emerging Markets Fund	Class IV		Return Before Taxes		18.67%	10.03%	18.33%	13.92%	Jan. 09, 1998
Return Before Taxes Class V, GMO Emerging Markets Fund	Class V	^[2]	Return Before Taxes		18.78%	10.07%		20.37%	Aug. 04, 2003
Return Before Taxes Class VI, GMO Emerging Markets Fund	Class VI		Return Before Taxes		18.77%	10.10%		20.77%	Jun. 30, 2003
Return After Taxes on Distributions Class III, GMO Emerging Markets Fund	Class III		Return After Taxes on Distributions		18.69%	7.30%	16.21%	9.00%	Dec. 09, 1993
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Emerging Markets Fund	Class III		Return After Taxes on Distributions and Sale of Fund Shares		12.01%	8.15%	16.06%	8.96%	Dec. 09, 1993
S&P/IFCI Composite Index Class II, GMO Emerging Markets Fund	Class II	^[1]	S&P/IFCI Composite Index	(reflects no deduction for fees, expenses, or taxes)	20.64%	13.87%	17.68%	10.11%	Nov. 29, 1996
S&P/IFCI Composite Index Class III, GMO Emerging Markets Fund	Class III		S&P/IFCI Composite Index	(reflects no deduction for fees, expenses, or taxes)	20.64%	13.87%	17.68%	8.12%	Dec. 09, 1993
S&P/IFCI Composite Index Class IV, GMO Emerging Markets Fund	Class IV		S&P/IFCI Composite Index	(reflects no deduction for fees, expenses, or taxes)	20.64%	13.87%	17.68%	13.29%	Jan. 09, 1998
S&P/IFCI Composite Index Class V, GMO Emerging Markets Fund	Class V	^[2]	S&P/IFCI Composite Index	(reflects no deduction for fees, expenses, or taxes)	20.64%	13.87%		21.47%	Aug. 04, 2003
S&P/IFCI Composite Index Class VI, GMO Emerging Markets Fund	Class VI		S&P/IFCI Composite Index	(reflects no deduction for fees, expenses, or taxes)	20.64%	13.87%		22.03%	Jun. 30, 2003

[1]

For the period from January 9, 1998 to August 12, 2009, no Class II shares were outstanding. The returns shown in the table for that period are those of Class III shares, which have been adjusted downward to reflect Class II's higher total annual operating expenses (Class II's expenses during these periods were calculated by adjusting Class III's actual total annual operating expenses during such periods upward by the current differential between "Total annual operating expenses" for Class II and Class III shares shown in the Fund's "Annual Fund operating expenses" table).

[2]

For the period from October 26, 2004 to February 11, 2005, no Class V shares were outstanding. The returns shown in the table for that period are those of Class IV shares, which have higher expenses.

GMO EMERGING COUNTRIES FUND

Investment objective

Total return in excess of that of its benchmark, the S&P/IFCI Composite Index.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO EMERGING COUNTRIES FUND Class III, GMO Emerging Countries Fund
Operating Expenses Column [Text]		Class III
Management fee		0.65%
Shareholder service fee		0.15%
Other expenses		0.50%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.02%
Total annual operating expenses		1.32%
Expense reimbursement	^[2]	(0.15%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		1.17%

[1]

[2]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO EMERGING COUNTRIES FUND Class III, GMO Emerging Countries Fund	Class III	119	^[1]	404	709	1,577

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund typically makes equity investments directly and indirectly (e.g., through underlying funds or derivatives) in companies tied economically to emerging countries. “Emerging countries” include all countries that are not treated as “developed market countries” in the MSCI World Index or MSCI EAFE Index. The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments tied economically to emerging countries (see “Name Policies”). In addition to investing in companies tied economically to emerging countries, the Fund may invest in companies that the Manager believes are likely to benefit from growth in the emerging markets.

The Manager uses proprietary quantitative techniques and fundamental analysis to evaluate and select countries, sectors and equity investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in a limited number of countries and geographic regions creates additional risk.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 31.14% (2Q2009)

Lowest Quarter: -31.38% (4Q2008)

Year-to-Date (as of 3/31/11): 4.63%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO EMERGING COUNTRIES FUND Class III, GMO Emerging Countries Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		20.47%	10.23%	17.59%	11.64%	Aug. 29, 1997
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		20.59%	7.33%	15.28%	9.85%	Aug. 29, 1997
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		13.88%	8.44%	15.35%	9.97%	Aug. 29, 1997
S&P/IFCI Composite Index	Class III	S&P/IFCI Composite Index	(reflects no deduction for fees, expenses, or taxes)	20.64%	13.87%	17.68%	10.48%	Aug. 29, 1997

GMO EMERGING DOMESTIC OPPORTUNITIES FUND

Investment objective

Total return.

Fees and expenses

The tables below describe the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees GMO EMERGING DOMESTIC OPPORTUNITIES FUND	Class II, GMO Emerging Domestic Opportunities Fund	Class III, GMO Emerging Domestic Opportunities Fund	Class IV, GMO Emerging Domestic Opportunities Fund	Class V, GMO Emerging Domestic Opportunities Fund	Class VI, GMO Emerging Domestic Opportunities Fund
Shareholder Fees Column [Text]	Class II	Class III	Class IV	Class V	Class VI
Purchase premium (as a percentage of amount invested)	0.80%	0.80%	0.80%	0.80%	0.80%
Redemption fee (as a percentage of amount redeemed)	0.80%	0.80%	0.80%	0.80%	0.80%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO EMERGING DOMESTIC OPPORTUNITIES FUND		Class II, GMO Emerging Domestic Opportunities Fund	Class III, GMO Emerging Domestic Opportunities Fund	Class IV, GMO Emerging Domestic Opportunities Fund	Class V, GMO Emerging Domestic Opportunities Fund	Class VI, GMO Emerging Domestic Opportunities Fund
Operating Expenses Column [Text]		Class II	Class III	Class IV	Class V	Class VI
Management fee		0.75%	0.75%	0.75%	0.75%	0.75%
Shareholder service fee		0.22%	0.15%	0.105%	0.085%	0.055%
Other expenses	^[1]	3.55%	3.55%	3.55%	3.55%	3.55%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.01%	0.01%	0.01%	0.01%	0.01%
Total annual operating expenses	^[1]	4.53%	4.46%	4.42%	4.40%	4.37%
Expense reimbursement	^[1][2]	(3.45%)	(3.45%)	(3.45%)	(3.45%)	(3.45%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)	^[1]	1.08%	1.01%	0.97%	0.95%	0.92%

[1]

The amounts represent an annualized estimate of the Fund's operating expenses for its initial fiscal year.

[2]

Subject to certain exclusions ("Excluded Fund Fees and Expenses"), Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.75% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, all of a portion of the Fund's custodial fee (up to 10% per annum), independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. This expense limitation will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO EMERGING DOMESTIC OPPORTUNITIES FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year	3 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year	3 Years
GMO Trust	If you sell your shares				If you do not sell your shares
Class II, GMO Emerging Domestic Opportunities Fund USD ($)		Class II	610	1,518		Class II	530	1,438
Class III, GMO Emerging Domestic Opportunities Fund USD ($)		Class III	603	1,499		Class III	524	1,418
Class IV, GMO Emerging Domestic Opportunities Fund USD ($)		Class IV	600	1,488		Class IV	520	1,407
Class V, GMO Emerging Domestic Opportunities Fund USD ($)		Class V	598	1,482		Class V	518	1,401
Class VI, GMO Emerging Domestic Opportunities Fund USD ($)		Class VI	596	1,474		Class VI	515	1,393

Portfolio Turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. Because the Fund had not commenced operations as of the fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate is not available.

Principal Investment Strategies

The Fund typically makes equity investments directly and indirectly (e.g., through underlying funds or derivatives) in companies whose prospects are linked to the internal (“domestic”) development and growth of the world's non-developed markets (“emerging markets”), including companies that provide goods and services to emerging market consumers. “Emerging markets” include all markets that are not treated as “developed markets” in the MSCI World Index or MSCI EAFE Index.

The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments related to emerging markets (see “Name Policy”). The Fund’s investments are not limited to investments in companies located in any particular country or geographic region, and may include investments in companies located in developed markets (e.g., the U.S.) that are related to, or whose prospects are linked to, emerging markets. The Fund does not control risk relative to the MSCI Emerging Markets (EM) Index or any other securities index.

The Manager uses fundamental analysis to evaluate and select countries, sectors and companies that it believes are most likely to benefit from domestic growth in emerging markets. In evaluating and selecting investments, the Manager may consider many factors, including the Manager’s assessment of a country’s and/or sector’s fundamentals or growth prospects as well as a company’s positioning relative to its competitors.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal Risks of Investing in the Fund

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments related to emerging markets, the economies of which tend to be more volatile than the economies of developed markets.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Liquidity Risk – Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent the Fund from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Focused Investment Risk – The Fund’s investments in companies whose prospects are linked to the internal development and growth of emerging markets create additional risk because the performance of those companies is likely to be highly correlated.

The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations. The Fund is also subject to risk because the Fund does not seek to control risk relative to a particular securities market index or benchmark.

Performance

Because the Fund had not yet completed a full calendar year of operations as of the date of this Prospectus, performance information for the Fund is not included.

GMO TAIWAN FUND

Investment objective

Total return in excess of that of its benchmark, the MSCI Taiwan Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO TAIWAN FUND Class III, GMO Taiwan Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.15%
Redemption fee (as a percentage of amount redeemed)	0.45%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO TAIWAN FUND Class III, GMO Taiwan Fund
Operating Expenses Column [Text]		Class III
Management fee		0.81%
Shareholder service fee		0.15%
Other expenses		0.37%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.02%
Total annual fund operating expenses (Fund and underlying fund expenses)		1.35%

[1]	These indirect expenses include commission fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of transaction fees) and indirect transaction fees were 0.01% and 0.01%, respectively.

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO TAIWAN FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Taiwan Fund USD ($)		Class III	199	^[1]	492	807	1,701		Class III	152	^[1]	442	753	1,636

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund typically makes equity investments directly and indirectly (e.g., through underlying funds or derivatives) in companies doing business in, or otherwise tied economically to, Taiwan. The Fund may invest in companies of any market capitalization. The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in investments tied economically to Taiwan (see “Name Policies”).

The Manager uses proprietary quantitative techniques and fundamental analysis to evaluate and select sectors and equity investments. In evaluating and selecting investments, the Manager may consider many factors, including the Manager’s assessment of a sector’s fundamentals as well as a company’s positioning relative to its competitors.

The Fund may invest a significant portion of its assets in securities of issuers in industries with high positive correlations to one another (e.g., different industries within broad sectors, such as technology or financial services).

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. Because the Fund normally does not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries. Certain characteristics of Taiwan’s economy and geographic location also subject the Fund to risks. For example, Taiwan is a small island state with few raw material resources and limited land area and thus it relies heavily on imports for its commodity needs. Any fluctuations or shortages in the commodity markets could have a negative impact on the Taiwanese economy. Also, rising labor costs and increasing environmental consciousness have led some labor-intensive industries to relocate to countries with cheaper work forces, and continued labor outsourcing may adversely affect the Taiwanese economy. Taiwan’s economy also is intricately linked with economies of other Asian countries, which, like emerging market economies, often experience over-extensions of credit, frequent and pronounced currency fluctuations, devaluations and restrictions, rising unemployment and fluctuations in inflation. Currency devaluations in any one country can have a significant effect on the entire region. Political and social unrest in Asian countries could cause further economic and market uncertainty in Taiwan. In particular, the Taiwanese economy is dependent on the economies of Japan and China, and also the United States, and a reduction in purchases by any of them of Taiwanese products and services or negative changes in their economies would likely have an adverse impact on the Taiwanese economy. Taiwan’s geographic proximity to the People’s Republic of China and Taiwan’s history of political contention with China have resulted in ongoing tensions with China, including the continual risk of war with China. These tensions may materially affect the Taiwanese economy and securities markets. All of these risks could reduce the value of an investment in Taiwan Fund.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies with high positive correlations to one another, such as the Fund’s investments tied economically to Taiwan, creates additional risk.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in underlying funds, including the risk that the underlying funds in which it invests will not perform as expected.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 22.85% (3Q2010)

Lowest Quarter: -23.74% (4Q2008)

Year-to-Date (as of 3/31/11): -0.04%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO TAIWAN FUND Class III, GMO Taiwan Fund	Column	Label		Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Inception	Inception Date
Return Before Taxes	Class III	Return Before Taxes			24.09%	8.44%	11.12%	Oct. 04, 2002
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions	^[1]		23.80%	6.56%	9.72%	Oct. 04, 2002
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares	^[1]		15.76%	6.82%	9.47%	Oct. 04, 2002
MSCI Taiwan Index	Class III	MSCI Taiwan Index		(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	21.84%	8.74%	13.15%	Oct. 04, 2002

[1]	For periods prior to the public offering of the Fund's shares, which began on October 29, 2009, the Fund's after-tax returns reflect dividends that included certain non-deductible investment expenses.

GMO FLEXIBLE EQUITIES FUND

Investment objective

Total return in excess of that of its benchmark, the MSCI World Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO FLEXIBLE EQUITIES FUND		Class III, GMO Flexible Equities Fund	Class VI, GMO Flexible Equities Fund
Operating Expenses Column [Text]		Class III	Class VI
Management fee		0.55%	0.55%
Shareholder service fee		0.15%	0.055%
Other expenses		0.11%	0.11%
Total annual operating expenses		0.81%	0.72%
Expense reimbursement	^[1]	(0.11%)	(0.11%)
Total annual operating expenses after expense reimbursement		0.70%	0.61%

[1]

Example

Expense Example GMO FLEXIBLE EQUITIES FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Flexible Equities Fund	Class III	72	^[1]	248	439	991
Class VI, GMO Flexible Equities Fund	Class VI	62	^[1]	219	390	884

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund may invest directly and indirectly (e.g., through underlying funds or derivatives) in equity investments traded in any of the world’s securities markets. Under normal circumstances, the Fund invests directly and indirectly at least 80% of its assets in equity investments (see “Name Policies”). The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts. The Fund is permitted to make equity investments of all types, including equity investments issued by foreign and/or U.S. companies, growth and/or value style equities, and equity investments of companies of any market capitalization. In addition, the Fund is not limited in how much it may invest in any market or in the types of equity investments it may pursue, and it may often invest all its assets in a limited number of equity investments of companies in a single country and/or capitalization range. The Fund could experience material losses from a single investment. As of the date of this Prospectus, substantially all of the Fund’s assets were invested in equity investments tied economically to Japan.

The Manager pursues the Fund’s investment objective by using investment strategies designed to complement broader asset allocation strategies being implemented by the Manager in other Asset Allocation Funds or accounts. Accordingly, the Fund is not a standalone investment. The Manager uses multi-year forecasts of relative value and risk to determine the Fund’s strategic direction.

As a substitute for direct investments in equities, the Manager may use exchange-traded and over-the-counter (“OTC”) derivatives. The Manager also may use derivatives: (i) in an attempt to reduce investment exposures (which may result in a reduction below zero); (ii) in an attempt to adjust elements of the Fund’s investment exposure; and (iii) to effect transactions intended as substitutes for securities lending. Derivatives used may include options, futures, swap contracts and reverse repurchase agreements. The Fund’s foreign currency exposure may differ significantly from the currency exposure represented by its equity investments. For investment and hedging purposes, the Fund also may make short sales of securities, including short sales of securities the Fund does not own. In addition, the Fund may take active overweighted and underweighted positions in particular currencies relative to its benchmark. In addition, the Fund may lend its portfolio securities.

The Fund may identify and measure its performance against one or more secondary benchmarks from time to time. The Fund does not seek to control risk relative to the MSCI World Index or any other benchmark.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies with high positive correlations to one another creates additional risk. As noted above, as of the date of this Prospectus, substantially all of the Fund’s assets were invested in equity investments tied economically to Japan.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Short Sales Risk – The Fund runs the risk that the Fund’s loss on a short sale of securities that the Fund does not own is unlimited.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing the Fund’s annual total return for the period indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 20.74% (2Q2009)

Lowest Quarter: -24.04% (1Q2009)

Year-to-Date (as of 3/31/11): -0.65%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO FLEXIBLE EQUITIES FUND	Column	Label		Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	Incept.	Inception Date
Return Before Taxes Class III, GMO Flexible Equities Fund	Class III	Return Before Taxes			2.22%	(1.66%)	Dec. 12, 2008
Return Before Taxes Class VI, GMO Flexible Equities Fund	Class VI	Return Before Taxes			2.27%	(1.56%)	Dec. 12, 2008
Return After Taxes on Distributions Class III, GMO Flexible Equities Fund	Class III	Return After Taxes on Distributions	^[1]		2.13%	(1.88%)	Dec. 12, 2008
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Flexible Equities Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares	^[1]		1.81%	(1.37%)	Dec. 12, 2008
MSCI World Index Class III, GMO Flexible Equities Fund	Class III	MSCI World Index		(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.76%	22.29%	Dec. 12, 2008
MSCI World Index Class VI, GMO Flexible Equities Fund	Class VI	MSCI World Index		(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.76%	22.29%	Dec. 12, 2008

[1]	For periods prior to the public offering of the Fund's shares, which began on October 29, 2009, the Fund's after-tax returns reflect dividends that included certain non-deductible investment expenses.

GMO CURRENCY HEDGED INTERNATIONAL EQUITY FUND

Investment objective

Total return greater than that of its benchmark, the MSCI EAFE Index (Hedged).

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO CURRENCY HEDGED INTERNATIONAL EQUITY FUND Class III, GMO Currency Hedged International Equity Fund
Operating Expenses Column [Text]		Class III
Management fee		0.54%
Shareholder service fee	^[1]	0.15%
Other expenses		0.08%
Acquired fund fees and expenses (underlying fund expenses)		0.58%
Total annual operating expenses		1.35%
Expense reimbursement/waiver	^[1]	(0.65%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.70%

[1]

Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by the Fund exceeds 0.15%; provided, however, that the amount of this waiver will not exceed 0.15%. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.54% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.54% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO CURRENCY HEDGED INTERNATIONAL EQUITY FUND Class III, GMO Currency Hedged International Equity Fund	Class III	72	^[1]	374	699	1,619

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in other GMO Funds. The Fund may invest in International Core Equity Fund, International Intrinsic Value Fund, International Growth Equity Fund, International Small Companies Fund and Flexible Equities Fund (collectively, the “underlying Funds”). In addition, the Fund may invest in securities directly. Under normal circumstances, the Fund invests directly and indirectly (through investment in the underlying Funds) at least 80% of its assets in equity investments (see “Name Policies”). The term “equity investments” refers to direct and indirect investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

The Manager uses multi-year forecasts of relative value and risk among major sectors in the international equity markets (e.g., large-cap value, large-cap growth, large-cap core, small- and mid-cap value and small- and mid-cap growth) to select the underlying Funds and decide how much to invest in each. The Manager shifts investments among the underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund’s investments.

The Manager assesses the currency exposure of the underlying Funds’ holdings and then attempts to hedge at least 70% of that exposure relative to the U.S. dollar through the use of currency forwards and other derivatives. While the Fund’s benchmark is fully hedged, the Fund may take active overweighted and underweighted positions in particular currencies relative to its benchmark.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds. The Fund also may lend its portfolio securities.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund’s investments in the underlying Funds. The Fund and some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund or an underlying Fund may affect the Fund’s or the underlying Fund’s performance more than if the Fund or underlying Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund or an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. The Fund or an underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund and the underlying Funds normally do not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in the underlying Funds, including the risk that the underlying Funds in which it invests will not perform as expected. Because the Fund bears the fees and expenses of the underlying Funds in which it invests, new investments in underlying Funds with higher fees or expenses than those of the underlying Funds in which the Fund is currently invested will increase the Fund’s total expenses. The fees and expenses associated with an investment in the Fund are less predictable and may be higher than fees and expenses associated with an investment in funds that charge a fixed management fee.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies, or that the U.S. dollar will decline in value relative to the foreign currency being hedged by the Fund or an underlying Fund.

• Leveraging Risk – The use of derivatives and securities lending may cause the Fund’s portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of investments decline.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark and an additional broad-based international stock index selected by the Manager. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 16.08% (2Q2003)

Lowest Quarter: -15.63% (3Q2002)

Year-to-Date (as of 3/31/11): 0.43%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO CURRENCY HEDGED INTERNATIONAL EQUITY FUND Class III, GMO Currency Hedged International Equity Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		7.72%	0.81%	4.10%	7.65%	Jun. 30, 1995
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		7.72%	(2.90%)	0.90%	3.56%	Jun. 30, 1995
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		5.02%	3.99%	4.46%	6.06%	Jun. 30, 1995
MSCI EAFE Index (Hedged) (Fund benchmark)	Class III	MSCI EAFE Index (Hedged) (Fund benchmark)	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	5.60%	0.07%	0.59%	5.97%	Jun. 30, 1995
MSCI EAFE Index	Class III	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	2.46%	3.50%	5.09%	Jun. 30, 1995

GMO DOMESTIC BOND FUND

Investment objective

Total return in excess of that of its benchmark, the Barclays Capital U.S. Government Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO DOMESTIC BOND FUND		Class III, GMO Domestic Bond Fund	Class VI, GMO Domestic Bond Fund
Operating Expenses Column [Text]		Class III	Class VI
Management fee	^[1]	0.10%	0.10%
Shareholder service fee	^[1]	0.15%	0.055%
Other expenses		0.03%	0.03%
Acquired fund fees and expenses (underlying fund expenses)	^[2]	0.01%	0.01%
Total annual operating expenses		0.29%	0.20%
Expense reimbursement/waiver	^[1]	(0.03%)	(0.03%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.26%	0.17%

[1]

Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by a class of shares of the Fund exceeds the applicable shareholder service fee set forth in the table above; provided, however, that the amount of this waiver will not exceed the applicable shareholder service fee set forth in the table above. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.10% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its direct or indirect investment in U.S. Treasury Fund (excluding U.S. Treasury Fund's Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.10% of the Fund's average daily net assets. These contractual expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

[2]

The amounts have been restated to reflect current fees of certain underlying funds.

Example

Expense Example GMO DOMESTIC BOND FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Domestic Bond Fund	Class III	27	^[1]	95	169	388
Class VI, GMO Domestic Bond Fund	Class VI	17	^[1]	64	114	264

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 8% of the average value of its portfolio.

Principal investment strategies

The Fund is not currently pursuing its investment objective or an active investment program and is not acquiring new investments.

Historically, the Fund has implemented its strategies: (i) synthetically by using exchange-traded and over-the-counter (“OTC”) derivatives and investing in other GMO Funds and/or (ii) directly by purchasing bonds. The Fund principally holds shares of Short-Duration Collateral Fund (“SDCF”) (a Fund that primarily holds U.S. asset-backed securities).

The Fund has also invested in and may continue to hold:

• U.S. bonds (including U.S. government bonds, U.S. corporate bonds and asset-backed securities);

• derivatives, including without limitation, futures contracts, reverse repurchase agreements, credit default swaps and other swap contracts;

• shares of U.S. Treasury Fund (for cash management purposes); and

• foreign bonds.

Because of the deterioration in credit markets that became acute in 2008, the Fund, including through its investment in SDCF, currently has and is expected to continue to have material exposure to below investment grade U.S. asset-backed securities (also known as “junk bonds”). The Fund is not limited in its use of derivatives or in the absolute face value of its derivatives positions, and, as a result, the Fund may be leveraged in relation to its assets.

The Manager does not seek to maintain a specified interest rate duration for the Fund.

Under normal circumstances, the Fund invests directly and indirectly (e.g., through other GMO Funds or derivatives) at least 80% of its assets in bonds tied economically to the U.S. (see “Name Policies”). The term “bond” includes (i) obligations of an issuer to make payments of principal and/or interest (whether fixed or variable) on future dates and (ii) synthetic debt instruments created by the Manager by using derivatives (e.g., a futures contract, swap contract, currency forward or option).

Principal risks of investing in the Fund

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer’s failure to meet its payment obligations or the market’s expectation of a default, which may result from the downgrading of the issuer’s credit rating. The Fund’s investments in below investment grade securities have speculative characteristics, and changes in economic conditions or other circumstances are more likely to impair the capacity of issuers to make principal and interest payments than is the case with issuers of investment grade securities.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies with high positive correlations to one another, such as the Fund’s investments in asset-backed securities secured by different types of consumer debt (e.g., credit-card receivables, automobile loans and home equity loans), creates additional risk.

• Market Risk – Fixed Income Securities – Typically, the market value of the Fund’s fixed income securities will decline during periods of widening of credit spreads.

• Derivatives Risk – The use of derivatives involves the risk that their value may or may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk, currency risk and counterparty risk.

• Counterparty Risk – The Fund runs the risk that the counterparty to an OTC derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations. The risk of counterparty default is particularly acute in economic environments in which financial services firms are exposed to systemic risks of the type evidenced by the insolvency of Lehman Brothers in 2008 and subsequent market disruptions.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 7.29% (3Q2009)

Lowest Quarter: -6.39% (4Q2008)

Year-to-Date (as of 3/31/11): 1.51%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO DOMESTIC BOND FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO Domestic Bond Fund	Class III	Return Before Taxes		9.06%	5.39%	5.71%	6.54%	Aug. 18, 1994
Return Before Taxes Class VI, GMO Domestic Bond Fund	Class VI	Return Before Taxes		9.14%	5.47%		5.18%	Jul. 26, 2005
Return After Taxes on Distributions Class III, GMO Domestic Bond Fund	Class III	Return After Taxes on Distributions		8.64%	3.52%	3.78%	4.13%	Aug. 18, 1994
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Domestic Bond Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		5.88%	3.51%	3.63%	4.14%	Aug. 18, 1994
Barclays Capital U.S. Government Index Class III, GMO Domestic Bond Fund	Class III	Barclays Capital U.S. Government Index	(reflects no deduction for fees, expenses, or taxes)	5.52%	5.45%	5.42%	6.34%	Aug. 18, 1994
Barclays Capital U.S. Government Index Class VI, GMO Domestic Bond Fund	Class VI	Barclays Capital U.S. Government Index	(reflects no deduction for fees, expenses, or taxes)	5.52%	5.45%		5.16%	Jul. 26, 2005

GMO CORE PLUS BOND FUND

Investment objective

Total return in excess of that of its benchmark, the Barclays Capital U.S. Aggregate Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO CORE PLUS BOND FUND		Class III, GMO Core Plus Bond Fund	Class IV, GMO Core Plus Bond Fund
Operating Expenses Column [Text]		Class III	Class IV
Management fee		0.25%	0.25%
Shareholder service fee	^[1]	0.15%	0.10%
Other expenses	^[2]	0.13%	0.13%
Acquired fund fees and expenses (underlying fund expenses)	^[3]	0.04%	0.04%
Total annual operating expenses		0.57%	0.52%
Expense reimbursement/waiver	^[1]	(0.14%)	(0.14%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.43%	0.38%

[1]	Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by a class of shares of the Fund exceeds the applicable shareholder service fee set forth in the table above; provided, however, that the amount of this waiver will not exceed the applicable shareholder service fee set forth in the table above. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.
[2]	"Other expenses" have been restated to reflect current fees.
[3]	The amounts have been restated to reflect current fees of certain underlying funds. These indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees and as restated), indirect interest expense, and indirect transaction fees were 0.02%, 0.01%, and 0.01%, respectively.

Example

Expense Example GMO CORE PLUS BOND FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Core Plus Bond Fund	Class III	44	^[1]	173	313	723
Class IV, GMO Core Plus Bond Fund	Class IV	39	^[1]	157	286	662

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 46% of the average value of its portfolio.

Principal investment strategies

The Fund’s investment program has two principal components. One component seeks to replicate the Fund’s benchmark. The second component seeks to add value relative to the Fund’s benchmark by taking positions that may be unrelated to its benchmark in global interest rate, currency and credit markets (particularly in asset-backed and emerging country debt markets). These positions can cause the Fund’s performance to differ significantly from that of its benchmark.

In deciding on what positions to take in global interest rate and currency markets, and for the size of those positions, the Manager considers fundamental factors (e.g., inflation and current account positions) as well as price-based factors (e.g., interest and exchange rates). The Manager assesses the relative values across global interest rate and currency markets, and considers the merits of overweighting or underweighting positions in currencies and interest rates. The Manager also may consider the relative attractiveness of yield curve and duration positions in these markets.

In selecting credit investments, the Manager uses fundamental investment techniques to assess the expected performance of these investments relative to the Fund’s benchmark.

In implementing these strategies, the Fund may hold or invest in:

• derivatives, including without limitation, futures contracts, currency options, interest rate options, currency forwards, reverse repurchase agreements, credit default swaps and other swap contracts (to generate a return comparable to the Fund’s benchmark and to gain exposure to the global interest rate, credit and currency markets);

• bonds denominated in various currencies, including foreign and U.S. government bonds, asset-backed securities issued by foreign governments and U.S. government agencies (as well as bonds neither guaranteed nor insured by the U.S. government), corporate bonds, and mortgage-backed and other asset-backed securities issued by private issuers;

• shares of Short-Duration Collateral Fund (“SDCF”) (to have exposure to asset-backed securities);

• shares of World Opportunity Overlay Fund (“Overlay Fund”) (to gain exposure to the global interest rate, credit and currency markets);

• shares of Emerging Country Debt Fund (“ECDF”) (to gain exposure to emerging country debt markets);

• shares of U.S. Treasury Fund and unaffiliated money market funds (for cash management purposes);

• shares of High Quality Short-Duration Bond Fund (to seek to generate a return in excess of that of the J.P. Morgan U.S. 3 Month Cash Index by investing in a wide variety of high quality U.S. and foreign debt investments); and

• shares of Debt Opportunities Fund (to gain exposure to global credit markets).

The Fund, primarily through its investments in shares of SDCF, Overlay Fund and ECDF, has and is expected to continue to have material exposure to below investment grade U.S. asset-backed and emerging country debt securities. The Fund is not limited in its use of derivatives or in the absolute face value of its derivatives positions, and, as a result, the Fund may be leveraged in relation to its assets.

The Manager normally seeks to maintain the Fund’s estimated interest rate duration within +/- 2 years of the benchmark’s duration (approximately 5.2 years as of 05/31/11). For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Fixed Income Funds – Duration.”

Principal risks of investing in the Fund

• Market Risk – Fixed Income Securities – Typically, the market value of the Fund’s fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Derivatives Risk – The use of derivatives involves the risk that their value may or may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk, currency risk and counterparty risk.

• Counterparty Risk – The Fund runs the risk that the counterparty to an over-the-counter (OTC) derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations. The risk of counterparty default is particularly acute in economic environments in which financial services firms are exposed to systemic risks of the type evidenced by the insolvency of Lehman Brothers in 2008 and subsequent market disruptions.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 9.12% (3Q2009)

Lowest Quarter: -15.24% (4Q2008)

Year-to-Date (as of 3/31/11): 1.54%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO CORE PLUS BOND FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO Core Plus Bond Fund	Class III	Return Before Taxes		13.27%	2.91%	5.14%	5.62%	Apr. 30, 1997
Return Before Taxes Class IV, GMO Core Plus Bond Fund	Class IV	Return Before Taxes		13.31%	2.93%		3.08%	Jul. 26, 2005
Return After Taxes on Distributions Class III, GMO Core Plus Bond Fund	Class III	Return After Taxes on Distributions		10.56%	(0.60%)	2.19%	2.75%	Apr. 30, 1997
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Core Plus Bond Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		8.62%	0.36%	2.62%	3.08%	Apr. 30, 1997
Barclays Capital U.S. Aggregate Index Class III, GMO Core Plus Bond Fund	Class III	Barclays Capital U.S. Aggregate Index	(reflects no deduction for fees, expenses, or taxes)	6.54%	5.80%	5.84%	6.30%	Apr. 30, 1997
Barclays Capital U.S. Aggregate Index Class IV, GMO Core Plus Bond Fund	Class IV	Barclays Capital U.S. Aggregate Index	(reflects no deduction for fees, expenses, or taxes)	6.54%	5.80%		5.46%	Jul. 26, 2005

GMO INTERNATIONAL BOND FUND

Investment objective

Total return in excess of that of its benchmark, the J.P. Morgan Non-U.S. Government Bond Index.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO INTERNATIONAL BOND FUND Class III, GMO International Bond Fund
Operating Expenses Column [Text]		Class III
Management fee		0.25%
Shareholder service fee	^[1]	0.15%
Other expenses	^[2]	0.21%
Acquired fund fees and expenses (underlying fund expenses)	^[3]	0.07%
Total annual operating expenses		0.68%
Expense reimbursement/waiver	^[1]	(0.22%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.46%

[1]	Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by the Fund exceeds 0.15%; provided, however, that the amount of this waiver will not exceed 0.15%. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.
[2]	"Other expenses" have been restated to reflect current fees. The amount includes interest expense incurred by the Fund as a result of entering into reverse repurchase agreements. "Other expenses" (before addition of interest expense) and interest expense were 0.20% and 0.01%, respectively.
[3]	The amount has been restated to reflect current fees of certain underlying funds. These indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees and as restated), indirect interest expense, and indirect transaction fees were 0.03%, 0.01%, and 0.03%, respectively.

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO INTERNATIONAL BOND FUND Class III, GMO International Bond Fund	Class III	47	^[1]	200	366	848

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 46% of the average value of its portfolio.

Principal investment strategies

In selecting credit investments, the Manager uses fundamental investment techniques to assess the expected performance of these investments relative to the Fund’s benchmark.

In implementing these strategies, the Fund may hold or invest in:

• foreign bonds and other bonds denominated in various currencies, including foreign and U.S. government bonds, asset-backed securities issued by foreign governments and U.S. government agencies (as well as bonds neither guaranteed nor insured by the U.S. government), corporate bonds, and mortgage-backed and other asset-backed securities issued by private issuers;

• shares of Short-Duration Collateral Fund (“SDCF”) (to have exposure to asset-backed securities);

• shares of World Opportunity Overlay Fund (“Overlay Fund”) (to gain exposure to the global interest rate, credit and currency markets);

• shares of Emerging Country Debt Fund (“ECDF”) (to gain exposure to emerging country debt markets);

• shares of U.S. Treasury Fund and unaffiliated money market funds (for cash management purposes);

• shares of Debt Opportunities Fund (to gain exposure to global credit markets).

The Manager normally seeks to maintain the Fund’s estimated interest rate duration within +/- 2 years of the benchmark’s duration (approximately 6.9 years as of 05/31/11). For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Fixed Income Funds – Duration.”

Principal risks of investing in the Fund

•Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

•Market Risk – Fixed Income Securities – Typically, the market value of the Fund’s fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

•Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

•Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer’s failure to meet its payment obligations or the market’s expectation of a default, which may result from the downgrading of the issuer’s credit rating. The Fund’s investments in below investment grade securities have speculative characteristics, and changes in economic conditions or other circumstances are more likely to impair the capacity of issuers to make principal and interest payments than is the case with issuers of investment grade securities.

•Derivatives Risk – The use of derivatives involves the risk that their value may or may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk, currency risk and counterparty risk.

•Leveraging Risk – The Fund’s use of reverse repurchase agreements and other derivatives and securities lending may cause its portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

•Counterparty Risk – The Fund runs the risk that the counterparty to an over-the-counter (OTC) derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations. The risk of counterparty default is particularly acute in economic environments in which financial services firms are exposed to systemic risks of the type evidenced by the insolvency of Lehman Brothers in 2008 and subsequent market disruptions.

•Focused Investment Risk – Focusing investments in countries, regions, sectors or companies with high positive correlations to one another, such as the Fund’s investments in asset-backed securities secured by different types of consumer debt (e.g., credit-card receivables, automobile loans and home equity loans), creates additional risk.

•Management and Operational Risk – The Fund relies on GMO’s ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO’s proprietary investment techniques will fail to produce the desired results. The Fund’s portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

•Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in underlying funds, including the risk that the underlying funds in which it invests will not perform as expected.

•Market Disruption and Geopolitical Risk – Geopolitical and other events may disrupt securities markets and adversely affect global economies and markets. Those events as well as other changes in foreign and domestic economic and political conditions could adversely affect the value of the Fund’s investments.

•Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund’s operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 15.75% (2Q2002)

Lowest Quarter: -12.23% (4Q2008)

Year-to-Date (as of 3/31/11): 1.86%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO INTERNATIONAL BOND FUND Class III, GMO International Bond Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		14.03%	5.16%	6.99%	7.07%	Dec. 22, 1993
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		12.10%	1.22%	3.43%	3.78%	Dec. 22, 1993
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		9.09%	2.04%	3.86%	4.07%	Dec. 22, 1993
J.P. Morgan Non-U.S. Government Bond Index	Class III	J.P. Morgan Non-U.S. Government Bond Index	(reflects no deduction for fees, expenses, or taxes)	6.78%	8.01%	7.64%	6.41%	Dec. 22, 1993

GMO STRATEGIC FIXED INCOME FUND

Investment objective

Total return in excess of that of its benchmark, the J.P. Morgan U.S. 3 Month Cash Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO STRATEGIC FIXED INCOME FUND		Class III, GMO Strategic Fixed Income Fund	Class VI, GMO Strategic Fixed Income Fund
Operating Expenses Column [Text]		Class III	Class VI
Management fee		0.25%	0.25%
Shareholder service fee	^[1]	0.15%	0.055%
Other expenses		0.03%	0.03%
Acquired fund fees and expenses (underlying fund expenses)	^[2]	0.03%	0.03%
Total annual operating expenses		0.46%	0.37%
Expense reimbursement/waiver	^[1]	(0.04%)	(0.04%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.42%	0.33%

[1]

Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by a class of shares of the Fund exceeds the applicable shareholder service fee set forth in the table above; provided, however, that the amount of this waiver will not exceed the applicable shareholder service fee set forth in the table above. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

[2]

The amounts have been restated to reflect current fees of certain underlying funds. These indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees and as restated), indirect interest expense, and indirect transaction fees were approximately 0.02%, 0.01%, and less than 0.01%, respectively.

Example

Expense Example GMO STRATEGIC FIXED INCOME FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Strategic Fixed Income Fund	Class III	43	^[1]	150	267	609
Class VI, GMO Strategic Fixed Income Fund	Class VI	34	^[1]	119	213	487

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 19% of the average value of its portfolio.

Principal investment strategies

Under normal circumstances, the Fund invests directly and indirectly (e.g., through other GMO Funds or derivatives) at least 80% of its assets in fixed income securities (see “Name Policies”). The term “fixed income security” includes (i) obligations of an issuer to make payments of principal and/or interest (whether fixed or variable) on future dates and (ii) synthetic debt instruments created by the Manager by using derivatives (e.g., a futures contract, swap contract, currency forward or option). The Fund is permitted to invest in fixed income securities of any kind (e.g., fixed income securities of any maturity, duration or credit quality). The Fund may invest in any sector of the fixed income market and is not required to maintain a minimum or maximum allocation of investments in any one sector. The Fund may invest all of its assets in below investment grade securities (also known as “junk bonds”). The sectors and types of fixed income securities in which the Fund may invest or hold include, but are not limited to:

• investment grade bonds denominated in various currencies, including bonds issued by the U.S. and foreign governments and their agencies or instrumentalities (as well as bonds neither guaranteed nor insured by the U.S. government), corporate bonds and taxable and tax-exempt municipal bonds;

• below investment grade bonds;

• inflation indexed bonds issued by the U.S. government (including Inflation-Protected Securities issued by the U.S. Treasury (TIPS)) and foreign governments and their agencies or instrumentalities (as well as bonds neither guaranteed nor insured by the U.S. and/or foreign governments) and inflation indexed bonds issued by corporations;

• sovereign debt of emerging countries and other bonds issued in emerging countries (including below investment grade bonds); and

• asset-backed securities.

The Fund has substantial holdings of Short-Duration Collateral Fund (“SDCF”) (a Fund that primarily holds U.S. asset-backed securities) and World Opportunity Overlay Fund (“Overlay Fund”) (a Fund that invests in asset-backed securities and uses derivatives to attempt to exploit misvaluations in world interest rates, currencies and credit markets).

The Fund may also invest in exchange traded and over-the-counter (“OTC”) derivatives, including futures contracts, currency options, currency forwards, reverse repurchase agreements, swap contracts (including credit default swaps), interest rate options, swaps on interest rates and other types of derivatives. The Fund is not limited in its use of derivatives or in the absolute face value of its derivatives positions, and, as a result, the Fund may be leveraged in relation to its assets.

The Fund may gain exposure to the investments described above through investments in shares of other GMO Funds, including SDCF and Overlay Fund, and also Emerging Country Debt Fund (“ECDF”) (to gain exposure to emerging country debt markets), High Quality Short-Duration Bond Fund (to seek to generate a return in excess of that of the J.P. Morgan U.S. 3 Month Cash Index by investing in a wide variety of high quality U.S. and foreign debt investments), Debt Opportunities Fund (to gain exposure to global credit markets) and U.S. Treasury Fund (for cash management purposes). For cash management purposes, the Fund may invest in unaffiliated money market funds.

The Fund, primarily though its investments in SDCF, Overlay Fund and ECDF, has and is expected to continue to have material exposure to below investment grade U.S. asset-backed and emerging country debt securities.

The Manager does not seek to maintain a specified interest rate duration for the Fund, and the Fund’s interest rate duration will change depending on the Fund’s investments and the Manager’s assessment of different sectors of the bond market.

Principal risks of investing in the Fund

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Counterparty Risk – The Fund runs the risk that the counterparty to an OTC derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations. The risk of counterparty default is particularly acute in economic environments in which financial services firms are exposed to systemic risks of the type evidenced by the insolvency of Lehman Brothers in 2008 and subsequent market disruptions.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 8.76% (2Q2009)

Lowest Quarter: -17.50% (4Q2008)

Year-to-Date (as of 3/31/11): 2.05%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO STRATEGIC FIXED INCOME FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	Incept.	Inception Date
Return Before Taxes Class III, GMO Strategic Fixed Income Fund	Class III	Return Before Taxes		5.18%	1.45%	Jul. 13, 2006
Return Before Taxes Class VI, GMO Strategic Fixed Income Fund	Class VI	Return Before Taxes		5.22%	1.54%	May 31, 2006
Return After Taxes on Distributions Class III, GMO Strategic Fixed Income Fund	Class III	Return After Taxes on Distributions		3.96%	(0.10%)	Jul. 13, 2006
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Strategic Fixed Income Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		3.35%	0.31%	Jul. 13, 2006
J.P. Morgan U.S. 3 Month Cash Index Class III, GMO Strategic Fixed Income Fund	Class III	J.P. Morgan U.S. 3 Month Cash Index	(reflects no deduction for fees, expenses, or taxes)	0.45%	3.19%	Jul. 13, 2006
J.P. Morgan U.S. 3 Month Cash Index Class VI, GMO Strategic Fixed Income Fund	Class VI	J.P. Morgan U.S. 3 Month Cash Index	(reflects no deduction for fees, expenses, or taxes)	0.45%	3.24%	May 31, 2006

GMO CURRENCY HEDGED INTERNATIONAL BOND FUND

Investment objective

Total return in excess of that of its benchmark, the J.P. Morgan Non-U.S. Government Bond Index (Hedged) (ex-Japan).

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO CURRENCY HEDGED INTERNATIONAL BOND FUND Class III, GMO Currency Hedged International Bond Fund
Operating Expenses Column [Text]		Class III
Management fee		0.25%
Shareholder service fee	^[1]	0.15%
Other expenses	^[2]	0.25%
Acquired fund fees and expenses (underlying fund expenses)	^[3]	0.05%
Total annual operating expenses		0.70%
Expense reimbursement/waiver	^[1]	(0.26%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.44%

[1]	Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by the Fund exceeds 0.15%; provided, however, that the amount of this waiver will not exceed 0.15%. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.
[2]	"Other expenses" have been restated to reflect current fees.
[3]	The amount has been restated to reflect current fees of certain underlying funds. These indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees and as restated), indirect interest expense, and indirect transaction fees were 0.03%, 0.01%, and 0.01%, respectively.

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO CURRENCY HEDGED INTERNATIONAL BOND FUND Class III, GMO Currency Hedged International Bond Fund	Class III	45	^[1]	202	373	868

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 51% of the average value of its portfolio.

Principal investment strategies

In selecting credit investments, the Manager uses fundamental investment techniques to assess the expected performance of these investments relative to the Fund’s benchmark.

In implementing these strategies, the Fund may hold or invest in:

• shares of Short-Duration Collateral Fund (“SDCF”) (to have exposure to asset-backed securities);

• shares of World Opportunity Overlay Fund (“Overlay Fund”) (to gain exposure to the global interest rate, credit and currency markets);

• shares of Emerging Country Debt Fund (“ECDF”) (to gain exposure to emerging country debt markets);

• shares of U.S. Treasury Fund and unaffiliated money market funds (for cash management purposes);

• shares of Debt Opportunities Fund (to gain exposure to global credit markets).

The Fund generally attempts to hedge at least 75% of its net foreign currency exposure into U.S. dollars.

The Manager normally seeks to maintain the Fund’s estimated interest rate duration within +/- 2 years of the benchmark’s duration (approximately 6.6 years as of 05/31/11). For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Fixed Income Funds – Duration.”

Principal risks of investing in the Fund

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in underlying funds, including the risk that the underlying funds in which it invests will not perform as expected.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is a broad-based index) and a composite index computed by the Manager. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 8.23% (3Q2009)

Lowest Quarter: -11.09% (4Q2008)

Year-to-Date (as of 3/31/11): -0.37%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO CURRENCY HEDGED INTERNATIONAL BOND FUND Class III, GMO Currency Hedged International Bond Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		11.70%	2.44%	4.62%	8.02%	Sep. 30, 1994
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		9.94%	0.93%	2.37%	4.62%	Sep. 30, 1994
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		7.61%	1.19%	2.57%	4.79%	Sep. 30, 1994
J.P. Morgan Non-U.S. Government Bond Index (Hedged) (ex-Japan) (Fund benchmark)	Class III	J.P. Morgan Non-U.S. Government Bond Index (Hedged) (ex-Japan) (Fund benchmark)	(reflects no deduction for fees, expenses, or taxes)	3.71%	4.18%	5.03%	7.05%	Sep. 30, 1994
J.P. Morgan Non-U.S. Government Bond Index (Hedged) (ex-Japan) + (Composite index)	Class III	J.P. Morgan Non-U.S. Government Bond Index (Hedged) (ex-Japan) + (Composite index)		3.71%	4.18%	4.91%	7.11%	Sep. 30, 1994

GMO GLOBAL BOND FUND

Investment objective

Total return in excess of that of its benchmark, the J.P. Morgan Global Government Bond Index.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO GLOBAL BOND FUND Class III, GMO Global Bond Fund
Operating Expenses Column [Text]		Class III
Management fee		0.19%
Shareholder service fee	^[1]	0.15%
Other expenses	^[2]	0.12%
Acquired fund fees and expenses (underlying fund expenses)	^[3]	0.04%
Total annual operating expenses		0.50%
Expense reimbursement/waiver	^[1]	(0.07%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.43%

[1]	Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by the Fund exceeds 0.15%; provided, however, that the amount of this waiver will not exceed 0.15%. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.
[2]	The amount includes interest expense incurred by the Fund as a result of entering into reverse repurchase agreements. "Other expenses" (before addition of interest expense) and interest expense were 0.11% and 0.01%, respectively.
[3]	The amount has been restated to reflect current fees of certain underlying funds. These indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees and as restated), indirect interest expense, and indirect transaction fees were 0.02%, 0.01%, and 0.01%, respectively.

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO GLOBAL BOND FUND Class III, GMO Global Bond Fund	Class III	44	^[1]	160	286	655

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 45% of the average value of its portfolio.

Principal investment strategies

In selecting credit investments, the Manager uses fundamental investment techniques to assess the expected performance of these investments relative to the Fund’s benchmark.

In implementing these strategies, the Fund may hold or invest in:

• shares of Short-Duration Collateral Fund (“SDCF”) (to have exposure to asset-backed securities);

• shares of World Opportunity Overlay Fund (“Overlay Fund”) (to gain exposure to the global interest rate, credit and currency markets);

• shares of Emerging Country Debt Fund (“ECDF”) (to gain exposure to emerging country debt markets);

• shares of U.S. Treasury Fund and unaffiliated money market funds (for cash management purposes);

• shares of Debt Opportunities Fund (to gain exposure to global credit markets).

The Manager normally seeks to maintain the Fund’s estimated interest rate duration within +/- 2 years of the benchmark’s duration (approximately 6.4 years as of 05/31/11). For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Fixed Income Funds – Duration.”

Principal risks of investing in the Fund

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 13.28% (2Q2002)

Lowest Quarter: -12.70% (4Q2008)

Year-to-Date (as of 3/31/11): 1.67%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO GLOBAL BOND FUND Class III, GMO Global Bond Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		14.14%	5.27%	6.54%	6.19%	Dec. 28, 1995
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		11.10%	2.81%	3.37%	3.40%	Dec. 28, 1995
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		9.12%	3.04%	3.65%	3.58%	Dec. 28, 1995
J.P. Morgan Global Government Bond Index	Class III	J.P. Morgan Global Government Bond Index	(reflects no deduction for fees, expenses, or taxes)	6.42%	7.35%	7.12%	5.88%	Dec. 28, 1995

GMO EMERGING COUNTRY DEBT FUND

Investment objective

Total return in excess of that of its benchmark, the J.P. Morgan EMBI Global.

Fees and expenses

The tables below describe the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees GMO EMERGING COUNTRY DEBT FUND	Class III, GMO Emerging Country Debt Fund	Class IV, GMO Emerging Country Debt Fund
Shareholder Fees Column [Text]	Class III	Class IV
Purchase premium (as a percentage of amount invested)	0.50%	0.50%
Redemption fee (as a percentage of amount redeemed)	0.50%	0.50%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO EMERGING COUNTRY DEBT FUND		Class III, GMO Emerging Country Debt Fund	Class IV, GMO Emerging Country Debt Fund
Operating Expenses Column [Text]		Class III	Class IV
Management fee		0.35%	0.35%
Shareholder service fee	^[1]	0.15%	0.10%
Other expenses	^[2]	0.15%	0.15%
Total annual operating expenses		0.65%	0.60%

[1]

[2]

"Other expenses" have been restated to reflect current fees. The amounts include interest expense incurred by the Fund as a result of entering into reverse repurchase agreements. "Other expenses" (before addition of interest expense) and interest expense were 0.09% and 0.06%, respectively.

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO EMERGING COUNTRY DEBT FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Emerging Country Debt Fund USD ($)		Class III	168	^[1]	314	472	933		Class III	116	^[1]	257	410	856
Class IV, GMO Emerging Country Debt Fund USD ($)		Class IV	163	^[1]	298	445	873		Class IV	111	^[1]	241	383	796

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 21% of the average value of its portfolio.

Principal investment strategies

The Fund invests primarily in sovereign debt of emerging countries denominated in currencies of developed markets (e.g., U.S. dollar, Euro, Japanese yen, Swiss franc and British pound sterling). Under normal circumstances, the Fund invests directly and indirectly (e.g., through other GMO Funds or derivatives) at least 80% of its assets in debt investments tied economically to emerging countries (see “Name Policies”). The term “emerging countries” means the world’s less developed countries. The Fund typically gains its investment exposure by purchasing debt of sovereign issuers of emerging countries or by using derivatives, typically credit default swaps. The Fund also invests in U.S. and foreign asset-backed securities (including through Short-Duration Collateral Fund (“SDCF”) and World Opportunity Overlay Fund (“Overlay Fund”)). The Fund invests a substantial portion of its assets in below investment grade securities (also known as “junk bonds”). Generally, at least 75% of the Fund’s assets are denominated in, or hedged into, U.S. dollars.

In pursuing its investment objective, the Fund also typically uses exchange-traded and over-the-counter (“OTC”) derivatives, including options, swap contracts (in addition to credit default swaps), currency forwards (including currency forwards on currencies of developed markets), reverse repurchase agreements and futures. The Fund’s performance is likely to be more volatile than that of its benchmark.

The Manager emphasizes a “bottom-up” approach to examining and selecting investments and uses analytical techniques to identify inefficiencies in the pricing of emerging country debt investments and to identify investments the Manager believes are undervalued. The Manager also determines country allocations based on its outlook for a country.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

The Fund is not limited in its use of derivatives or in the absolute face value of its derivatives positions, and, as a result, the Fund may be leveraged in relation to its assets. The Manager normally seeks to cause the Fund’s estimated interest rate duration to approximate that of its benchmark (approximately 7.1 years as of 05/31/11). For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Fixed Income Funds – Duration.”

Principal risks of investing in the Fund

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Liquidity Risk – Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent the Fund from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind. Sovereign debt of emerging countries is not widely traded and may be subject to purchase and sale restrictions. In addition, because the Fund typically invests in securities that are less liquid than those in its benchmark, in rapidly declining markets the percentage decline in the Fund’s investments is likely to exceed that of its benchmark.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in a limited number of countries, regions, sectors or companies creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is a broad-based index) and a composite index computed by the Manager. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 20.29% (3Q2009)

Lowest Quarter: -23.39% (4Q2008)

Year-to-Date (as of 3/31/11): 2.53%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO EMERGING COUNTRY DEBT FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO Emerging Country Debt Fund	Class III	Return Before Taxes		24.39%	9.34%	14.88%	17.00%	Apr. 19, 1994
Return Before Taxes Class IV, GMO Emerging Country Debt Fund	Class IV	Return Before Taxes		24.50%	9.40%	14.95%	12.79%	Jan. 09, 1998
Return After Taxes on Distributions Class III, GMO Emerging Country Debt Fund	Class III	Return After Taxes on Distributions		19.02%	5.30%	10.08%	10.87%	Apr. 19, 1994
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Emerging Country Debt Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		15.35%	5.64%	10.06%	10.94%	Apr. 19, 1994
J.P. Morgan EMBI Global (Fund benchmark) Class III, GMO Emerging Country Debt Fund	Class III	J.P. Morgan EMBI Global (Fund benchmark)	(reflects no deduction for fees, expenses, or taxes)	12.04%	8.36%	10.29%	12.08%	Apr. 19, 1994
J.P. Morgan EMBI Global (Fund benchmark) Class IV, GMO Emerging Country Debt Fund	Class IV	J.P. Morgan EMBI Global (Fund benchmark)	(reflects no deduction for fees, expenses, or taxes)	12.04%	8.36%	10.29%	9.94%	Jan. 09, 1998
J.P. Morgan EMBI Global+ (Composite index) Class III, GMO Emerging Country Debt Fund	Class III	J.P. Morgan EMBI Global+ (Composite index)		12.04%	8.36%	10.29%	11.98%	Apr. 19, 1994
J.P. Morgan EMBI Global+ (Composite index) Class IV, GMO Emerging Country Debt Fund	Class IV	J.P. Morgan EMBI Global+ (Composite index)		12.04%	8.36%	10.29%	9.83%	Jan. 09, 1998

GMO SHORT-DURATION INVESTMENT FUND

Investment objective

Provide current income.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO SHORT-DURATION INVESTMENT FUND Class III, GMO Short-Duration Investment Fund
Operating Expenses Column [Text]		Class III
Management fee		0.05%
Shareholder service fee		0.15%
Other expenses		0.94%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.02%
Total annual operating expenses		1.16%
Expense reimbursement	^[2]	(0.94%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.22%

[1]

The amount has been restated to reflect current fees of certain underlying funds.

[2]

Subject to certain exclusions ("Excluded Fund Fees and Expenses"), Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.05% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. In addition, the Manager has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.05% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without consent by the Fund's Board of Trustees.

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO SHORT-DURATION INVESTMENT FUND Class III, GMO Short-Duration Investment Fund	Class III	23	^[1]	290	578	1,399

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 20% of the average value of its portfolio.

Principal investment strategies

The Fund is not currently pursuing its investment objective or an active investment program and is not acquiring new investments.

Historically, the Fund has sought to provide current income to the extent consistent with the preservation of capital and liquidity. The Fund primarily holds shares of Short Duration Collateral Fund (“SDCF”). SDCF primarily holds asset-backed securities, including, but not limited to, securities backed by pools of residential and commercial mortgages, credit-card receivables, home equity loans, automobile loans, educational loans, corporate and sovereign bonds and bank loans made to corporations. In addition, SDCF has invested in government securities, corporate debt securities, money market instruments and commercial paper and has entered into credit default swaps, reverse repurchase agreements, and repurchase agreements. SDCF has also used other exchange-traded and over-the-counter (“OTC”) derivatives. The Fund also has invested directly in asset-backed securities issued by private issuers, U.S. government and agency securities (including securities neither guaranteed nor insured by the U.S. government), corporate debt securities, money market instruments, prime commercial paper and master demand notes, and certificates of deposit, bankers’ acceptances and other bank obligations.

Because of the deterioration in credit markets that became acute in 2008, the Fund, in particular through its investment in SDCF, currently has and is expected to continue to have material exposure to below investment grade securities.

The Manager does not seek to maintain a specified interest rate duration for the Fund.

The Fund is not a money market fund and is not subject to the duration, quality, diversification and other requirements applicable to money market funds.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. The Fund and SDCF are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund or SDCF may affect the Fund’s performance more than if the Fund or SDCF were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Fixed Income Securities – Typically, the market value of the Fund’s fixed income securities will decline during periods of widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 6.11% (2Q2009)

Lowest Quarter: -10.36% (4Q2008)

Year-to-Date (as of 3/31/11): 0.72%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO SHORT-DURATION INVESTMENT FUND Class III, GMO Short-Duration Investment Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.		Inception Date
Return Before Taxes	Class III	Return Before Taxes		4.90%	2.42%	2.00%	4.10%	^[1]	Apr. 18, 1990
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		4.68%	1.20%	0.76%	2.30%	^[1]	Apr. 18, 1990
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		3.18%	1.35%	0.98%	2.42%	^[1]	Apr. 18, 1990
J.P. Morgan U.S. 3 Month Cash Index	Class III	J.P. Morgan U.S. 3 Month Cash Index	(reflects no deduction for fees, expenses, or taxes)	0.45%	3.37%	2.99%	4.43%	^[1]	Apr. 18, 1990

[1]	For the period from April 18, 1990 until June 30, 1991, the Fund operated as a money market fund.

GMO SHORT-DURATION COLLATERAL FUND

Investment objective

Total return comparable to that of its benchmark, the J.P. Morgan U.S. 3 Month Cash Index.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO SHORT-DURATION COLLATERAL FUND
Management fee		none
Other expenses	^[1]	0.03%
Total annual operating expenses		0.03%
Expense reimbursement	^[2]	(0.02%)
Total annual operating expenses after expense reimbursement		0.01%

[1]

"Other expenses" have been restated to reflect current fees.

[2]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO SHORT-DURATION COLLATERAL FUND	GMO Short-Duration Collateral Fund	1	^[1]	8	15	37

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 0% of the average value of its portfolio.

Principal investment strategies

The Fund is not currently pursuing its investment objective or an active investment program and is not acquiring new investments.

The Fund primarily holds asset-backed securities, including, but not limited to, securities backed by pools of residential and commercial mortgages, credit-card receivables, home equity loans, automobile loans, educational loans, corporate and sovereign bonds and bank loans made to corporations. In addition, the Fund has invested in government securities, corporate debt securities, money market instruments and commercial paper and has entered into credit default swaps, reverse repurchase agreements and repurchase agreements. The Fund has also used other exchange-traded and over-the-counter (“OTC”) derivatives.

Because of the deterioration in credit markets that became acute in 2008, the Fund currently has and is expected to continue to have material exposure to below investment grade securities.

The Manager does not seek to maintain a specified interest rate duration for the Fund.

Since October 2008, the Fund has declared and paid distributions when it has acquired a meaningful cash position rather than reinvesting that cash in portfolio securities. The Fund currently intends to continue this practice. A substantial portion of any such distributions could constitute a return of capital to shareholders for tax purposes. See “Distributions and Taxes” below for more information on the tax implications of such distributions.

Principal risks of investing in the Fund

• Market Risk – Fixed Income Securities – Typically, the market value of the Fund’s fixed income securities will decline during periods of widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

Performance

Annual Total Returns Years Ending December 31

Highest Quarter: 9.78% (2Q2009)

Lowest Quarter: -15.22% (4Q2008)

Year-to-Date (as of 3/31/11): 1.56%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO SHORT-DURATION COLLATERAL FUND	Label		Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes	Return Before Taxes			10.14%	3.65%	3.21%	Nov. 26, 2002
Return After Taxes on Distributions	Return After Taxes on Distributions	^[1]		9.61%	2.31%	2.12%	Nov. 26, 2002
Return After Taxes on Distributions and Sale of Fund Shares	Return After Taxes on Distributions and Sale of Fund Shares	^[1]		6.57%	2.31%	2.06%	Nov. 26, 2002
J.P. Morgan U.S. 3 Month Cash Index	J.P. Morgan U.S. 3 Month Cash Index		(reflects no deduction for fees, expenses, or taxes)	0.45%	3.37%	2.86%	Nov. 26, 2002

[1]	For periods prior to the public offering of the Fund's shares, which began on October 29, 2009, the Fund's after-tax returns reflect dividends that included certain non-deductible investment expenses.

GMO SHORT-DURATION COLLATERAL SHARE FUND

Investment objective

Total return comparable to that of its benchmark, the J.P. Morgan U.S. 3 Month Cash Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO SHORT-DURATION COLLATERAL SHARE FUND		Class III, GMO Short-Duration Collateral Share Fund	Class VI, GMO Short-Duration Collateral Share Fund
Operating Expenses Column [Text]		Class III	Class VI
Management fee		0.05%	0.05%
Shareholder service fee		0.15%	0.055%
Other expenses		0.16%	0.16%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.01%	0.01%
Total annual operating expenses		0.37%	0.28%
Expense reimbursement	^[2]	(0.16%)	(0.16%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.21%	0.12%

[1]

The amounts reflect the indirect net expenses associated with the Fund's investment in Short-Duration Collateral Fund ("SDCF").

[2]

Subject to certain exclusions ("Excluded Fund Fees and Expenses"), Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.05% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. In addition, the Manager has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in SDCF and other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.05% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

Example

Expense Example GMO SHORT-DURATION COLLATERAL SHARE FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Short-Duration Collateral Share Fund	Class III	22	^[1]	107	201	475
Class VI, GMO Short-Duration Collateral Share Fund	Class VI	12	^[1]	78	150	363

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 5% of the average value of its portfolio.

Principal investment strategies

The Fund invests substantially all of its assets in Short-Duration Collateral Fund (“SDCF”) (see page 100 for a discussion of SDCF). The Fund also may invest in U.S. Treasury Fund, unaffiliated money market funds, cash and cash equivalents. Its investment objective and principal investment strategies, therefore, are substantially similar to those of SDCF. SDCF is not currently pursuing its investment objective or an active investment program and is not acquiring new investments.

SDCF primarily holds asset-backed securities, including, but not limited to, securities backed by pools of residential and commercial mortgages, credit-card receivables, home equity loans, automobile loans, educational loans, corporate and sovereign bonds and bank loans made to corporations. In addition, SDCF has invested in government securities, corporate debt securities, money market instruments, and commercial paper, and has entered into credit default swaps, reverse repurchase agreements and repurchase agreements. SDCF has also used exchange-traded and over-the-counter (“OTC”) derivatives. Because of the deterioration in credit markets that became acute in 2008, the Fund, through its holdings of SDCF, currently has and is expected to continue to have material exposure to below investment grade securities.

The Manager does not seek to maintain a specified interest rate duration for SDCF.

Since October of 2008, SDCF has declared and paid distributions when it has acquired a meaningful cash position rather than reinvesting that cash in portfolio securities. SDCF currently intends to continue this practice. A substantial portion of any such distributions could constitute a return of capital to SDCF shareholders, including the Fund, for tax purposes. Therefore, if the Fund, in turn, distributes these amounts to its shareholders, the Fund’s distributions similarly could constitute a return of capital to Fund shareholders for tax purposes. See “Distributions and Taxes” below for more information on the tax implications of such distributions.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. Because the Fund invests substantially all of its assets in SDCF, the most significant risks of investing in the Fund are the risks to which the Fund is exposed through SDCF, which include those outlined in the following brief summary of principal risks. For a more complete discussion of these risks, see “Description of Principal Risks.” The Fund and SDCF are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund or SDCF may affect the Fund’s performance more than if the Fund or SDCF were diversified.

• Market Risk – Fixed Income Securities – Typically, the market value of SDCF’s fixed income securities will decline during periods of widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Liquidity Risk – Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent SDCF from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

Performance

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 9.62% (2Q2009)

Lowest Quarter: -14.97% (4Q2008)

Year-to-Date (as of 3/31/11): 1.52%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO SHORT-DURATION COLLATERAL SHARE FUND	Column		Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	Incept.	Inception Date
Return Before Taxes Class III, GMO Short-Duration Collateral Share Fund	Class III		Return Before Taxes		9.92%	3.00%	Dec. 28, 2006
Return Before Taxes Class VI, GMO Short-Duration Collateral Share Fund	Class VI	^[1]	Return Before Taxes		9.92%	3.43%	Mar. 01, 2006
Return After Taxes on Distributions Class III, GMO Short-Duration Collateral Share Fund	Class III		Return After Taxes on Distributions		9.54%	1.78%	Dec. 28, 2006
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Short-Duration Collateral Share Fund	Class III		Return After Taxes on Distributions and Sale of Fund Shares		6.45%	1.81%	Dec. 28, 2006
J.P. Morgan U.S. 3 Month Cash Index Class III, GMO Short-Duration Collateral Share Fund	Class III		J.P. Morgan U.S. 3 Month Cash Index	(reflects no deduction for fees, expenses, or taxes)	0.45%	2.90%	Dec. 28, 2006
J.P. Morgan U.S. 3 Month Cash Index Class VI, GMO Short-Duration Collateral Share Fund	Class VI	^[1]	J.P. Morgan U.S. 3 Month Cash Index	(reflects no deduction for fees, expenses, or taxes)	0.45%	3.33%	Mar. 01, 2006

[1]	As of the date of this Prospectus, no Class VI shares of the Fund have been outstanding since February 27, 2007. The returns shown in the table for that period are those of Class III shares, which have higher expenses than Class VI shares.

GMO INFLATION INDEXED PLUS BOND FUND

Investment objective

Total return in excess of that of its benchmark, the Barclays Capital U.S. Treasury Inflation Notes Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO INFLATION INDEXED PLUS BOND FUND		Class III, GMO Inflation Indexed Plus Bond Fund	Class VI, GMO Inflation Indexed Plus Bond Fund
Operating Expenses Column [Text]		Class III	Class VI
Management fee		0.25%	0.25%
Shareholder service fee	^[1]	0.15%	0.055%
Other expenses	^[2]	0.19%	0.19%
Acquired fund fees and expenses (underlying fund expenses)	^[3]	0.08%	0.08%
Total annual operating expenses		0.67%	0.58%
Expense reimbursement/waiver	^[1]	(0.20%)	(0.20%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.47%	0.38%

[1]	Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by a class of shares of the Fund exceeds the applicable shareholder service fee set forth in the table above; provided, however, that the amount of this waiver will not exceed 0.15%. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Fund's Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.
[2]	"Other expenses" have been restated to reflect current fees. These amounts include interest expense incurred by the Fund as a result of entering into reverse repurchase agreements. "Other expenses" (before addition of interest expense) and interest expense were approximately 0.19% and less than 0.01%, respectively.
[3]	The amounts have been restated to reflect current fees of certain underlying funds. These indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees and as restated), indirect interest expense, and indirect transaction fees were 0.02%, 0.01%, and 0.05%, respectively.

Example

Expense Example GMO INFLATION INDEXED PLUS BOND FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Inflation Indexed Plus Bond Fund	Class III	48	^[1]	199	362	838
Class VI, GMO Inflation Indexed Plus Bond Fund	Class VI	39	^[1]	168	308	718

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 81% of the average value of its portfolio.

Principal investment strategies

In selecting credit investments, the Manager uses fundamental investment techniques to assess the expected performance of these investments relative to the Fund’s benchmark.

In implementing these strategies, the Fund may hold or invest in:

• derivatives, including without limitation, futures contracts, currency options, interest rate options, currency forwards, reverse repurchase agreements, credit default swaps and other swap contracts (to generate a return comparable to the Fund’s benchmark and to gain exposure to inflation indexed bonds and/or the global interest rate, credit and currency markets);

• non-inflation indexed (or nominal) fixed income securities issued by the U.S. and foreign governments and their agencies or instrumentalities (including securities neither guaranteed nor insured by the U.S. government) and by corporations (to gain direct exposure to such securities and/or for use as part of a synthetic position);

• shares of Short-Duration Collateral Fund (“SDCF”) (to have exposure to asset-backed securities);

• shares of World Opportunity Overlay Fund (“Overlay Fund”) (to gain exposure to the global interest rate, credit and currency markets);

• shares of Emerging Country Debt Fund (“ECDF”) (to gain exposure to emerging country debt markets);

• shares of U.S. Treasury Fund and unaffiliated money market funds (for cash management purposes);

• shares of Debt Opportunities Fund (to gain exposure to global credit markets).

The Fund, primarily through its investments in shares of SDCF, Overlay Fund and ECDF, has and is expected to continue to have material exposures to below investment grade U.S. asset-backed and emerging country debt securities. The Fund is not limited in its use of derivatives or in the absolute face value of its derivatives positions, and, as a result, the Fund may be leveraged in relation to its assets.

Under normal circumstances, the Fund invests directly and indirectly (e.g., through other GMO Funds or derivatives) at least 80% of its assets in inflation indexed bonds (see “Name Policies”). For purposes of this Prospectus, the term “inflation indexed bonds” includes instruments that are “linked” to general measures of inflation because their principal and/or interest components change with general movements of inflation in the country of issue.

Principal risks of investing in the Fund

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads. In addition, increases in real interest rates may not be accompanied by increases in nominal interest rates. In such instances, the value of inflation indexed bonds may experience greater declines than non-inflation indexed (or nominal) fixed income investments with similar maturities. There can be no assurance that the value of the Fund’s inflation indexed bond investments will change in the same proportion as changes in nominal interest rates, and short-term increases in inflation may lead to a decline in their value.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund’s foreign currency holdings and investments denominated in foreign currencies.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 9.31% (3Q2009)

Lowest Quarter: -21.90% (4Q2008)

Year-to-Date (as of 3/31/11): 2.92%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO INFLATION INDEXED PLUS BOND FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	Incept.	Inception Date
Return Before Taxes Class III, GMO Inflation Indexed Plus Bond Fund	Class III	Return Before Taxes		13.93%	3.96%	Jun. 29, 2006
Return Before Taxes Class VI, GMO Inflation Indexed Plus Bond Fund	Class VI	Return Before Taxes		14.15%	3.98%	May 31, 2006
Return After Taxes on Distributions Class III, GMO Inflation Indexed Plus Bond Fund	Class III	Return After Taxes on Distributions		11.45%	0.70%	Jun. 29, 2006
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Inflation Indexed Plus Bond Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		9.20%	1.41%	Jun. 29, 2006
Barclays Capital U.S. Treasury Inflation Notes Index Class III, GMO Inflation Indexed Plus Bond Fund	Class III	Barclays Capital U.S. Treasury Inflation Notes Index	(reflects no deduction for fees, expenses, or taxes)	6.31%	6.46%	Jun. 29, 2006
Barclays Capital U.S. Treasury Inflation Notes Index Class VI, GMO Inflation Indexed Plus Bond Fund	Class VI	Barclays Capital U.S. Treasury Inflation Notes Index	(reflects no deduction for fees, expenses, or taxes)	6.31%	6.31%	May 31, 2006

GMO U.S. TREASURY FUND

Investment objective

Liquidity and safety of principal with

current income as a secondary objective.

Fees and expenses

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO U.S. TREASURY FUND
Management fee	^[1]	0.08%
Other expenses		0.03%
Total annual operating expenses		0.11%
Expense reimbursement	^[1]	(0.03%)
Total annual operating expenses after expense reimbursement		0.08%

[1]

Example

Expense Example (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO U.S. TREASURY FUND	GMO U.S. Treasury Fund	8	^[1]	32	59	138

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 0% of the average value of its portfolio.

Principal investment strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in Direct U.S. Treasury Obligations and repurchase agreements collateralized by these Obligations (see “Name Policies”). “Direct U.S. Treasury Obligations” include U.S. Treasury bills, bonds and notes and other securities issued by the U.S. Treasury, as well as Separately Traded Registered Interest and Principal Securities (STRIPS) and other zero-coupon securities. The Manager normally seeks to maintain an interest rate duration of one year or less for the Fund’s portfolio. For an additional discussion of duration, see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses — Fixed Income Funds — Duration.”

The Fund may also enter into repurchase agreements, under which the Fund purchases a security backed by the full faith and credit of the U.S. government from a seller who simultaneously commits to repurchase, on an agreed upon date in the future, the security from the Fund at the original purchase price plus an agreed upon amount representing the original purchase price plus interest. The counterparties in repurchase agreements are typically broker-dealers and banks, and the safety of the arrangement is dependent on, among other things, the Fund having an interest in the security that can be realized in the event of the insolvency of the counterparty.

In addition to Direct U.S. Treasury Obligations, the Fund may invest in other fixed-income securities that are backed by the full faith and credit of the U.S. government, such as guaranteed securities issued by the Government National Mortgage Association (GNMA) and the Federal Deposit Insurance Corporation (FDIC). For cash management purposes, the Fund may invest in unaffiliated money market funds.

Although the fixed-income securities purchased by the Fund normally will have a stated or remaining maturity of one year or less, Direct U.S. Treasury Obligations purchased pursuant to repurchase agreements may not, and, therefore, if the counterparty to the repurchase agreement defaults, the Fund may end up owning a security with a stated or remaining maturity of more than one year.

The Fund is not a money market fund and is not subject to the duration, quality, diversification and other requirements applicable to money market funds.

In selecting U.S. Treasury securities for the Fund’s portfolio, the Manager focuses primarily on the relative attractiveness of different obligations (such as bonds, notes or bills), which can vary depending on the general level of interest rates as well as supply/demand imbalances and other market conditions.

Principal risks of investing in the Fund

• Market Risk – Fixed Income Securities – Typically, the market value of the Fund’s U.S. Treasury and other fixed income securities will decline during periods of rising interest rates, and yields on the Fund’s securities may equal or approach zero under some market conditions.

• Credit Risk – Securities issued by the U.S. Treasury or U.S. government agencies generally present minimal credit risk. However, a security backed by the full faith and credit of the U.S. government is guaranteed only as to the timely payment of interest and principal when held to maturity. The market prices for such securities are not guaranteed and will fluctuate.

• Focused Investment Risk – Focusing investments in a particular type of security (e.g., Direct U.S. Treasury Obligations) creates additional risk.

• Management and Operational Risk – The Fund relies on GMO’s ability to achieve its investment objective by effectively implementing its investment approach. The Fund is also subject to the risk that deficiencies in the Manager’s or another service provider’s internal systems or controls will cause losses for the Fund or impair Fund operations.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing the Fund’s annual total return for the period indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns Year Ending December 31

Highest Quarter: 0.07% (2Q2010)

Lowest Quarter: -0.02% (1Q2010)

Year-to-Date (as of 3/31/11): 0.03%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO U.S. TREASURY FUND	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	Incept.	Inception Date
Return Before Taxes	Return Before Taxes		0.10%	0.21%	Mar. 17, 2009
Return After Taxes on Distributions	Return After Taxes on Distributions		0.05%	0.14%	Mar. 17, 2009
Return After Taxes on Distributions and Sale of Fund Shares	Return After Taxes on Distributions and Sale of Fund Shares		0.06%	0.14%	Mar. 17, 2009
Citigroup 3-Month Treasury Bill Index	Citigroup 3-Month Treasury Bill Index	(reflects no deduction for fees, expenses, or taxes)	0.13%	0.14%	Mar. 17, 2009

GMO ASSET ALLOCATION BOND FUND

Investment objective

Total return in excess of that of its benchmark, the Citigroup 3-Month Treasury Bill Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO ASSET ALLOCATION BOND FUND		Class III, GMO Asset Allocation Bond Fund	Class VI, GMO Asset Allocation Bond Fund
Operating Expenses Column [Text]		Class III	Class VI
Management fee		0.25%	0.25%
Shareholder service fee	^[1]	0.15%	0.055%
Other expenses	^[2]	0.08%	0.08%
Total annual operating expenses		0.48%	0.39%
Expense reimbursement/waiver	^[1]	(0.04%)	(0.04%)
Total annual operating expenses after expense reimbursement/waiver		0.44%	0.35%

[1]

Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by a class of shares of the Fund exceeds the applicable shareholder service fee set forth in the table above; provided, however, that the amount of this waiver will not exceed the applicable shareholder service fee set forth in the table above. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

[2]

The amounts include interest expense incurred by the Fund as a result of entering into reverse repurchase agreements. "Other expenses" (before addition of interest expense) and interest expense were 0.05% and 0.03%, respectively.

Example

Expense Example GMO ASSET ALLOCATION BOND FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
Class III, GMO Asset Allocation Bond Fund	Class III	45	^[1]	148	260	589
Class VI, GMO Asset Allocation Bond Fund	Class VI	36	^[1]	119	210	477

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 315% of the average value of its portfolio.

Principal investment strategies

The Fund may invest in any sector of the bond market and is not required to maintain a minimum or maximum allocation of investments in any one sector. The sectors and types of bonds in which the Fund may invest include, but are not limited to:

• below investment grade bonds (also known as “junk bonds”);

• sovereign debt of emerging countries and other bonds issued in emerging countries (including junk bonds); and

• asset-backed securities, including mortgage related and mortgage-backed securities.

The Fund may gain exposure to the investments described above through investments in shares of other GMO Funds, including High Quality Short-Duration Bond Fund (to seek to generate a return in excess of that of the J.P. Morgan U.S. 3 Month Cash Index by investing in a wide variety of high quality U.S. and foreign debt investments), Debt Opportunities Fund (to gain exposure to global credit markets) and U.S. Treasury Fund (for cash management purposes). The Fund also may invest in unaffiliated money market funds for cash management purposes.

The Fund may invest up to 100% of its assets in junk bonds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. The Fund is a non-diversified investment company under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund may affect the Fund's performance more than if the Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, see “Description of Principal Risks.”

• Market Risk – Fixed Income Securities – Typically, the market value of the Fund's fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer's failure to meet its payment obligations or the market's expectation of a default, which may result from the downgrading of the issuer's credit rating. The Fund's investments in below investment grade securities have speculative characteristics, and changes in economic conditions or other circumstances are more likely to impair the capacity of issuers to make principal and interest payments than is the case with issuers of investment grade securities.

• Counterparty Risk – The Fund runs the risk that the counterparty to an OTC derivatives contract or a borrower of the Fund's securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations. The risk of counterparty default is particularly acute in economic environments in which financial services firms are exposed to systemic risks of the type evidenced by the insolvency of Lehman Brothers in 2008 and subsequent market disruptions.

• Leveraging Risk – The Fund's use of reverse repurchase agreements and other derivatives and securities lending may cause its portfolio to be leveraged. Leverage increases the Fund's portfolio losses when the value of its investments decline.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Management and Operational Risk – The Fund relies on GMO's ability to achieve its investment objective by effectively implementing its investment approach. The Fund runs the risk that GMO's proprietary investment techniques will fail to produce the desired results. The Fund's portfolio managers may use quantitative analyses and/or models and any imperfections or limitations in such analyses and/or models could affect the ability of the portfolio managers to implement strategies. By necessity, these analyses and models make simplifying assumptions that limit their efficacy. Models that appear to explain prior market data can fail to predict future market events. Further, the data used in models may be inaccurate and/or it may not include the most recent information about a company or a security. The Fund is also subject to the risk that deficiencies in the Manager's or another service provider's internal systems or controls will cause losses for the Fund or impair Fund operations.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund's investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of the Fund's foreign currency holdings and investments denominated in foreign currencies.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies with high positive correlations to one another creates additional risk.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund's operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

Annual Total Returns/Class III Shares Year Ending December 31

Highest Quarter: 1.83% (3Q2010)

Lowest Quarter: -0.36% (4Q2010)

Year-to-Date (as of 3/31/11): 1.94%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO ASSET ALLOCATION BOND FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	Incept.	Inception Date
Return Before Taxes Class III, GMO Asset Allocation Bond Fund	Class III	Return Before Taxes		4.02%	5.85%	Mar. 27, 2009
Return Before Taxes Class VI, GMO Asset Allocation Bond Fund	Class VI	Return Before Taxes		4.14%	6.24%	Mar. 18, 2009
Return After Taxes on Distributions Class III, GMO Asset Allocation Bond Fund	Class III	Return After Taxes on Distributions		0.95%	3.49%	Mar. 27, 2009
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Asset Allocation Bond Fund	Class III	Return After Taxes on Distribution and Sale of Fund Shares		2.63%	3.66%	Mar. 27, 2009
Citigroup 3-Month Treasury Bill Index Class III, GMO Asset Allocation Bond Fund	Class III	Citigroup 3-Month Treasury Bill Index	(reflects no deduction for fees, expenses, or taxes)	0.13%	0.14%	Mar. 27, 2009
Citigroup 3-Month Treasury Bill Index Class VI, GMO Asset Allocation Bond Fund	Class VI	Citigroup 3-Month Treasury Bill Index	(reflects no deduction for fees, expenses, or taxes)	0.13%	0.14%	Mar. 18, 2009

GMO ASSET ALLOCATION INTERNATIONAL BOND FUND

Investment objective

Total return in excess of that of its benchmark, the J.P. Morgan Non-U.S. Government Bond Index.

Fees and expenses

The table below describes the fees and expenses that you may pay for each class of shares if you buy and hold shares of the Fund.

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO ASSET ALLOCATION INTERNATIONAL BOND FUND		Class III, GMO Asset Allocation International Bond Fund	Class VI, GMO Asset Allocation International Bond Fund
Operating Expenses Column [Text]		Class III	Class VI
Management fee		0.25%	0.25%
Shareholder service fee	^[1]	0.15%	0.055%
Other expenses	^[2]	0.18%	0.18%
Total annual operating expenses	^[2]	0.58%	0.49%
Expense reimbursement/waiver	^[1][2]	(0.18%)	(0.18%)
Total annual operating expenses after expense reimbursement/waiver	^[2]	0.40%	0.31%

[1]

Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by a class of shares of the Fund exceeds the applicable shareholder service fee set forth in the table above; provided, however, that the amount of this waiver will not exceed the applicable shareholder service fee set forth in the table above. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.25% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.25% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

[2]

The amounts represent an annualized estimate of the Fund's operating expenses for its initial fiscal year.

Example

Expense Example GMO ASSET ALLOCATION INTERNATIONAL BOND FUND (USD $)	Expense Example, By Year, Column [Text]	1 Year	3 Years
Class III, GMO Asset Allocation International Bond Fund	Class III	59	186
Class VI, GMO Asset Allocation International Bond Fund	Class VI	50	157

Portfolio turnover

The Fund pays transaction costs when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund operating expenses or in the Example, affect the Fund’s performance. Because the Fund commenced operations on or following the date of this Prospectus, the Fund’s portfolio turnover rate is not available.

Principal investment strategies

Under normal circumstances, the Fund invests directly and indirectly (e.g., through other GMO Funds or derivatives) at least 80% of its assets in bonds (see “Name Policies”). The term “bond” includes (i) obligations of an issuer to make payments of principal and/or interest (whether fixed or variable) on future dates and (ii) synthetic debt instruments created by the Manager by using derivatives (e.g., a futures contract, swap contract, currency forward or option). The Fund is permitted to invest in bonds of any kind (e.g., bonds of any maturity, duration or credit quality). While the Fund principally invests in non-U.S. bonds, it may invest in any sector of the bond market and is not required to maintain a minimum or maximum allocation of investments in any one sector. The sectors and types of bonds in which the Fund may invest include, but are not limited to:

• foreign government securities and other investment grade bonds denominated in various currencies, including bonds issued by the U.S. government, and their agencies or instrumentalities (as well as bonds neither guaranteed nor insured by the U.S. government), corporate bonds and taxable and tax-exempt municipal bonds;

• below investment grade bonds (also known as “junk bonds”);

• inflation indexed bonds issued by foreign governments and the U.S. government (including Inflation-Protected Securities issued by the U.S. Treasury (TIPS)) and their agencies or instrumentalities (as well as bonds neither guaranteed nor insured by the U.S. and/or foreign governments) and inflation indexed bonds issued by corporations;

• sovereign debt of emerging countries and other bonds issued in emerging countries (including junk bonds); and

• asset-backed securities, including mortgage related and mortgage-backed securities.

The Fund may also invest in exchange-traded and over-the-counter (“OTC”) derivatives, including futures contracts, currency options, currency forwards, reverse repurchase agreements, swap contracts (including credit default swaps), interest rate options, swaps on interest rates and other types of derivatives. The Fund is not limited in its use of derivatives or in the absolute face value of its derivatives positions, and, as a result, the Fund may be leveraged in relation to its assets.

The Fund may invest up to 100% of its assets in junk bonds.

The Manager does not seek to maintain a specified interest rate duration for the Fund, and the Fund's interest rate duration will change depending on the Fund's investments and the Manager's assessment of different sectors of the bond market.

Principal risks of investing in the Fund

• Currency Risk – Fluctuations in exchange rates will adversely affect the market value of the Fund's foreign currency holdings and investments denominated in foreign currencies.

• Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer's failure to meet its payment obligations or the market's expectation of a default, which may result from the downgrading of the issuer's credit rating. The Fund's investments in below investment grade securities have speculative characteristics, and changes in economic conditions or other circumstances are more likely to impair the capacity of issuers to make principal and interest payments than is the case with issuers of investment grade securities.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund's investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Focused Investment Risk – Focusing investments in countries, regions or sectors or in industries with high positive correlations to one another creates additional risk.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund's operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

Because the Fund had not yet completed a full calendar year of operations as of the date of this Prospectus, performance information for the Fund is not included.

GMO U.S. EQUITY ALLOCATION FUND

Investment objective

Total return greater than that of its benchmark, the Russell 3000 Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO U.S. EQUITY ALLOCATION FUND Class III, GMO U.S. Equity Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	none
Redemption fee (as a percentage of amount redeemed)	none

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO U.S. EQUITY ALLOCATION FUND Class III, GMO U.S. Equity Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.06%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.39%
Total annual operating expenses		0.45%
Expense reimbursement	^[2]	(0.06%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.39%

[1]

The amount has been restated to reflect current fees of certain underlying funds. These indirect expenses include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of transaction fees and as restated) and indirect transaction fees were approximately 0.39% and less than 0.01%, respectively.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO U.S. EQUITY ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO U.S. Equity Allocation Fund USD ($)		Class III	40	^[1]	151	273	629		Class III	40	^[1]	151	273	629

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in shares of the U.S. Equity Funds (see “Additional Information About the Funds' Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). The Fund also may invest in shares of Flexible Equities Fund (together with the U.S. Equity Funds, the “underlying Funds”). In addition, the Fund may hold securities directly. The Fund primarily seeks exposure to U.S. equity investments (which may include both growth and value style equities and equities of any market capitalization). The Fund also may have exposure to foreign equity investments. Under normal circumstances, the Fund invests (including through investment in the underlying Funds) at least 80% of its assets in equity investments tied economically to the U.S. (see “Name Policies”). The term “equity investments” refers to direct and indirect (e.g., through the underlying Funds) investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

The Manager uses multi-year forecasts of relative value and risk among major sectors in the U.S. equity market (large-cap value, large-cap growth, large-cap core, small- and mid-cap value, small- and mid-cap growth and real estate/REIT) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund's holdings of underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund's investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund's investments in the underlying Funds. The Fund and some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by the Fund or an underlying Fund may affect the Fund's or the underlying Fund's performance more than if the Fund or the underlying Fund were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund and the underlying Funds normally do not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in the underlying Funds, including the risk that the underlying Funds in which it invests do not perform as expected. Because the Fund bears the fees and expenses of the underlying Funds in which it invests, new investments in underlying Funds with higher fees or expenses than those of the underlying Funds in which the Fund is currently invested will increase the Fund's total expenses. The fees and expenses associated with an investment in the Fund are less predictable and may be higher than fees and expenses associated with an investment in funds that charge a fixed management fee.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of foreign currency holdings and investments denominated in foreign currencies.

• Liquidity Risk – Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent the Fund or an underlying Fund from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Counterparty Risk – The Fund runs the risk that the counterparty to an over-the-counter (OTC) derivatives contract or a borrower of the Fund's securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations.

• Real Estate Risk – To the extent an underlying Fund concentrates its assets in real estate-related investments, the value of its portfolio is subject to factors affecting the real estate industry and may fluctuate more than the value of a portfolio that consists of securities of companies in a broader range of industries.

• Short Sales Risk – The Fund runs the risk that an underlying Fund's loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Leveraging Risk – The use of derivatives and securities lending may cause the Fund's portfolio to be leveraged. Leverage increases the Fund's portfolio losses when the value of its investments decline.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors), the Fund is subject to the risk that these shareholders will disrupt the Fund's operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is a broad-based index) and a composite index computed by the Manager. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table may be lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

^[10]

Highest Quarter: 18.06% (2Q2003)

Lowest Quarter: -16.54% (3Q2002)

Year to Date (as of 3/31/11): 4.15%

Average Annual Total Returns Periods Ending December 31, 2010

^[10]

Average Annual Total Returns GMO U.S. EQUITY ALLOCATION FUND Class III, GMO U.S. Equity Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		7.70%	1.24%	4.15%	9.97%	Dec. 31, 1992
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		7.38%	0.17%	3.24%	6.15%	Dec. 31, 1992
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		5.38%	1.90%	3.59%	7.07%	Dec. 31, 1992
Russell 3000 Index (Fund benchmark)	Class III	Russell 3000 Index (Fund benchmark)	(reflects no deduction for fees, expenses, or taxes)	16.93%	2.74%	2.16%	8.29%	Dec. 31, 1992
Russell 3000 ++ Index (Composite index)	Class III	Russell 3000 ++ Index (Composite index)		16.93%	2.74%	2.03%	8.51%	Dec. 31, 1992

GMO INTERNATIONAL EQUITY ALLOCATION FUND

Investment objective

Total return greater than that of its benchmark, the MSCI ACWI ex-U.S. Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO INTERNATIONAL EQUITY ALLOCATION FUND Class III, GMO International Equity Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.21%
Redemption fee (as a percentage of amount redeemed)	0.21%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO INTERNATIONAL EQUITY ALLOCATION FUND Class III, GMO International Equity Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.01%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.72%
Total annual operating expenses		0.73%
Expense reimbursement	^[2]	(0.01%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.72%

[1]

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO INTERNATIONAL EQUITY ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO International Equity Allocation Fund USD ($)		Class III	116	^[1]	287	473	1,011		Class III	94	^[1]	264	447	979

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in shares of the International Equity Funds (see “Additional Information About the Funds' Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). The Fund also may invest in shares of other GMO Funds, including the Fixed Income Funds, Alpha Only Fund and Alternative Asset Opportunity Fund (the GMO Funds in which the Fund invests are collectively referred to herein as the “underlying Funds”). In addition, the Fund may hold securities directly. Although the Fund's primary exposure is to foreign equity investments (which may include emerging country equities, both growth and value style equities and equities of any market capitalization), the Fund also may have exposure to foreign and U.S. fixed income securities (including fixed income securities of any credit quality and having any maturity or duration), as well as to the investment returns of commodities and, from time to time, other alternative asset classes. Under normal circumstances, the Fund invests (including through investment in the underlying Funds) at least 80% of its assets in equity investments (see “Name Policies”). The term “equity investments” refers to direct and indirect (e.g., through the underlying Funds) investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., foreign equity, emerging country equity, emerging country debt, foreign fixed income, U.S. fixed income and commodities) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund's holdings of underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund's investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund's investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by those Funds may affect their performance more than if they were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund and the underlying Funds normally do not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund's investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of foreign currency holdings and investments denominated in foreign currencies.

• Liquidity Risk – Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent the Fund or an underlying Fund from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in the underlying Funds, including the risk that the underlying Funds in which it invests do not perform as expected. Because the Fund bears the fees and expenses of the underlying Funds in which it invests, new investments in underlying Funds with higher fees or expenses than those of the underlying Funds in which the Fund is currently invested will increase the Fund's total expenses. The fees and expenses associated with an investment in the Fund are less predictable and may be higher than fees and expenses associated with an investment in funds that charge a fixed management fee.

• Commodities Risk – To the extent an underlying Fund has exposure to global commodity markets, the value of its shares is affected by factors particular to the commodity markets and may fluctuate more than the value of shares of a fund with a broader range of investments.

• Leveraging Risk – The use of reverse repurchase agreements and other derivatives and securities lending may cause the Fund's portfolio to be leveraged. Leverage increases the Fund's portfolio losses when the value of its investments decline.

• Short Sales Risk – The Fund runs the risk that an underlying Fund's loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 21.94% (2Q2009)

Lowest Quarter: -20.16% (3Q2008)

Year-to-Date (as of 3/31/11): 3.35%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO INTERNATIONAL EQUITY ALLOCATION FUND Class III, GMO International Equity Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		12.55%	4.55%	9.89%	8.61%	Oct. 11, 1996
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		12.29%	2.28%	8.11%	6.73%	Oct. 11, 1996
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		8.32%	3.51%	8.23%	6.83%	Oct. 11, 1996
MSCI ACWI ex-U.S. Index	Class III	MSCI ACWI ex-U.S. Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.15%	4.82%	5.55%	5.93%	Oct. 11, 1996

GMO INTERNATIONAL OPPORTUNITIES EQUITY ALLOCATION FUND

Investment objective

Total return greater than that of its benchmark, the MSCI EAFE Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO INTERNATIONAL OPPORTUNITIES EQUITY ALLOCATION FUND Class III, GMO International Opportunities Equity Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	none
Redemption fee (as a percentage of amount redeemed)	none

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO INTERNATIONAL OPPORTUNITIES EQUITY ALLOCATION FUND Class III, GMO International Opportunities Equity Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.02%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.63%
Total annual operating expenses		0.65%
Expense reimbursement	^[2]	(0.02%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.63%

[1]

The amount has been restated to reflect current fees of certain underlying funds. These indirect expenses include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of transaction fees) and indirect transaction fees were 0.61% and 0.02%, respectively.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO INTERNATIONAL OPPORTUNITIES EQUITY ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO International Opportunities Equity Allocation Fund USD ($)		Class III	64	^[1]	217	383	864		Class III	64	^[1]	217	383	864

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., foreign equity, emerging country equity, emerging country debt, foreign fixed income, U.S. fixed income and commodities) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund's holdings of the underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund's investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund's investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by those Funds may affect their performance more than if they were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund and the underlying Funds normally do not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of foreign currency holdings and investments denominated in foreign currencies.

• Short Sales Risk – The Fund runs the risk that an underlying Fund's loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table may be lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 19.55% (2Q2009)

Lowest Quarter: -18.80% (3Q2008)

Year-to-Date (as of 3/31/11): 2.96%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO INTERNATIONAL OPPORTUNITIES EQUITY ALLOCATION FUND Class III, GMO International Opportunities Equity Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		10.86%	1.29%	Jun. 05, 2006
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		10.65%	(0.24%)	Jun. 05, 2006
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		7.33%	0.79%	Jun. 05, 2006
MSCI EAFE Index	Class III	MSCI EAFE Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	7.75%	0.31%	Jun. 05, 2006

GMO GLOBAL EQUITY ALLOCATION FUND

Investment objective

Total return greater than that of its benchmark, the MSCI ACWI Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO GLOBAL EQUITY ALLOCATION FUND Class III, GMO Global Equity Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.13%
Redemption fee (as a percentage of amount redeemed)	0.13%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO GLOBAL EQUITY ALLOCATION FUND Class III, GMO Global Equity Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.02%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.58%
Total annual operating expenses		0.60%
Expense reimbursement	^[2]	(0.02%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.58%

[1]

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO GLOBAL EQUITY ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Global Equity Allocation Fund USD ($)		Class III	86	^[1]	226	379	825		Class III	72	^[1]	212	363	805

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in shares of the International Equity Funds and the U.S. Equity Funds (see “Additional Information About the Funds' Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). The Fund also may invest in shares of other GMO Funds, including the Fixed Income Funds, Alpha Only Fund and Alternative Asset Opportunity Fund (the GMO Funds in which the Fund invests are collectively referred to herein as the “underlying Funds”). In addition, the Fund may hold securities directly. Although the Fund's primary exposure is to foreign and U.S. equity investments (which may include emerging country equities, both growth and value style equities and equities of any market capitalization), the Fund also may have exposure to foreign and U.S. fixed income securities (including fixed income securities of any credit quality and having any maturity or duration), the investment returns of commodities and, from time to time, other alternative asset classes. Under normal circumstances, the Fund invests (including through investment in the underlying Funds) at least 80% of its assets in equity investments (see “Name Policies”). The term “equity investments” refers to direct and indirect (e.g., through the underlying Funds) investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., U.S. equity, foreign equity, emerging country equity, emerging country debt, foreign fixed income, U.S. fixed income and commodities) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund's holdings of the underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund's investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund's investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by those Funds may affect their performance more than if they were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund and the underlying Funds normally do not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund's investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Derivatives risk – The use of derivatives involves the risk that their value may not move as expected relative to the value of the relevant underlying assets, rates or indices. Derivatives also present other Fund risks, including market risk, liquidity risk, currency risk and counterparty risk.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of foreign currency holdings and investments denominated in foreign currencies, or that the U.S. dollar will decline in value relative to the foreign currency being hedged.

• Short Sales Risk – The Fund runs the risk that an underlying Fund's loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of the Fund’s benchmark (which is a broad-based index) and a composite index computed by the Manager. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 18.79% (2Q2003)

Lowest Quarter: -15.65% (4Q2008)

Year-to-Date (as of 3/31/11): 3.49%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO GLOBAL EQUITY ALLOCATION FUND Class III, GMO Global Equity Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		9.69%	3.14%	6.87%	8.30%	Nov. 26, 1996
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		9.45%	1.49%	5.38%	6.00%	Nov. 26, 1996
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		6.52%	2.40%	5.59%	6.22%	Nov. 26, 1996
MSCI ACWI Index (Fund benchmark)	Class III	MSCI ACWI Index (Fund benchmark)	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	12.67%	3.44%	3.20%	5.26%	Nov. 26, 1996
MSCI ACWI + Index (Composite index)	Class III	MSCI ACWI + Index (Composite index)		12.67%	2.24%	2.12%	5.37%	Nov. 26, 1996

GMO WORLD OPPORTUNITIES EQUITY ALLOCATION FUND

Investment objective

Total return greater than that of its benchmark, the MSCI World Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO WORLD OPPORTUNITIES EQUITY ALLOCATION FUND Class III, GMO World Opportunities Equity Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	none
Redemption fee (as a percentage of amount redeemed)	none

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO WORLD OPPORTUNITIES EQUITY ALLOCATION FUND Class III, GMO World Opportunities Equity Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.02%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.53%
Total annual operating expenses		0.55%
Expense reimbursement	^[2]	(0.01%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.54%

[1]

The amount has been restated to reflect current fees of certain underlying funds. These indirect expenses include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of transaction fees) and indirect transaction fees were 0.50% and 0.03%, respectively.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO WORLD OPPORTUNITIES EQUITY ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO World Opportunities Equity Allocation Fund USD ($)		Class III	55	^[1]	184	324	733		Class III	55	^[1]	184	324	733

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in shares of the International Equity Funds and the U.S. Equity Funds (see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). The Fund also may invest in shares of other GMO Funds, including the Fixed Income Funds, Alpha Only Fund and Alternative Asset Opportunity Fund (the GMO Funds in which the Fund invests are collectively referred to herein as the “underlying Funds”). In addition, the Fund may hold securities directly. Although the Fund’s primary exposure is to foreign and U.S. equity investments (which may include emerging country equities, both growth and value style equities and equities of any market capitalization), the Fund also may have exposure to foreign and U.S. fixed income securities (including fixed income securities of any credit quality and having any maturity or duration), the investment returns of commodities and, from time to time, other alternative asset classes. Under normal circumstances, the Fund invests (including through investment in the underlying Funds) at least 80% of its assets in equity investments (see “Name Policies”). The term “equity investments” refers to direct and indirect (e.g., through the underlying Funds) investments in common stocks and other stock-related securities, such as preferred stocks, convertible securities and depositary receipts.

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., U.S. equity, foreign equity, emerging country equity, emerging country debt, foreign fixed income, U.S. fixed income and commodities) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund’s holdings of underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund’s investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund’s investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by those Funds may affect their performance more than if they were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Because the Fund and the underlying Funds normally do not take temporary defensive positions, declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund’s investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Liquidity Risk – Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent the Fund or an underlying Fund from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in the underlying Funds, including the risk that the underlying Funds in which it invests do not perform as expected. Because the Fund bears the fees and expenses of the underlying Funds in which it invests, new investments in underlying Funds with higher fees or expenses than those of the underlying Funds in which the Fund is currently invested will increase the Fund’s total expenses. The fees and expenses associated with an investment in the Fund are less predictable and may be higher than fees and expenses associated with an investment in funds that charge a fixed management fee.

• Commodities Risk – To the extent an underlying Fund has exposure to global commodity markets, the value of its shares is affected by factors particular to the commodity markets and may fluctuate more than the value of shares of a fund with a broader range of investments.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of foreign currency holdings and investments denominated in foreign currencies, or that the U.S. dollar will decline in value relative to the foreign currency being hedged.

• Leveraging Risk – The use of reverse repurchase agreements and other derivatives and securities lending may cause the Fund’s portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

• Counterparty Risk – The Fund runs the risk that the counterparty to an over-the-counter (OTC) derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations.

• Real Estate Risk – To the extent an underlying Fund concentrates its assets in real estate-related investments, the value of its portfolio is subject to factors affecting the real estate industry and may fluctuate more than the value of a portfolio that consists of securities of companies in a broader range of industries.

• Short Sales Risk – The Fund runs the risk that an underlying Fund’s loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer’s failure to meet its payment obligations or the market’s expectation of a default, which may result from the downgrading of the issuer’s credit rating.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors), the Fund is subject to the risk that these shareholders will disrupt the Fund’s operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table may be lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 14.41% (3Q2010)

Lowest Quarter: -15.27% (4Q2008)

Year-to-Date (as of 3/31/11): 3.34%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO WORLD OPPORTUNITIES EQUITY ALLOCATION FUND Class III, GMO World Opportunities Equity Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		9.00%	3.25%	4.76%	Jun. 16, 2005
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		8.75%	2.12%	3.61%	Jun. 16, 2005
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		6.18%	2.59%	3.87%	Jun. 16, 2005
MSCI World Index	Class III	MSCI World Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.76%	2.43%	3.88%	Jun. 16, 2005

GMO GLOBAL BALANCED ASSET ALLOCATION FUND

Investment objective

Total return greater than that of its benchmark, the GMO Global Balanced Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO GLOBAL BALANCED ASSET ALLOCATION FUND Class III, GMO Global Balance Asset Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.10%
Redemption fee (as a percentage of amount redeemed)	0.10%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO GLOBAL BALANCED ASSET ALLOCATION FUND Class III, GMO Global Balance Asset Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.01%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.53%
Total annual operating expenses		0.54%
Expense reimbursement	^[2]	(0.01%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.53%

[1]

The amount has been restated to reflect current fees of certain underlying funds. These indirect expenses include interest expense that may be incurred by certain underlying funds and also include, to the extent applicable, purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of interest expense and transaction fees and as restated), indirect interest expense, and indirect transaction fees were approximately 0.48%, less than 0.01%, and 0.05%, respectively.

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO GLOBAL BALANCED ASSET ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Global Balance Asset Allocation Fund USD ($)		Class III	75	^[1]	217	372	824		Class III	64	^[1]	206	360	808

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in shares of other GMO Funds, which may include the International Equity Funds, the U.S. Equity Funds, the Fixed Income Funds, Alpha Only Fund, Alternative Asset Opportunity Fund, Debt Opportunities Fund, High Quality Short-Duration Bond Fund, Special Situations Fund and World Opportunity Overlay Fund (collectively, the “underlying Funds”) (see “Additional Information About the Funds’ Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). In addition, the Fund may hold securities (particularly asset-backed securities) directly or through one or more subsidiaries or other entities. The Fund may be exposed to foreign and U.S. equity investments (which may include emerging country equities, both growth and value style equities and equities of any market capitalization), U.S. and foreign fixed income securities (including asset-backed securities and other fixed income securities of any credit quality and having any maturity or duration), the investment returns of commodities and, from time to time, other alternative asset classes.

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., foreign equity, U.S. equity, emerging country equity, emerging country debt, U.S. fixed income, foreign fixed income and commodities) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund’s holdings of underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund’s investments. The Manager, however, intends to invest at least 25% of the Fund’s assets in fixed income investments and at least 25% in equity investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund’s shares changes with the value of the Fund’s investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund’s investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by those Funds may affect their performance more than if they were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager’s overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Declines in stock market prices generally are likely to reduce the net asset value of the Fund’s shares.

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Fund of Funds Risk – The Fund is indirectly exposed to all of the risks of an investment in the underlying Funds, including the risk that the underlying Funds in which it invests do not perform as expected. Because the Fund bears the fees and expenses of the underlying Funds in which it invests, new investments in underlying Funds with higher fees or expenses than those of the underlying Funds in which the Fund is currently invested will increase the Fund’s total expenses. The fees and expenses associated with an investment in the Fund are less predictable and may be higher than fees and expenses associated with an investment in funds that charge a fixed management fee.

• Leveraging Risk – The use of reverse repurchase agreements and other derivatives and securities lending may cause the Fund’s portfolio to be leveraged. Leverage increases the Fund’s portfolio losses when the value of its investments decline.

• Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer’s failure to meet its payment obligations or the market’s expectation of a default, which may result from the downgrading of the issuer’s credit rating. Below investment grade securities have speculative characteristics, and changes in economic conditions or other circumstances are more likely to impair the capacity of issuers to make principal and interest payments than is the case with issuers of investment grade securities.

• Counterparty Risk – The Fund runs the risk that the counterparty to an over-the-counter (OTC) derivatives contract or a borrower of the Fund’s securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations.

• Short Sales Risk – The Fund runs the risk that an underlying Fund’s loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors), the Fund is subject to the risk that these shareholders will disrupt the Fund’s operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of broad-based indices, and composite indices, including the Fund’s benchmark, computed by the Manager. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 14.27% (2Q2003)

Lowest Quarter: -9.87% (3Q2001)

Year-to-Date (as of 3/31/11): 2.60%

Average Annual Total Returns Periods Ending December 31, 2009

^[11]

Average Annual Total Returns GMO GLOBAL BALANCED ASSET ALLOCATION FUND Class III, GMO Global Balance Asset Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		7.17%	5.18%	7.63%	7.95%	Jun. 28, 1996
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		6.70%	3.22%	5.86%	5.74%	Jun. 28, 1996
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		4.81%	3.55%	5.77%	5.73%	Jun. 28, 1996
MSCI ACWI Index	Class III	MSCI ACWI Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	12.67%	3.44%	3.20%	5.62%	Jun. 28, 1996
Barclays Capital U.S. Aggregate Index	Class III	Barclays Capital U.S. Aggregate Index	(reflects no deduction for fees, expenses, or taxes)	6.54%	5.80%	5.84%	6.35%	Jun. 28, 1996
GMO Global Balanced Index (Fund benchmark)	Class III	GMO Global Balanced Index (Fund benchmark)		11.05%	4.31%	3.98%	6.61%	Jun. 28, 1996
Global Balanced Benchmark+ Index (Composite index)	Class III	Global Balanced Benchmark+ Index (Composite index)		11.05%	4.31%	2.49%	5.12%	Jun. 28, 1996

GMO STRATEGIC OPPORTUNITIES ALLOCATION FUND

Investment objective

Total return greater than that of its benchmark, the GMO Strategic Opportunities Allocation Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO STRATEGIC OPPORTUNITIES ALLOCATION FUND Class III, GMO Strategic Opportunities Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	none
Redemption fee (as a percentage of amount redeemed)	none

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		GMO STRATEGIC OPPORTUNITIES ALLOCATION FUND Class III, GMO Strategic Opportunities Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.01%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.54%
Total annual operating expenses		0.55%
Expense reimbursement	^[2]	(0.01%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.54%

[1]

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO STRATEGIC OPPORTUNITIES ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Strategic Opportunities Allocation Fund USD ($)		Class III	55	^[1]	190	338	767		Class III	55	^[1]	190	338	767

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in shares of other GMO Funds, which may include the International Equity Funds, the U.S. Equity Funds, the Fixed Income Funds, Alpha Only Fund, Alternative Asset Opportunity Fund, Debt Opportunities Fund, High Quality Short-Duration Bond Fund, Special Situations Fund and World Opportunity Overlay Fund (collectively, the “underlying Funds”) (see “Additional Information About the Funds' Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). In addition, the Fund may hold securities (particularly asset-backed securities) directly or through one or more subsidiaries or other entities. The Fund may have exposure to foreign and U.S. equity investments (which may include emerging country equities, both growth and value style equities and equities of any market capitalization), U.S. and foreign fixed income securities (including asset-backed securities and other fixed income securities of any credit quality and having any maturity or duration), the investment returns of commodities and, from time to time, other alternative asset classes.

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., foreign equity, U.S. equity, emerging country equity, emerging country debt, U.S. fixed income, foreign fixed income and commodities) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund's holdings of underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund's investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund's investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by those Funds may affect their performance more than if they were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund's investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Commodities Risk – To the extent an underlying Fund has exposure to global commodity markets, the value of its shares is affected by factors particular to the commodity markets and may fluctuate more than the value of shares of a fund with a broader range of investments.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of foreign currency holdings and investments denominated in foreign currencies, or that the U.S. dollar will decline in value relative to the foreign currency being hedged.

• Leveraging Risk – The use of reverse repurchase agreements and other derivatives and securities lending may cause the Fund's portfolio to be leveraged. Leverage increases the Fund's portfolio losses when the value of its investments decline.

• Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer's failure to meet its payment obligations or the market's expectation of a default, which may result from the downgrading of the issuer's credit rating. Below investment grade securities have speculative characteristics, and changes in economic conditions or other circumstances are more likely to impair the capacity of issuers to make principal and interest payments than is the case with issuers of investment grade securities.

• Counterparty Risk – The Fund runs the risk that the counterparty to an over-the-counter (OTC) derivatives contract or a borrower of the Fund's securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations.

• Real Estate Risk – To the extent an underlying Fund concentrates its assets in real estate-related investments, the value of its portfolio is subject to factors affecting the real estate industry and may fluctuate more than the value of a portfolio that consists of securities of companies in a broader range of industries.

• Short Sales Risk – The Fund runs the risk that an underlying Fund's loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors), the Fund is subject to the risk that these shareholders will disrupt the Fund's operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of broad-based indices and the Fund’s benchmark (which is a composite index computed by the Manager). Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table may be lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 11.73% (2Q2009)

Lowest Quarter: -10.19% (4Q2008)

Year-to-Date (as of 3/31/11): 2.98%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO STRATEGIC OPPORTUNITIES ALLOCATION FUND Class III, GMO Strategic Opportunities Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		7.96%	5.53%	6.72%	May 31, 2005
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		7.57%	3.86%	5.09%	May 31, 2005
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		5.42%	4.03%	5.08%	May 31, 2005
MSCI World Index	Class III	MSCI World Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.76%	2.43%	4.14%	May 31, 2005
Barclays Capital U.S. Aggregate Index	Class III	Barclays Capital U.S. Aggregate Index	(reflects no deduction for fees, expenses, or taxes)	6.54%	5.80%	5.26%	May 31, 2005
GMO Strategic Opportunities Allocation Index (Fund benchmark)	Class III	GMO Strategic Opportunities Allocation Index (Fund benchmark)		10.90%	3.63%	4.76%	May 31, 2005

GMO BENCHMARK-FREE ALLOCATION FUND

Investment objective

The Fund seeks a positive total return. The Fund does not have a particular securities market index as a benchmark and does not seek to outperform a particular index or blend of indices (i.e., the Fund seeks positive return, not “relative” return).

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	GMO BENCHMARK-FREE ALLOCATION FUND Class III, GMO Benchmark-Free Allocation Fund
Shareholder Fees Column [Text]	Class III
Purchase premium (as a percentage of amount invested)	0.09%
Redemption fee (as a percentage of amount redeemed)	0.09%

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

^[12]

Annual Fund Operating Expenses		GMO BENCHMARK-FREE ALLOCATION FUND Class III, GMO Benchmark-Free Allocation Fund
Operating Expenses Column [Text]		Class III
Management fee		none
Shareholder service fee		none
Other expenses		0.02%
Acquired fund fees and expenses (underlying fund expenses)	^[1]	0.57%
Total annual operating expenses		0.59%
Expense reimbursement	^[2]	(0.01%)
Total annual operating expenses after expense reimbursement (Fund and underlying fund expenses)		0.58%

[1]

[2]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO BENCHMARK-FREE ALLOCATION FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do not sell your shares
Class III, GMO Benchmark-Free Allocation Fund USD ($)		Class III	78	^[1]	252	442	991		Class III	68	^[1]	242	431	977

[1]	After reimbursement

Portfolio turnover

Principal investment strategies

The Fund is a fund of funds and invests primarily in shares of other GMO Funds, which may include the International Equity Funds, the U.S. Equity Funds, the Fixed Income Funds, Alpha Only Fund, Alternative Asset Opportunity Fund, Debt Opportunities Fund, High Quality Short-Duration Bond Fund, Special Situations Fund and World Opportunity Overlay Fund (collectively, the “underlying Funds”) (see “Additional Information About the Funds' Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). In addition, the Fund may hold securities (particularly asset-backed securities) directly or through one or more subsidiaries or other entities. The Fund implements its strategy by allocating its assets among asset classes represented by the underlying Funds (e.g., foreign equity, U.S. equity, emerging country equity, emerging country debt, foreign fixed income, U.S. fixed income and commodities). The Fund is not restricted in its exposure to any particular asset class, and at times may be substantially invested in underlying Funds that primarily invest in a single asset class (e.g., Fixed Income Funds). In addition, the Fund is not restricted in its exposure to any particular market. Although the Fund generally will have exposure to both emerging countries and developed countries, including the U.S., at times, it also may have substantial exposure to a particular country or type of country (e.g., emerging countries).

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., foreign equity, U.S. equity, emerging country equity, emerging country debt, foreign fixed income, U.S. fixed income and commodities) to select the underlying Funds in which the Fund invests and to decide how much to invest in each. The Manager changes the Fund's holdings of underlying Funds in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund's investments. The Manager's ability to shift investments among the underlying Funds is not subject to any limits. The Fund may invest substantially all of its assets in a few underlying Funds that primarily invest in the same asset class and may, at times, also invest a substantial portion of its assets in a single underlying Fund.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

The value of the Fund's shares changes with the value of the Fund's investments. Many factors can affect this value, and you may lose money by investing in the Fund. References to investments include those held directly by the Fund and indirectly through the Fund's investments in the underlying Funds. Some of the underlying Funds are non-diversified investment companies under the Investment Company Act of 1940, as amended, and therefore a decline in the market value of a particular security held by those Funds may affect their performance more than if they were diversified. The principal risks of investing in the Fund are summarized below. For a more complete discussion of these risks, including those risks to which the Fund is exposed as a result of its investments in the underlying Funds, see “Description of Principal Risks.”

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. An underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. Declines in stock market prices generally are likely to reduce the net asset value of the Fund's shares.

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund's investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Market Risk — Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening of credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Smaller Company Risk – Smaller companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, or may lack managers with experience or depend on a few key employees. The securities of companies with smaller market capitalizations often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than the securities of companies with larger market capitalization.

• Currency Risk – Fluctuations in exchange rates can adversely affect the market value of foreign currency holdings and investments denominated in foreign currencies.

• Credit Risk – The Fund runs the risk that the issuer or guarantor of a fixed income security or the obligor of an obligation underlying an asset-backed security will be unable or unwilling to satisfy its obligations to pay principal or interest payments or to otherwise honor its obligations. The market value of a fixed income security normally will decline as a result of the issuer's failure to meet its payment obligations or the market's expectation of a default, which may result from the downgrading of the issuer's credit rating. Below investment grade securities have speculative characteristics, and changes in economic conditions or other circumstances are more likely to impair the capacity of issuers to make principal and interest payments than is the case with issuers of investment grade securities.

• Short Sales Risk – The Fund runs the risk that an underlying Fund's loss on a short sale of securities that the underlying Fund does not own is unlimited.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index and the Consumer Price Index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table are lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 9.19% (2Q2009)

Lowest Quarter: -6.90% (4Q2008)

Year-to-Date (as of 3/31/11): 1.92%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO BENCHMARK-FREE ALLOCATION FUND Class III, GMO Benchmark-Free Allocation Fund	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	Incept.	Inception Date
Return Before Taxes	Class III	Return Before Taxes		4.72%	7.11%	12.00%	Jul. 23, 2003
Return After Taxes on Distributions	Class III	Return After Taxes on Distributions		4.19%	4.42%	9.27%	Jul. 23, 2003
Return After Taxes on Distributions and Sale of Fund Shares	Class III	Return After Taxes on Distributions and Sale of Fund Shares		3.14%	4.86%	9.18%	Jul. 23, 2003
MSCI World Index	Class III	MSCI World Index	(returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)	11.76%	2.43%	7.14%	Jul. 23, 2003
Consumer Price Index	Class III	Consumer Price Index	(reflects no deduction for fees, expenses, or taxes)	1.25%	2.18%	2.47%	Jul. 23, 2003

GMO ALPHA ONLY FUND

Investment objective

Seeks to outperform the Fund’s benchmark, the Citigroup 3-Month Treasury Bill Index.

Fees and expenses

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees GMO ALPHA ONLY FUND	Class III, GMO Alpha Only Fund	Class IV, GMO Alpha Only Fund
Shareholder Fees Column [Text]	Class III	Class IV
Purchase premium (as a percentage of amount invested)	none	none
Redemption fee (as a percentage of amount redeemed)	none	none

Annual Fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses GMO ALPHA ONLY FUND		Class III, GMO Alpha Only Fund	Class IV, GMO Alpha Only Fund
Operating Expenses Column [Text]		Class III	Class IV
Management fee		0.50%	0.50%
Shareholder service fee	^[1]	0.15%	0.10%
Other expenses		0.04%	0.04%
Acquired fund fees and expenses (underlying fund expenses)	^[2]	0.44%	0.44%
Total annual operating expenses		1.13%	1.08%
Expense reimbursement/waiver	^[1]	(0.46%)	(0.46%)
Total annual operating expenses after expense reimbursement/waiver (Fund and underlying fund expenses)		0.67%	0.62%

[1]

Grantham, Mayo, Van Otterloo & Co. LLC (the "Manager" or "GMO") has contractually agreed through at least June 30, 2012 to waive the Fund's shareholder service fee to the extent that the aggregate of any direct and indirect shareholder service fees borne by a class of shares of the Fund exceeds the applicable shareholder service fee set forth in the table above; provided, however, that the amount of this waiver will not exceed the applicable shareholder service fee set forth in the table above. In addition, subject to certain exclusions ("Excluded Fund Fees and Expenses"), the Manager has contractually agreed to reimburse the Fund to the extent the Fund's total annual operating expenses exceed 0.50% of the Fund's average daily net assets. Excluded Fund Fees and Expenses include shareholder service fees, underlying fund expenses, independent Trustee expenses, certain legal costs, investment-related costs (e.g., brokerage commissions and securities lending fees), extraordinary expenses, and other expenses described under "Expense Reimbursement" in this Prospectus. The Manager also has contractually agreed to reimburse the Fund for the amount of fees and expenses incurred indirectly by the Fund through its investment in other Funds of GMO Trust (excluding those Funds' Excluded Fund Fees and Expenses), subject to a maximum total reimbursement to the Fund of such fees and expenses equal to 0.50% of the Fund's average daily net assets. These expense limitations will continue through at least June 30, 2012, and may not be terminated prior to this date without the consent of the Fund's Board of Trustees.

[2]

The amounts have been restated to reflect current fees of certain underlying funds. These indirect expenses include, to the extent applicable, commission fees and purchase premiums and redemption fees ("transaction fees") charged by certain underlying funds. Net fees and expenses of underlying funds (before addition of transaction fees and as restated) and indirect transaction fees were 0.43% and 0.01%, respectively.

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same as those shown in the table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example GMO ALPHA ONLY FUND	Expense Example by, Year, Caption [Text]	Expense Example, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years	Expense Example, No Redemption, By Year, Caption [Text]	Expense Example, No Redemption, By Year, Column [Text]	1 Year		3 Years	5 Years	10 Years
GMO Trust	If you sell your shares							If you do no sell your shares
Class III, GMO Alpha Only Fund USD ($)		Class III	68	^[1]	320	591	1,365		Class III	68	^[1]	320	591	1,365
Class IV, GMO Alpha Only Fund USD ($)		Class IV	63	^[1]	304	564	1,308		Class IV	63	^[1]	304	564	1,308

[1]	After reimbursement

Portfolio turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During its fiscal year ended February 28, 2011, the Fund’s portfolio turnover rate (excluding short-term investments) was 89% of the average value of its portfolio.

Principal investment strategies

The Fund's investment program involves having both long and short investment exposures. The Fund seeks to construct a portfolio in which it has long investment exposure to asset classes and sub-asset classes that it expects will outperform relative to the asset classes and sub-asset classes to which it has short investment exposure.

To gain long investment exposure, the Fund invests primarily in shares of the U.S. Equity Funds and the International Equity Funds, and also may invest in shares of Emerging Country Debt Fund (collectively, the “underlying Funds”) (see “Additional Information About the Funds' Investment Strategies, Risks, and Expenses – Asset Allocation Funds”). In addition, the Fund may gain long investment exposure by investing in securities directly, rather than through the underlying Funds.

To gain short investment exposure, the Fund may use over-the-counter (“OTC”) and exchange-traded derivatives (including futures, swap contracts and currency forwards) and make short sales of securities (e.g., shares of exchange-traded funds), including short sales of securities the Fund does not own. The Fund is not limited in its use of derivatives or in the absolute face value of its derivatives positions, and, as a result, the Fund may be leveraged in relation to its assets.

The Manager uses multi-year forecasts of relative value and risk among asset classes (e.g., foreign equity, U.S. equity, emerging country equity and emerging country debt) and sub-asset classes (e.g., small- to mid-cap stocks in the foreign equity asset class and quality stocks in the U.S. equity and emerging country equity asset classes) to select the underlying Funds and securities in which the Fund invests or takes short positions and to decide how much to invest and/or short in each. The Manager changes the Fund's holdings in response to changes in its investment outlook and market valuations and may use redemption/purchase activity to rebalance the Fund's investments.

For cash management purposes, the Fund may invest in U.S. Treasury Fund and unaffiliated money market funds.

Principal risks of investing in the Fund

• Foreign Investment Risk – The market prices of many foreign securities fluctuate more than those of U.S. securities. Many foreign markets are less stable, smaller, less liquid and less regulated than U.S. markets, and the cost of trading in those markets often is higher than in U.S. markets. Foreign portfolio transactions generally involve higher commission rates, transfer taxes and custodial costs than similar transactions in the U.S. In addition, the Fund may be subject to foreign taxes on capital gains or other income payable on foreign securities, on transactions in those securities and on the repatriation of proceeds generated from those securities. Also, many foreign markets require a license for the Fund to invest directly in those markets, and the Fund is subject to the risk that it could not invest if its license were terminated or suspended. In some foreign markets, prevailing custody and trade settlement practices (e.g., the requirement to pay for securities prior to receipt) expose the Fund to credit and other risks with respect to participating brokers, custodians, clearing banks or other clearing agents, escrow agents and issuers. Further, adverse changes in investment regulations, capital requirements or exchange controls could adversely affect the value of the Fund's investments. These and other risks (e.g., nationalization, expropriation or other confiscation of assets of foreign issuers) tend to be greater for investments in companies tied economically to emerging countries, the economies of which tend to be more volatile than the economies of developed countries.

• Market Risk – Equity Securities – The market value of equity investments may decline due to factors affecting the issuing companies, their industries, or the economy and equity markets generally. If the Fund or an underlying Fund purchases equity investments at a discount from their value as determined by the Manager, the Fund runs the risk that the market prices of these investments will not increase to that value for a variety of reasons, one of which may be the Manager's overestimation of the value of those investments. The Fund or an underlying Fund also may purchase equity investments that typically trade at higher multiples of current earnings than other securities, and the market values of these investments often are more sensitive to changes in future earnings expectations than those other securities. In addition, the value of the Fund's shares will be adversely affected if the equity investments that are the subject of the Fund's short positions appreciate in value.

• Liquidity Risk – Low trading volume, lack of a market maker, large size of position or legal restrictions may limit or prevent a Fund from selling particular securities or unwinding derivative positions at desirable prices. The more less-liquid securities the Fund holds, the more likely it is to honor a redemption request in-kind.

• Market Risk – Fixed Income Securities – Typically, the market value of fixed income securities will decline during periods of rising interest rates and widening credit spreads.

• Market Risk – Asset-Backed Securities – Asset-backed securities are subject to severe credit downgrades, illiquidity, defaults and declines in market value.

• Leveraging Risk – The use of reverse repurchase agreements and other derivatives may cause the Fund's portfolio to be leveraged. The Fund and some underlying Funds are not limited in the extent to which they may use derivatives or in the absolute face value of their derivative positions. Leverage increases the Fund's portfolio losses when the value of its investments decline.

• Counterparty Risk – The Fund runs the risk that the counterparty to an OTC derivatives contract or a borrower of the Fund's securities will be unable or unwilling to make timely settlement payments or otherwise honor its obligations.

• Short Sales Risk – The Fund runs the risk that the Fund's loss on a short sale of securities that the Fund does not own is unlimited.

• Focused Investment Risk – Focusing investments in countries, regions, sectors or companies or in industries with high positive correlations to one another creates additional risk.

• Large Shareholder Risk – To the extent that shares of the Fund are held by large shareholders (e.g., institutional investors, asset allocation funds, or other GMO Funds), the Fund is subject to the risk that these shareholders will disrupt the Fund's operations by purchasing or redeeming Fund shares in large amounts and/or on a frequent basis.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s annual total returns from year to year for the periods indicated and by comparing the Fund’s average annual total returns for different calendar periods with those of a broad-based index. Purchase premiums and redemption fees are not reflected in the bar chart, but are reflected in the table; as a result, the returns in the table may be lower than the returns in the bar chart. Returns in the table reflect current purchase premiums and redemption fees. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant if you are tax-exempt or if you hold your Fund shares through tax-deferred arrangements (such as a 401(k) plan or individual retirement account). After-tax returns are shown for Class III shares only; after-tax returns for other classes will vary. Past performance (before and after taxes) is not an indication of future performance.

Annual Total Returns/Class III Shares Years Ending December 31

Highest Quarter: 7.39% (1Q2001)

Lowest Quarter: -4.81% (2Q2009)

Year-to-Date (as of 3/31/11): -1.43%

Average Annual Total Returns Periods Ending December 31, 2010

Average Annual Total Returns GMO ALPHA ONLY FUND	Column	Label	Index No Deduction For Fees, Expenses, Taxes [Text]	1 Year	5 Years	10 Years	Incept.	Inception Date
Return Before Taxes Class III, GMO Alpha Only Fund	Class III	Return Before Taxes		(4.02%)	1.95%	4.59%	4.18%	Jul. 29, 1994
Return Before Taxes Class IV, GMO Alpha Only Fund	Class IV	Return Before Taxes		(3.98%)			1.80%	Mar. 02, 2006
Return After Taxes on Distributions Class III, GMO Alpha Only Fund	Class III	Return After Taxes on Distributions		(4.02%)	(2.36%)	1.86%	1.64%	Jul. 29, 1994
Return After Taxes on Distributions and Sale of Fund Shares Class III, GMO Alpha Only Fund	Class III	Return After Taxes on Distributions and Sale of Fund Shares		(2.62%)	2.55%	3.77%	3.05%	Jul. 29, 1994
Citigroup 3-Month Treasury Bill Index Class III, GMO Alpha Only Fund	Class III	Citigroup 3-Month Treasury Bill Index	(reflects no deduction for fees, expenses, or taxes)	0.13%	2.30%	2.26%	3.44%	Jul. 29, 1994
Citigroup 3-Month Treasury Bill Index Class IV, GMO Alpha Only Fund	Class IV	Citigroup 3-Month Treasury Bill Index	(reflects no deduction for fees, expenses, or taxes)	0.13%			2.23%	Mar. 02, 2006

[1]	The Fund is the successor to GMO U.S. Core Fund, a former series of GMO Trust that had an investment objective and policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO U.S. Core Fund and reflects GMO U.S. Core Fund's annual operating expenses (0.02% higher than those of the Fund). As of the date of this Prospectus, no Class V shares of the Fund or its predecessor have been outstanding since February 11, 2005. Class V shares would be invested in the same portfolio of securities as Class III shares. Annual returns would principally differ to the extent Class V shares do not have the same expenses as Class III shares.
[2]	The Fund is the successor to GMO Intrinsic Value Fund, a former series of GMO Trust that had an investment objective and policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO Intrinsic Value Fund and reflects GMO Intrinsic Value Fund's annual operating expenses (0.02% higher than those of the Fund).
[3]	The Fund is the successor to GMO Growth Fund, a former series of GMO Trust that had an investment objective and policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO Growth Fund and reflects GMO Growth Fund's annual operating expenses (0.02% higher than those of the Fund).
[4]	The Fund is the successor to GMO Small/Mid Cap Value Fund, a former series of GMO Trust that had an investment objective and policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO Small/Mid Cap Value Fund and reflects GMO Small/Mid Cap Value Fund's annual operating expenses (0.02% higher than those of the Fund).
[5]	The Fund is the successor to GMO Small/Mid Cap Growth Fund, a former series of GMO Trust that had an investment objective and policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO Small/Mid Cap Growth Fund and reflects GMO Small/Mid Cap Growth Fund's annual operating expenses (0.02% higher than those of the Fund).
[6]	The Fund is the successor to GMO International Disciplined Equity Fund, a former series of GMO Trust that had an investment objective and policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO International Disciplined Equity Fund and reflects GMO International Disciplined Equity Fund's annual operating expenses (0.02% higher than those of the Fund).
[7]	The Fund is the successor to GMO International Growth Fund, a former series of GMO Trust that had an investment objective and policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO International Growth Fund and reflects GMO International Growth Fund's annual operating expenses (0.02% higher than those of the Fund).
[8]	Information on the Fund's return after taxes is unavailable prior to June 28, 1996, the date the Fund commenced operations as a registered investment company. Prior to that date, the Fund operated as a private investment pool with investment objectives, policies, and guidelines that were substantially the same as those of the Fund.
[9]	Information on the Fund's return after taxes is unavailable prior to June 30, 2000, the date the Fund commenced operations as a registered investment company. Prior to that date, the Fund operated as a private investment pool with investment objectives, policies, and guidelines that were substantially the same as those of the Fund.
[10]	The Fund's performance during 2001 was positively affected by approximately 7.50% as a result of the Fund's receipt of proceeds from litigation settlements relating to securities held by the Fund during prior periods and accounted for by the Fund during 2001.
[11]	The Fund commenced operations on June 28, 1996 with two classes of shares - Class I shares and Class II shares. No Class II shares were outstanding as of October 16, 1996. Class III shares were first issued on October 22, 1996. Class I shares converted to Class III shares on January 9, 1998. Class III performance information presented in the table represents Class II performance from June 28, 1996 to October 16, 1996, Class I performance from October 16, 1996 to October 21, 1996, and Class III performance thereafter. The performance information (before and after taxes) for all periods prior to June 30, 2002 was achieved prior to the change in the Fund's principal investment strategies, effective June 30, 2002.
[12]	The Fund's Board of Trustees has approved amendments to the Fund's management agreement and shareholder servicing agreement pursuant to which the Fund would pay the Manager an investment management fee equal to 0.65% of the average daily net assets and a shareholder service fee of 0.15% with respect to the Fund's Class III shares. The Fund currently pays no management or shareholder service fees directly to the Manager, but bears indirectly the management and shareholder service fees charged by the underlying Funds (defined below) in which the Fund invests. Under this new fee arrangement, the Manager would agree to reduce its management and shareholder service fees from the Fund by an amount equal to the management and shareholder service fees received by the Manager from the underlying Funds in respect of the Fund's investments. The new fee arrangements will go into effect only if the amended management agreement is approved by the Fund's shareholders.