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SEI INSTITUTIONAL INTERNATIONAL TRUST

International Equity Fund
Emerging Markets Equity Fund

Supplement Dated July 25, 2008
to the Class A Shares Prospectus Dated January 31, 2008

This Supplement provides new and additional information beyond that contained in the Class A Shares Prospectus, and should be read in conjunction with such Prospectus.

The Prospectus is hereby amended and supplemented to reflect the following change in the portfolio management of the International Equity and Emerging Markets Equity Funds.

Change in Sub-Adviser for the International Equity Fund

In the sub-section entitled "International Equity Fund" under the section entitled "Sub-Advisers and Portfolio Managers," the paragraphs relating to Capital Guardian Trust Company and Fuller & Thaler Asset Management, Inc. are hereby deleted and replaced with the following:

Principal Global Investors, LLC: Principal Global Investors, LLC (PGI), located at 801 Grand Avenue, Des Moines, Iowa 50392, serves as a Sub-Adviser to the International Equity Fund. A team of investment professionals manages the portion of the International Equity Fund's assets allocated to PGI. This team consists of Paul H. Blankenhagen, CFA, and Juliet Cohn. Each member of this team is responsible for implementing all security selection and portfolio construction decisions. Mr. Blankenhagen, a Portfolio Manager, joined PGI in 1992 as an equity analyst and was named a Portfolio Manager in 2000. He is responsible for leading the ongoing management of the international core, international diversified and international value equity portfolios. Ms. Cohn, a Portfolio Manager, joined PGI in 2003 as a portfolio manager and is responsible for co-managing core international equity portfolios with a primary focus on Europe.

There are no other changes in the portfolio management of the International Equity Fund.

Change in Sub-Adviser for the Emerging Markets Equity Fund

In the sub-section entitled "Emerging Markets Equity Fund" under the section entitled "Sub-Advisers and Portfolio Managers," the following paragraph is hereby added:

Artisan Partners Limited Partnership: Artisan Partners Limited Partnership (Artisan), located at 875 E. Wisconsin Avenue, Suite 800, Milwaukee, Wisconsin 53202, serves as a Sub-Adviser to the Emerging Markets Equity Fund. Maria Negrete-Gruson, CFA, serves as portfolio manager of the portion of the Emerging Markets Equity Fund's assets allocated to Artisan and is responsible for researching investment opportunities and the securities selection process. Ms. Negrete-Gruson is a Managing Director of Artisan and serves as the portfolio manager for Artisan's emerging markets portfolios. Prior to joining Artisan in 2006, she was the portfolio manager for DuPont Capital Management's emerging markets equity portfolios for more than five years.

There are no other changes in the portfolio management of the Emerging Markets Equity Fund.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

SEI-F-525 (7/08)

SEI INSTITUTIONAL INTERNATIONAL TRUST

International Equity Fund

Supplement Dated July 25, 2008
to the Class I Shares Prospectus Dated January 31, 2008

This Supplement provides new and additional information beyond that contained in the Class I Shares Prospectus, and should be read in conjunction with such Prospectus.

Change in Sub-Adviser for the International Equity Fund

The Prospectus is hereby amended and supplemented to reflect the following change in the portfolio management of the International Equity Fund. In the sub-section entitled "International Equity Fund" under the section entitled "Sub-Advisers and Portfolio Managers," the paragraphs relating to Capital Guardian Trust Company and Fuller & Thaler Asset Management, Inc. are hereby deleted and replaced with the following:

There are no other changes in the portfolio management of the International Equity Fund.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

SEI-F-526 (7/08)

SEI INSTITUTIONAL INTERNATIONAL TRUST

International Equity Fund
Emerging Markets Equity Fund

Supplement Dated July 25, 2008
to the Statement of Additional Information ("SAI") Dated January 31, 2008

This Supplement provides new and additional information beyond that contained in the SAI, and should be read in conjunction with such SAI.

The SAI is hereby amended and supplemented to reflect the following changes in the portfolio management of the International Equity and Emerging Markets Equity Funds.

Change in Sub-Adviser for the International Equity Fund

In the sub-section entitled "The Sub-Advisers" under the section entitled "The Adviser and the Sub-Advisers," the paragraphs relating to Capital Guardian Trust Company and Fuller & Thaler Asset Management, Inc. are hereby deleted and the following paragraph is hereby added:

PRINCIPAL GLOBAL INVESTORS, LLC—Principal Global Investors, LLC ("PGI") serves as a Sub-Adviser to a portion of the assets of the International Equity Fund. PGI, a Delaware limited liability company, was founded in 1879 and is a wholly-owned indirect subsidiary of Principal Financial Group, Inc., a Delaware corporation.

In addition, in the sub-section entitled "Portfolio Management" under the section entitled "The Adviser and Sub-Advisers," the following text relating to Capital Guardian Trust Company and Fuller & Thaler Asset Management, Inc. is hereby deleted and the following text is hereby added:

PGI

Compensation. SIMC pays PGI a fee based on the assets under management of the International Equity Fund as set forth in an investment sub-advisory agreement between PGI and SIMC. PGI pays its investment professionals out of its total revenues and other resources, including the sub-advisory fees earned with respect to the International Equity Fund. The following information relates to the period ended June 30, 2008.

PGI offers a globally competitive salary and incentive compensation plan that are evaluated annually relative to other top-tier asset management firms. Percentages of base salary versus performance bonus vary by position but are based on national market data and are consistent with industry standards. Total cash compensation is targeted to be consistent with the national averages. The primary driver for incentive compensation for its investment professionals is investment performance relative to appropriate client benchmarks and peer groups.

All investment staff members are eligible for incentive bonuses and broad-based stock option programs. In 2008, PGI introduced a supplemental profit sharing plan for select senior members of the investment team. This plan will provide additional long-term incentives in the form of restricted stock units tied specifically to growth and profitability of the equities group. Lastly, members of senior management, lead portfolio managers and other senior investment professionals such as research directors and senior analysts are also eligible for restricted stock grants.

The incentive compensation program is aligned with client goals and objectives. Typically, ninety percent of incentive compensation for portfolio managers and sixty percent of incentive compensation for analysts are determined directly on the basis of relative performance versus appropriate client benchmarks and peer groups. Results are measured over rolling one-year, two-year, and three-year periods consistent with appropriate risk management standards. The remaining portion of incentive compensation is based on a combination of individual results and overall firm results. Overall firm results are driven primarily by aggregate investment performance across asset classes relative to benchmarks and peers, in addition to financial results and new business development.

Ownership of Fund Shares. As of the end of the International Equity Fund's most recently completed fiscal year, PGI's portfolio managers did not beneficially own any shares of the International Equity Fund.

Other Accounts. As of December 31, 2007, in addition to the International Equity Fund, PGI's portfolio managers were responsible for the day-to-day management of certain other accounts, as follows:

	Registered Investment Companies				Other Pooled Investment Vehicles				Other Accounts
Portfolio Manager	Number of Accounts		Total Assets		Number of Accounts		Total Assets		Number of Accounts		Total Assets
Paul Blankenhagen		2	$	2,728,602,133		2	$	3,908,311,263		4	$	358,207,441
Juliet Cohn		2	$	2,728,602,133		2	$	3,908,311,263		4	$	358,207,441

None of the accounts listed above is subject to a performance-based advisory fee.

Conflicts of Interests. PGI's portfolio managers' management of other accounts (collectively, the "Other Accounts") may give rise to potential conflicts of interest in connection with their management of the International Equity Fund's investments, on the one hand, and the investments of the Other Accounts, on the other. The Other Accounts might have similar investment objectives as the International Equity Fund or hold, purchase or sell securities that are eligible to be held, purchased or sold by the International Equity Fund. PGI does not believe that these conflicts, if any, are material or, to the extent any such conflicts are material, PGI believes that it has designed policies and procedures to manage those conflicts in an appropriate way.

A potential conflict of interest may arise as a result of PGI's portfolio managers' day-to-day management of the International Equity Fund. Because of their positions with the International Equity Fund, the portfolio managers know the size, timing and possible market impact of International Equity Fund trades. It is theoretically possible that PGI's portfolio managers could use this information to the advantage of Other Accounts they manage and to the possible detriment of the International Equity Fund. However, PGI has adopted policies and procedures reasonably designed to allocate investment opportunities on a fair and equitable basis over time.

A potential conflict of interest may arise as a result of PGI's portfolio managers' management of the International Equity Fund and Other Accounts which, in theory, may allow them to allocate investment opportunities in a way that favors Other Accounts over the International Equity Fund. This conflict of interest may be exacerbated to the extent that PGI or its portfolio managers receive, or expect to receive, greater compensation from their management of the Other Accounts (many of which receive a base and incentive fee) than from the International Equity Fund. Notwithstanding this theoretical conflict of interest, it is PGI's policy to manage each account based on its investment objectives and related restrictions and, as discussed above, PGI has adopted policies and procedures reasonably designed to allocate investment opportunities on a fair and equitable basis over time and in a manner consistent with each account's investment objectives and related restrictions. For example, while PGI's portfolio managers may buy for Other Accounts securities that differ in identity or quantity from securities bought for the International Equity Fund, such securities might not be suitable for the International Equity Fund given their investment objectives and related restrictions.

There are no other changes in the portfolio management of the International Equity Fund.

Change in Sub-Adviser for the Emerging Markets Equity Fund

In the sub-section entitled "The Sub-Advisers" under the section entitled "The Adviser and the Sub-Advisers," the following paragraph is hereby added:

ARTISAN PARTNERS LIMITED PARTNERSHIP—Artisan Partners Limited Partnership ("Artisan") serves as a Sub-Adviser to a portion of the assets of the Emerging Markets Equity Fund. Artisan, a privately owned multidiscipline investment firm, was founded in 1994.

In addition, in the sub-section entitled "Portfolio Management" under the section entitled "The Adviser and Sub-Advisers," the following text is hereby added:

Artisan

Compensation. SIMC pays Artisan a fee based on the assets under management of the Emerging Markets Equity Fund as set forth in an investment sub-advisory agreement between Artisan and SIMC. Artisan pays its investment professionals out of its total revenues and other resources, including the sub-advisory fees earned with respect to the Emerging Markets Equity Fund. The following information relates to the period ended June 30, 2008.

An Artisan portfolio manager is compensated through a fixed base salary and a subjectively determined incentive bonus, the aggregate amount of which is a portion of a bonus pool which is tied to the firm's fee revenues generated by all accounts included within the manager's investment strategy, including the Emerging Markets Equity Fund. A portfolio manager is not compensated based on the performance of accounts, except to the extent that positive account performance results in increased investment management fees earned by Artisan based on assets under management. Artisan bases incentive bonuses on revenues earned with respect to the investment strategy, rather than on investment performance, because the firm believes that this method aligns its portfolio manager's interests more closely with the long-term interests of clients.

Artisan portfolio managers participate in group life, health, medical reimbursement and retirement plans that are generally available to all salaried employees of the firm. All senior professionals, including portfolio managers, have or are expected to have over a reasonable time, limited partnership interests in the firm.

Ownership of Fund Shares. As of the end of the Emerging Markets Equity Fund's most recently completed fiscal year, Artisan's portfolio manager did not beneficially own any shares of the Emerging Markets Equity Fund.

Other Accounts. As of June 30, 2008, in addition to the Emerging Markets Equity Fund, Artisan's portfolio manager was responsible for the day-to-day management of certain other accounts, as follows:

	Registered Investment Companies					Other Pooled Investment Vehicles					Other Accounts
Portfolio Manager	Number of Accounts			Total Assets		Number of Accounts			Total Assets		Number of Accounts			Total Assets
Maria Negrete-Gruson		1		$	97,000,329		0		$	0		0		$	0
		0	*	$	0		1	*	$	125,094,388		0	*	$	0

* Accounts listed above are subject to a performance-based advisory fee.

Conflicts of Interest. Artisan's emerging markets investment team, led by Maria Negrete-Gruson as manager, manages portfolios for multiple clients. These accounts may include accounts for registered investment companies, separate accounts (assets managed on behalf of institutions such as pension funds and foundations) and other private pooled investment vehicles. All investment accounts managed by Artisan within a single investment strategy are managed to a single model, such that all client portfolios within a particular investment strategy are essentially the same, provided that there may be certain exceptions resulting from: (i) client-directed restrictions and limitations; and (ii) cash flows into and out of such accounts. Because of these considerations, Artisan's emerging markets investment team may from time to time purchase securities, including initial public offerings, for one client account, but not for another client account for which that team is responsible. As a result, performance dispersion among client accounts within the emerging markets strategy may occur. In addition, some of the portfolios Artisan manages in its emerging markets strategy may have fee structures, including performance fees, that are or have the potential to be higher or lower, in some cases significantly higher or lower, than the fees paid by the Emerging Markets Equity Fund to Artisan. Although Artisan may have an incentive to manage the assets of accounts with performance-based fees differently from its other accounts, the firm believes that potential conflict is effectively controlled by Artisan's procedures to manage all clients within a particular strategy similarly regardless of fee structure.

Artisan's goal is to provide high quality investment services to all of its clients, while meeting its fiduciary obligation to treat all clients fairly. Artisan has adopted and implemented policies and procedures, including brokerage and trade allocation policies and procedures, that it believes address the potential conflicts associated with managing portfolios for multiple clients. In addition, Artisan monitors a variety of areas, including compliance with investment guidelines (to the extent applicable to the Artisan portion of the portfolio), the allocation of IPOs and compliance with the firm's Code of Ethics.

There are no other changes in the portfolio management of the Emerging Markets Equity Fund.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

SEI-F-527 (7/08)