N-CSRS

United States

Securities and Exchange Commission

Washington, D.C.  20549

Form N-CSR

Certified Shareholder Report of Registered Management Investment Companies

811-3375

(Investment Company Act File Number)

Federated GNMA Trust

_______________________________________________________________

(Exact Name of Registrant as Specified in Charter)

Federated Investors Funds

4000 Ericsson Drive

 Warrendale, PA 15086-7561

(Address of Principal Executive Offices)

(412) 288-1900

(Registrant's Telephone Number)

John W. McGonigle, Esquire

Federated Investors Tower

1001 Liberty Avenue

Pittsburgh, Pennsylvania 15222-3779

(Name and Address of Agent for Service)

(Notices should be sent to the Agent for Service)

Date of Fiscal Year End:  1/31/11

Date of Reporting Period:  Six months ended 7/31/10

Item 1.                      Reports to Stockholders

Federated GNMA Trust

SEMI-ANNUAL SHAREHOLDER REPORT

July 31, 2010

Institutional Shares
Institutional Service Shares

FINANCIAL HIGHLIGHTS
SHAREHOLDER EXPENSE EXAMPLE
PORTFOLIO OF INVESTMENTS SUMMARY TABLE
PORTFOLIO OF INVESTMENTS
STATEMENT OF ASSETS AND LIABILITIES
STATEMENT OF OPERATIONS
STATEMENT OF CHANGES IN NET ASSETS
NOTES TO FINANCIAL STATEMENTS
EVALUATION AND APPROVAL OF ADVISORY CONTRACT
VOTING PROXIES ON FUND PORTFOLIO SECURITIES
QUARTERLY PORTFOLIO SCHEDULE

Financial Highlights - Institutional Shares

(For a Share Outstanding Throughout Each Period)

	Six Months Ended (unaudited) 7/31/2010	Year Ended January 31,
		2010	2009	2008	2007	2006
Net Asset Value, Beginning of Period	$11.24	$11.02	$11.03	$10.76	$10.95	$11.23
Income From Investment Operations:
Net investment income	0.231	0.491	0.54	0.56	0.541	0.501
N et realized and unrealized gain (loss) on investments and futures contracts	0.26	0.24	(0.01)	0.28	(0.17)	(0.25)
TOTAL FROM INVESTMENT OPERATIONS	0.49	0.73	0.53	0.84	0.37	0.25
Less Distributions:
Distributions from net investment income	(0.25)	(0.51)	(0.54)	(0.57)	(0.56)	(0.53)
Net Asset Value, End of Period	$11.48	$11.24	$11.02	$11.03	$10.76	$10.95
Total Return2	4.39%	6.77%	4.99%	8.01%	3.51%	2.28%
Ratios to Average Net Assets:
Net expenses	0.68%3	0.65%	0.66%	0.65%	0.64%	0.64%
Net investment income	4.19%3	4.39%	4.84%	5.19%	5.04%	4.53%
Expense waiver/reimbursement4	0.02%3	0.00%5	0.02%	0.02%	0.04%	0.08%
Supplemental Data:
Net assets, end of period (000 omitted)	$392,872	$393,046	$388,396	$397,488	$441,101	$569,081
Portfolio turnover	45%	81%	82%	161%	243%	248%
Portfolio turnover (excluding purchases and sales from dollar-roll transactions)	16%	39%	21%	58%	61%	76%

1	Per share numbers have been calculated using the average shares method.
2	Based on net asset value. Total returns for periods of less than one year are not annualized.
3	Computed on an annualized basis.
4	This expense decrease is reflected in both the net expense and the net investment income ratios shown above.
5	Represents less than 0.01%.

See Notes which are an integral part of the Financial Statements

Semi-Annual Shareholder Report

1

Financial Highlights - Institutional Service Shares

(For a Share Outstanding Throughout Each Period)

	Six Months Ended (unaudited) 7/31/2010	Year Ended January 31,
		2010	2009	2008	2007	2006
Net Asset Value, Beginning of Period	$11.24	$11.02	$11.03	$10.76	$10.95	$11.23
Income From Investment Operations:
Net investment income	0.231	0.471	0.51	0.56	0.531	0.481
N et realized and unrealized gain (loss) on investments and futures contracts	0.25	0.24	0.002	0.26	(0.18)	(0.25)
TOTAL FROM INVESTMENT OPERATIONS	0.48	0.71	0.51	0.82	0.35	0.23
Less Distributions:
Distributions from net investment income	(0.24)	(0.49)	(0.52)	(0.55)	(0.54)	(0.51)
Net Asset Value, End of Period	$11.48	$11.24	$11.02	$11.03	$10.76	$10.95
Total Return3	4.31%	6.58%	4.83%	7.85%	3.35%	2.13%4
Ratios to Average Net Assets:
Net expenses	0.84%5	0.83%	0.82%	0.78%	0.79%	0.78%
Net investment income	4.04%5	4.19%	4.65%	5.05%	4.89%	4.39%
Expense waiver/reimbursement6	0.06%5	0.07%	0.08%	0.27%	0.28%	0.28%
Supplemental Data:
Net assets, end of period (000 omitted)	$62,219	$89,946	$61,535	$44,569	$47,122	$60,029
Portfolio turnover	45%	81%	82%	161%	243%	248%
Portfolio turnover (excluding purchases and sales from dollar-roll transactions)	16%	39%	21%	58%	61%	76%

1	Per share numbers have been calculated using the average shares method.
2	Represents less than $0.01.
3	Based on net asset value. Total returns for periods of less than one year are not annualized.
4	During the period, the Fund was reimbursed by an affiliated shareholder services provider, which had an impact of 0.01% on the total return.
5	Computed on an annualized basis.
6	This expense decrease is reflected in both the net expense and the net investment income ratios shown above.

See Notes which are an integral part of the Financial Statements

Semi-Annual Shareholder Report

2

Shareholder Expense Example (unaudited)

As a shareholder of the Fund, you incur ongoing costs, including management fees and to the extent applicable, distribution (12b-1) fees and/or shareholder services fees and other Fund expenses. This Example is intended to help you to understand your ongoing costs (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. It is based on an investment of $1,000 invested at the beginning of the period and held for the entire period from February 1, 2010 to July 31, 2010.

ACTUAL EXPENSES

The first section of the table below provides information about actual account values and actual expenses. You may use the information in this section, together with the amount you invested, to estimate the expenses that you incurred over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first section under the heading entitled “Expenses Paid During Period” to estimate the expenses attributable to your investment during this period.

HYPOTHETICAL EXAMPLE FOR COMPARISON PURPOSES

The second section of the table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. Thus, you should not use the hypothetical account values and expenses to estimate the actual ending account balance or your expenses for the period. Rather, these figures are required to be provided to enable you to compare the ongoing costs of investing in the Fund with other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds.

Semi-Annual Shareholder Report

3

Please note that the expenses shown in the table are meant to highlight your ongoing costs only. Therefore, the second section of the table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds.

	Beginning Account Value 2/1/2010	Ending Account Value 7/31/2010	Expenses Paid During Period1
Actual:
Institutional Shares	$1,000	$1,043.90	$3.45
Institutional Service Shares	$1,000	$1,043.10	$4.26
Hypothetical (assuming a 5% return before expenses):
Institutional Shares	$1,000	$1,021.42	$3.41
Institutional Service Shares	$1,000	$1,020.63	$4.21

1 Expenses are equal to the Fund's annualized net expense ratios, multiplied by the average account value over the period, multiplied by (181/365) (to reflect the one-half-year period). The annualized net expense ratios are as follows:

Institutional Shares	0.68%
Institutional Service Shares	0.84%

Semi-Annual Shareholder Report

4

Portfolio of Investments Summary Table (unaudited)

At July 31, 2010, the Fund's portfolio composition¹ was as follows:

Type of Investment	Percentage of Total Net Assets
GNMA Mortgage-Backed Securities	99.6%
Repurchase Agreements — Cash	5.9%
Repurchase Agreements — Collateral2	6.3%
Other Assets and Liabilities — Net3	(11.8)%
TOTAL	100.0%

1	See the Fund's Prospectus and Statement of Additional Information for a description of the types of securities in which the Fund invests.
2	Includes repurchase agreements purchased with cash collateral or proceeds received in dollar-roll transactions, as well as cash covering when-issued and delayed delivery transactions.
3	Assets, other than investments in securities, less liabilities. See Statement of Assets and Liabilities.

Semi-Annual Shareholder Report

5

Portfolio of Investments

July 31, 2010 (unaudited)

Principal Amount			Value
		Mortgage-Backed Securities – 97.1%
		Government National Mortgage Association – 97.1%;1
$5,000,000		4.000%, 8/20/2040	5,153,515
115,820,296	2	4.500%, 3/20/2039 - - 8/20/2040	122,020,036
112,170,450	2	5.000%, 10/15/2033 - - 8/20/2040	120,911,727
100,310,300		5.500%, 6/15/2033 - - 12/15/2038	109,363,832
59,083,162		6.000%, 11/15/2023 - - 7/20/2038	64,917,417
935,519		6.500%, 5/15/2027 - - 1/20/2032	1,049,759
8,722,972		7.000%, 6/15/2027 - - 1/15/2033	9,778,340
5,514,062		7.500%, 11/15/2027 - - 9/15/2032	6,328,567
2,010,549		8.000%, 11/15/2027 - - 8/15/2032	2,315,688
8,846		8.500%, 3/15/2030	9,991
		TOTAL MORTGAGE-BACKED SECURITIES (IDENTIFIED COST $411,717,651)	441,848,872
		Collateralized Mortgage Obligations – 2.5%
		Government National Mortgage Association – 2.5%
6,741,387	3	0.541%, 8/16/2036, REMIC 2006-47 FA	6,695,892
5,009,797	3	0.591%, 3/16/2037, REMIC 2007-9 AF	4,972,380
		TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS (IDENTIFIED COST $11,745,630)	11,668,272
		Repurchase Agreements – 12.2%
35,170,000	3	Interest in $7,990,000,000 joint repurchase agreement 0.22%, dated 7/30/2010 under which Bank of America N.A. will repurchase securities provided as collateral for $7,990,146,483 on 8/2/2010. The securities provided as collateral at the end of the period were U.S. Government Agency securities with various maturities to 4/15/2040 and the market value of those underlying securities was $8,189,364,232.	35,170,000
20,328,000	3,4	Repurchase agreement 0.22%, dated 7/21/2010 under which CS First Boston Corp. will repurchase a security provided as collateral for $20,331,603 on 8/19/2010. The security provided as collateral at the end of the period was a U.S. Government Agency security maturing 12/25/2039 and the market value of that underlying security was $33,434,859.	20,328,000
		TOTAL REPURCHASE AGREEMENTS (AT COST)	55,498,000
		TOTAL INVESTMENTS — 111.8% (IDENTIFIED COST $478,961,281)5	509,015,144
		OTHER ASSETS AND LIABILITIES - NET — (11.8)%6	(53,923,861)
		TOTAL NET ASSETS — 100%	$455,091,283

Semi-Annual Shareholder Report

6

1	Because of monthly principal payments, the average lives of the Government National Mortgage Association Modified Pass-Through Securities (based upon Federal Housing Authority/Veterans Administration historical experience) are less than the stated maturities.
2	All or a portion of these To Be Announced Securities (TBAs) are subject to dollar-roll transactions.
3	All or a portion of these securities are segregated pending settlement of dollar-roll transactions.
4	Although the repurchase date is more than seven days after the date of purchase, the Fund has the right to terminate the repurchase agreement at any time with seven-days' notice.
5	The cost of investments for federal tax purposes amounts to $478,127,180.
6	Assets, other than investments in securities, less liabilities. See Statement of Assets and Liabilities. A significant portion of this balance is the result of dollar-roll transactions as of July 31, 2010.

Note: The categories of investments are shown as a percentage of total net assets at July 31, 2010.

Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below:

Level 1 — quoted prices in active markets for identical securities

Level 2 — other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.)

Level 3 — significant unobservable inputs (including the Fund's own assumptions in determining the fair value of investments)

The inputs or methodology used for valuing securities are not an indication of the risk associated with investing in those securities.

As of July 31, 2010, all investments of the Fund utilized Level 2 inputs in valuing the Fund's assets carried at fair value.

The following acronym is used throughout this portfolio:

REMIC — Real Estate Mortgage Investment Conduit

See Notes which are an integral part of the Financial Statements

Semi-Annual Shareholder Report

7

Statement of Assets and Liabilities

July 31, 2010 (unaudited)

Assets:
Investments in repurchase agreements	$55,498,000
Investments in securities	453,517,144
Total investments in securities, at value (identified cost $478,961,281)		$509,015,144
Cash		797
Income receivable		1,715,952
Receivable for investments sold		26,313,460
Receivable for shares sold		209,617
TOTAL ASSETS		537,254,970
Liabilities:
Payable for investments purchased	80,822,109
Payable for shares redeemed	696,820
Income distribution payable	499,001
Payable for shareholder services fee (Note 5)	69,087
Accrued expenses	76,670
TOTAL LIABILITIES		82,163,687
Net assets for 39,633,493 shares outstanding		$455,091,283
Net Assets Consist of:
Paid-in capital		$442,684,567
Net unrealized appreciation of investments		30,053,863
Accumulated net realized loss on investments and futures contracts		(17,173,895)
Distributions in excess of net investment income		(473,252)
TOTAL NET ASSETS		$455,091,283
Net Asset Value, Offering Price and Redemption Proceeds Per Share
Institutional Shares:
$392,872,061 ÷ 34,214,859 shares outstanding, no par value, unlimited shares authorized		$11.48
Institutional Service Shares:
$62,219,222 ÷ 5,418,634 shares outstanding, no par value, unlimited shares authorized		$11.48

See Notes which are an integral part of the Financial Statements

Semi-Annual Shareholder Report

8

Statement of Operations

Six Months Ended July 31, 2010 (unaudited)

Investment Income:
Interest		$10,541,958
Expenses:
Investment adviser fee (Note 5)	$864,861
Administrative personnel and services fee (Note 5)	168,862
Custodian fees	23,583
Transfer and dividend disbursing agent fees and expenses	87,641
Directors'/Trustees' fees	6,423
Auditing fees	11,669
Legal fees	2,894
Portfolio accounting fees	82,046
Distribution services fee — Institutional Service Shares (Note 5)	17,190
Shareholder services fee — Institutional Shares (Note 5)	164,281
Shareholder services fee — Institutional Service Shares (Note 5)	52,762
Account administration fee — Institutional Shares	5,584
Account administration fee — Institutional Service Shares	32,174
Share registration costs	24,710
Printing and postage	18,032
Insurance premiums	2,523
Miscellaneous	19,917
TOTAL EXPENSES	1,585,152

Semi-Annual Shareholder Report

9

Statement of Operations — continued

Waivers and Reimbursements (Note 5):
Waiver of administrative personnel and services fee	$(4,322)
Waiver of distribution services fee — Institutional Service Shares	(17,190)
Reimbursement of shareholder services fee —  Institutional Shares	(32,268)
Reimbursement of shareholder services fee —  Institutional Service Shares	(3,163)
TOTAL WAIVERS AND REIMBURSEMENTS		$(56,943)
Net expenses			$1,528,209
Net investment income			9,013,749
Realized and Unrealized Gain (Loss) on Investments and Futures Contracts:
Net realized gain on investments			4,989,726
Net realized gain on futures contracts			70,636
Net change in unrealized appreciation of investments			4,464,735
Net change in unrealized appreciation of futures contracts			(7,346)
Net realized and unrealized gain on investments and futures contracts			9,517,751
Change in net assets resulting from operations			$18,531,500

See Notes which are an integral part of the Financial Statements

Semi-Annual Shareholder Report

10

Statement of Changes in Net Assets

	Six Months Ended (unaudited) 7/31/2010	Year Ended 1/31/2010
Increase (Decrease) in Net Assets
Operations:
Net investment income	$9,013,749	$20,440,726
Net realized gain on investments and futures contracts	5,060,362	1,341,429
Net change in unrealized appreciation/depreciation of investments and futures contracts	4,457,389	9,217,784
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS	18,531,500	30,999,939
Distributions to Shareholders:
Distributions from net investment income
Institutional Shares	(8,046,645)	(18,491,607)
Institutional Service Shares	(1,471,788)	(2,915,872)
CHANGE IN NET ASSETS RESULTING FROM DISTRIBUTIONS TO SHAREHOLDERS	(9,518,433)	(21,407,479)
Share Transactions:
Proceeds from sale of shares	69,982,362	145,602,176
Net asset value of shares issued to shareholders in payment of distributions declared	6,512,670	14,075,774
Cost of shares redeemed	(108,408,497)	(141,209,686)
CHANGE IN NET ASSETS RESULTING FROM SHARE TRANSACTIONS	(31,913,465)	18,468,264
Change in net assets	(22,900,398)	28,060,724
Net Assets:
Beginning of period	477,991,681	449,930,957
End of period (including undistributed (distributions in excess of) net investment income of $(473,252) and $31,432, respectively)	$455,091,283	$477,991,681

See Notes which are an integral part of the Financial Statements

Semi-Annual Shareholder Report

11

Notes to Financial Statements

July 31, 2010 (unaudited)

1. ORGANIZATION

Federated GNMA Trust (the “Fund”) is registered under the Investment Company Act of 1940, as amended (the “Act”), as a diversified, open-end management investment company. The Fund offers two classes of shares: Institutional Shares and Institutional Service Shares. All shares of the Fund have equal rights with respect to voting, except on class-specific matters. The investment objective of the Fund is current income.

2. SIGNIFICANT ACCOUNTING POLICIES

The following is a summary of significant accounting policies consistently followed by the Fund in the preparation of its financial statements. These policies are in conformity with U.S. generally accepted accounting principles (GAAP).

Investment Valuation

In calculating its net asset value (NAV), the Fund generally values investments as follows:

• Fixed-income securities acquired with remaining maturities greater than 60 days are fair valued using price evaluations provided by a pricing service approved by the Board of Trustees (the “Trustees”).
• Fixed-income securities acquired with remaining maturities of 60 days or less are valued at their cost (adjusted for the accretion of any discount or amortization of any premium).
• Derivative contracts listed on exchanges are valued at their reported settlement or closing price.
• Over-the-counter (OTC) derivative contracts are fair valued using price evaluations provided by a pricing service approved by the Trustees.
• Shares of other mutual funds are valued based upon their reported NAVs.

If the Fund cannot obtain a price or price evaluation from a pricing service for an investment, the Fund may attempt to value the investment based upon the mean of bid and asked quotations or fair value the investment based on price evaluations, from one or more dealers. If any price, quotation, price evaluation or other pricing source is not readily available when the NAV is calculated, the Fund uses the fair value of the investment determined in accordance with the procedures described below. There can be no assurance that the Fund could purchase or sell an investment at the price used to calculate the Fund's NAV.

Fair Valuation and Significant Events Procedures

The Trustees have authorized the use of pricing services to provide evaluations of the current fair value of certain investments for purposes of calculating the NAV. Factors considered by pricing services in evaluating an investment include the yields or prices of investments of comparable quality, coupon, maturity, call rights and other potential prepayments, terms and type, reported transactions, indications as to values from dealers and general market conditions. Some pricing services provide a single price evaluation reflecting the bid-side of the market for an investment (a “bid” evaluation). Other pricing services offer both bid evaluations and price evaluations indicative of a price between the prices bid and asked for the investment (a “mid” evaluation). The Fund normally uses bid evaluations for U.S. Treasury and Agency securities and mortgage-backed securities. The Fund normally uses mid evaluations for other types of fixed-income securities and OTC derivative contracts. In the event that market quotations and price evaluations are not available for an investment, the fair value of the investment is determined in accordance with procedures adopted by the Trustees.

Semi-Annual Shareholder Report

12

The Trustees also have adopted procedures requiring an investment to be priced at its fair value whenever the Adviser determines that a significant event affecting the value of the investment has occurred between the time as of which the price of the investment would otherwise be determined and the time as of which the NAV is computed. An event is considered significant if there is both an affirmative expectation that the investment's value will change in response to the event and a reasonable basis for quantifying the resulting change in value. Examples of significant events that may occur after the close of the principal market on which a security is traded, or after the time of a price evaluation provided by a pricing service or a dealer, include:

• With respect to price evaluations of fixed-income securities determined before the close of regular trading on the NYSE, actions by the Federal Reserve Open Market Committee and other significant trends in U.S. fixed-income markets;
• Political or other developments affecting the economy or markets in which an issuer conducts its operations or its securities are traded; and
• Announcements concerning matters such as acquisitions, recapitalizations, litigation developments, a natural disaster affecting the issuer's operations or regulatory changes or market developments affecting the issuer's industry.

The Fund may seek to obtain more current quotations or price evaluations from alternative pricing sources. If a reliable alternative pricing source is not available, the Fund will determine the fair value of the investment using another method approved by the Trustees.

Repurchase Agreements

It is the policy of the Fund to require the other party to a repurchase agreement to transfer to the Fund's custodian or sub-custodian eligible securities or cash with a market value (after transaction costs) at least equal to the repurchase price to be paid under the repurchase agreement. The eligible securities are transferred to accounts with the custodian or sub-custodian in which the Fund holds a “securities entitlement” and exercises “control” as those terms are defined in the Uniform Commercial Code. The Fund has established procedures for monitoring the market value of the transferred securities and requiring the transfer of additional eligible securities if necessary to equal at least the repurchase price. These procedures also allow the other party to require securities to be transferred from the account to the extent that their market value exceeds the repurchase price or in exchange for other eligible securities of equivalent market value.

The insolvency of the other party or other failure to repurchase the securities may delay the disposition of the underlying securities or cause the Fund to receive less than the full repurchase price. Under the terms of the repurchase agreement, any amounts received by the Fund in excess of the repurchase price and related transaction costs must be remitted to the other party.

The Fund may enter into repurchase agreements in which eligible securities are transferred into joint trading accounts maintained by the custodian or sub-custodian for investment companies and other clients advised by the Fund's Adviser and its affiliates. The Fund will participate on a pro rata basis with the other investment companies and clients in its share of the securities transferred under such repurchase agreements and in its share of proceeds from any repurchase or other disposition of such securities.

Semi-Annual Shareholder Report

13

Investment Income, Gains and Losses, Expenses and Distributions

Investment transactions are accounted for on a trade-date basis. Realized gains and losses from investment transactions are recorded on an identified-cost basis. Interest income and expenses are accrued daily. Dividend income and distributions to shareholders are recorded on the ex-dividend date. Distributions of net investment income are declared daily and paid monthly. Non-cash dividends included in dividend income, if any, are recorded at fair value. Investment income, realized and unrealized gains and losses, and certain fund-level expenses are allocated to each class based on relative average daily net assets, except that each class may bear certain expenses unique to that class such as distribution services, shareholder services and account administration fees. Dividends are declared separately for each class. No class has preferential dividend rights; differences in per share dividend rates are generally due to differences in separate class expenses.

Premium and Discount Amortization/Paydown Gains and Losses

All premiums and discounts on fixed-income securities, other than mortgage-backed securities, are amortized/accreted for financial statement purposes. Gains and losses realized on principal payment of mortgage-backed securities (paydown gains and losses) are classified as part of investment income.

Federal Taxes

It is the Fund's policy to comply with the Subchapter M provision of the Internal Revenue Code (the “Code”) and to distribute to shareholders each year substantially all of its income. Accordingly, no provision for federal income tax is necessary. As of and during the six months ended July 31, 2010, the Fund did not have a liability for any uncertain tax positions. The Fund recognizes interest and penalties, if any, related to tax liabilities as income tax expense in the Statement of Operations. As of July 31, 2010, tax years 2007 through 2010 remain subject to examination by the Fund's major tax jurisdictions, which include the United States of America and the Commonwealth of Massachusetts.

When-Issued and Delayed Delivery Transactions

The Fund may engage in when-issued or delayed delivery transactions. The Fund records when-issued securities on the trade date and maintains security positions such that sufficient liquid assets will be available to make payment for the securities purchased. Securities purchased on a when-issued or delayed delivery basis are marked to market daily and begin earning interest on the settlement date. Losses may occur on these transactions due to changes in market conditions or the failure of counterparties to perform under the contract.

The Fund may transact in TBAs. As with other delayed delivery transactions, a seller agrees to issue TBAs at a future date. However, the seller does not specify the particular securities to be delivered. Instead, the Fund agrees to accept any security that meets specified terms such as issuer, interest rate and terms of underlying mortgages. The Fund records TBAs on the trade date utilizing information associated with the specified terms of the transaction as opposed to the specific mortgages. TBAs are marked to market daily and begin earning interest on the settlement date. Losses may occur due to the fact that the actual underlying mortgages received may be less favorable than those anticipated by the Fund.

Semi-Annual Shareholder Report

14

Futures Contracts

The Fund purchases and sells financial futures contracts to manage cash flows, enhance yield, manage duration and to potentially reduce transaction costs. Upon entering into a financial futures contract with a broker, the Fund is required to deposit in a segregated account a specified amount of cash or U.S. government securities. Futures contracts are valued daily and unrealized gains or losses are recorded in a “variation margin” account. Daily, the Fund receives from or pays to the broker a specified amount of cash based upon changes in the variation margin account. When a contract is closed, the Fund recognizes a realized gain or loss. Futures contracts have market risks, including the risk that the change in the value of the contract may not correlate with the changes in the value of the underlying securities. There is minimal counterparty risk to the Fund since futures are exchange traded and the exchange's clearinghouse, as counterparty to all exchange traded futures, guarantees the futures against default.

At July 31, 2010, the Fund had no outstanding futures contracts.

Dollar-Roll Transactions

The Fund may engage in dollar-roll transactions in which the Fund sells mortgage-backed securities with a commitment to buy similar (same type, coupon and maturity), but not identical mortgage-backed securities on a future date at a lower price. Normally, one or both securities involved are TBA mortgage-backed securities. The Fund treats dollar-roll transactions as purchases and sales. Dollar-rolls are subject to interest rate risks and credit risks.

Additional Disclosure Related to Derivative Instruments

The Effect of Derivative Instruments on the Statement of Operations for the Six Months Ended July 31, 2010

Amount of Realized Gain or (Loss) on Derivatives Recognized in Income
	Futures
Interest rate contracts	$70,636

Change in Unrealized Appreciation or (Depreciation) on Derivatives Recognized in Income
	Futures
Interest rate contracts	$(7,346)

Other

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts of assets, liabilities, expenses and revenues reported in the financial statements. Actual results could differ from those estimated.

Semi-Annual Shareholder Report

15

3. SHARES OF BENEFICIAL INTEREST

The following tables summarize share activity:

	Six Months Ended 7/31/2010		Year Ended 1/31/2010
Institutional Shares:	Shares	Amount	Shares	Amount
Shares sold	5,666,215	$64,368,953	9,036,303	$100,887,872
Shares issued to shareholders in payment of distributions declared	472,948	5,346,973	1,062,945	11,884,703
Shares redeemed	(6,889,664)	(77,591,322)	(10,392,651)	(116,325,217)
NET CHANGE RESULTING FROM INSTITUTIONAL SHARE TRANSACTIONS	(750,501)	$(7,875,396)	(293,403)	$(3,552,642)

	Six Months Ended 7/31/2010		Year Ended 1/31/2010
Institutional Service Shares:	Shares	Amount	Shares	Amount
Shares sold	498,276	$5,613,409	4,006,746	$44,714,304
Shares issued to shareholders in payment of distributions declared	103,223	1,165,697	195,874	2,191,071
Shares redeemed	(2,739,560)	(30,817,175)	(2,230,729)	(24,884,469)
NET CHANGE RESULTING FROM INSTITUTIONAL SERVICE SHARE TRANSACTIONS	(2,138,061)	$(24,038,069)	1,971,891	$22,020,906
NET CHANGE RESULTING FROM FUND SHARE TRANSACTIONS	(2,888,562)	$(31,913,465)	1,678,488	$18,468,264

4. FEDERAL TAX INFORMATION

At July 31, 2010, the cost of investments for federal tax purposes was $478,127,180. The net unrealized appreciation of investments for federal tax purposes was $30,887,964. This consists of net unrealized appreciation from investments for those securities having an excess of value over cost of $30,965,416 and net unrealized depreciation from investments for those securities having an excess of cost over value of $77,452.

At January 31, 2010, the Fund had a capital loss carryforward of $22,683,800 which will reduce the Fund's taxable income arising from future net realized gains on investments, if any, to the extent permitted by the Code and thus will reduce the amount of distributions to shareholders which would otherwise be necessary to relieve the Fund of any liability for federal income tax. Pursuant to the Code, such capital loss carryforward will expire as follows:

Expiration Year	Expiration Amount
2012	$909,063
2013	$7,078,438
2014	$1,243,098
2015	$9,522,017
2016	$3,931,184

Semi-Annual Shareholder Report

16

5. INVESTMENT ADVISER FEE AND OTHER TRANSACTIONS WITH AFFILIATES

Investment Adviser Fee

Federated Investment Management Company is the Fund's investment adviser (the “Adviser”). The advisory agreement between the Fund and the Adviser provides for an annual fee equal to 0.40% of the Fund's average daily net assets. Subject to the terms described in the Expense Limitation note, the Adviser may voluntarily choose to waive any portion of its fee.

Administrative Fee

Federated Administrative Services (FAS), under the Administrative Services Agreement, provides the Fund with administrative personnel and services. The fee paid to FAS is based on the average aggregate daily net assets of certain Federated funds as specified below:

Administrative Fee	Average Aggregate Daily Net Assets of the Federated Funds
0.150%	on the first $5 billion
0.125%	on the next $5 billion
0.100%	on the next $10 billion
0.075%	on assets in excess of $20 billion

The administrative fee received during any fiscal year shall be at least $150,000 per portfolio and $40,000 per each additional class of Shares. Subject to the terms described in the Expense Limitation note, FAS may voluntarily choose to waive any portion of its fee. For the six months ended July 31, 2010, the net fee paid to FAS was 0.076% of average daily net assets of the Fund. FAS waived $4,322 of its fee.

Distribution Services Fee

The Fund has adopted a Distribution Plan (the “Plan”) pursuant to Rule 12b-1 under the Act. Under the terms of the Plan, the Fund will compensate Federated Securities Corp. (FSC), the principal distributor, from the daily net assets of the Fund's Institutional Service Shares to finance activities intended to result in the sale of these shares. The Plan provides that the Fund may incur distribution expenses at 0.05% of average daily net assets, annually, to compensate FSC. Subject to the terms described in the Expense Limitation note, FSC may voluntarily choose to waive any portion of its fee. For the six months ended July 31, 2010, FSC voluntarily waived its entire fee of $17,190. When FSC receives fees, it may pay some or all of them to financial intermediaries whose customers purchase shares.

Shareholder Services Fee

The Fund may pay fees (“Service Fees”) up to 0.25% of the average daily net assets of the Fund's Institutional Shares and Institutional Service Shares to financial intermediaries or to Federated Shareholder Services Company (FSSC) for providing services to shareholders and maintaining shareholder accounts. Subject to the terms described in the Expense Limitation note, FSSC may voluntarily reimburse the Fund for Service Fees. For the six months ended
July 31, 2010, FSSC voluntarily reimbursed $35,431 of Service Fees. For the six months ended
July 31, 2010, FSSC did not receive any fees paid by the Fund.

Semi-Annual Shareholder Report

17

Expense Limitation

The Adviser and its affiliates (which may include FSC, FAS and FSSC) have voluntarily agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses (as shown in the financial highlights) paid by the Fund's Institutional Shares and Institutional Service Shares (after the voluntary waivers and/or reimbursements) will not exceed 0.68% and 0.84%, (the “Fee Limit”), respectively, through the later of (the “Termination Date”): (a) March 31, 2011; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Trustees.

General

Certain Officers and Trustees of the Fund are Officers and Directors or Trustees of the above companies.

6. LINE OF CREDIT

The Fund participates in a $100,000,000 unsecured, uncommitted revolving line of credit (LOC) agreement with PNC Bank. The LOC was made available for extraordinary or emergency purposes, primarily for financing redemption payments. Borrowings are charged interest at a rate offered to the Fund by PNC Bank at the time of the borrowing. As of July 31, 2010, there were no outstanding loans. During the six months ended July 31, 2010, the Fund did not utilize the LOC.

7. INTERFUND LENDING

Pursuant to an Exemptive Order issued by the Securities and Exchange Commission, the Fund, along with other funds advised by subsidiaries of Federated Investors, Inc., may participate in an interfund lending program. This program provides an alternative credit facility allowing the Fund to borrow from other participating affiliated funds. As of July 31, 2010, there were no outstanding loans. During the six months ended July 31, 2010, the program was not utilized.

8. Legal Proceedings

Since October 2003, Federated Investors, Inc. and related entities (collectively, “Federated”), and various Federated sponsored mutual funds (“Federated Funds”) have been named as defendants in several class action lawsuits now pending in the United States District Court for the District of Maryland. The lawsuits were purportedly filed on behalf of people who purchased, owned and/or redeemed shares of certain Federated Funds during specified periods beginning November 1, 1998. The suits are generally similar in alleging that Federated engaged in illegal and improper trading practices including market timing and late trading in concert with certain institutional traders, which allegedly caused financial injury to the mutual fund shareholders. Federated without admitting the validity of any claim has reached a preliminary settlement with the Plaintiffs in these cases. Any settlement would have to be approved by the Court. Federated entities have also been named as defendants in several additional lawsuits that are now pending in the United States District Court for the Western District of Pennsylvania. These lawsuits have been consolidated into a single action alleging excessive advisory fees involving one of the Federated Funds. The Board of the Federated Funds retained the law firm of Dickstein Shapiro LLP to represent the Federated Funds in these lawsuits. Federated and the Federated Funds, and their respective counsel, have been defending this litigation, and none of the Federated Funds remains a defendant in any of the lawsuits. Additional lawsuits based upon similar allegations may be filed in the future. The potential impact of these lawsuits, all of which seek monetary damages, attorneys' fees and Semi-Annual Shareholder Report

18

expenses, and future potential similar suits is uncertain. Although we do not believe that these lawsuits will have a material adverse effect on the Federated Funds, there can be no assurance that these suits, ongoing adverse publicity and/or other developments resulting from the allegations in these matters will not result in increased redemptions, or reduced sales, of shares of the Federated Funds or other adverse consequences for the Federated Funds.

9. Subsequent events

Management has evaluated subsequent events through the date the financial statements were issued, and determined that no events have occurred that require additional disclosure.

Semi-Annual Shareholder Report

19

Evaluation and Approval of Advisory Contract - May 2010

Federated GNMA Trust (the “Fund”)

The Fund's Board reviewed the Fund's investment advisory contract at meetings held in May 2010. The Board's decision regarding the contract reflects the exercise of its business judgment on whether to continue the existing arrangements.

In this connection, the Federated funds' Board had previously appointed a Senior Officer, whose duties include specified responsibilities relating to the process by which advisory fees are to be charged to a Federated fund. The Senior Officer has the authority to retain consultants, experts, or staff as may be reasonably necessary to assist in the performance of his duties, reports directly to the Board, and may be terminated only with the approval of a majority of the independent members of the Board. The Senior Officer prepared and furnished to the Board an independent, written evaluation that covered topics discussed below. The Board considered that evaluation, along with other information, in deciding to approve the advisory contract.

During its review of the contract, the Board considered compensation and benefits received by the Adviser. This included the fees received for services provided to the Fund by other entities in the Federated organization and research services (if any) received by the Adviser from brokers that execute Federated fund trades, as well as advisory fees. The Board is also familiar with and considered judicial decisions concerning allegedly excessive investment advisory fees, which have indicated that the following factors may be relevant to an Adviser's fiduciary duty with respect to its receipt of compensation from a fund: the nature and quality of the services provided by the Adviser, including the performance of the fund; the Adviser's cost of providing the services; the extent to which the Adviser may realize “economies of scale” as a fund grows larger; any indirect benefits that may accrue to the Adviser and its affiliates as a result of the Adviser's relationship with a fund; performance and expenses of comparable funds; and the extent to which the independent Board members are fully informed about all facts the Board deems relevant bearing on the Adviser's services and fees. The Board further considered management fees (including any components thereof) charged to institutional and other clients of the Adviser for what might be viewed as like services, and the cost to the Adviser and its affiliates of supplying services pursuant to the management fee agreements, excluding any intra-corporate profit and profit margins of the Adviser and its affiliates for supplying such services. The Board was aware of these factors and was guided by them in its review of the Fund's advisory contract to the extent it considered them to be appropriate and relevant, as discussed further below.

Semi-Annual Shareholder Report

20

The Board considered and weighed these circumstances in light of its substantial accumulated experience in governing the Fund and working with Federated on matters relating to the Federated funds, and was assisted in its deliberations by independent legal counsel. Throughout the year, the Board has requested and received substantial and detailed information about the Fund and the Federated organization that was in addition to the extensive materials that comprise and accompany the Senior Officer's evaluation. Federated provided much of this information at each regular meeting of the Board, and furnished additional reports in connection with the particular meeting at which the Board's formal review of the advisory contract occurred. Between regularly scheduled meetings, the Board also received information on particular matters as the need arose. Thus, the Board's consideration of the advisory contract included review of the Senior Officer's evaluation, accompanying data and additional reports covering such matters as: the Adviser's investment philosophy, revenue, profitability, personnel and processes; investment and operating strategies; the Fund's short- and long-term performance (in absolute terms, both on a gross basis and net of expenses, as well as in relationship to its particular investment program and certain competitor or “peer group” funds and/or other benchmarks, as appropriate), and comments on the reasons for performance; the Fund's investment objectives; the Fund's expenses (including the advisory fee itself and the overall expense structure of the Fund, both in absolute terms and relative to similar and/or competing funds, with due regard for contractual or voluntary expense limitations); the use and allocation of brokerage commissions derived from trading the Fund's portfolio securities (if any); and the nature, quality and extent of the advisory and other services provided to the Fund by the Adviser and its affiliates. The Board also considered the preferences and expectations of Fund shareholders and their relative sophistication; the continuing state of competition in the mutual fund industry and market practices; the range of comparable fees for similar funds in the mutual fund industry; the Fund's relationship to the Federated family of funds which include a comprehensive array of funds with different investment objectives, policies and strategies which are available for exchange without the incurrence of additional sales charges; compliance and audit reports concerning the Federated funds and the Federated companies that service them (including communications from regulatory agencies), as well as Federated's responses to any issues raised therein; and relevant developments in the mutual fund industry and how the Federated funds and/or Federated are responding to them. The Board's evaluation process is evolutionary. The criteria considered and the emphasis placed on relevant criteria change in recognition of changing circumstances in the mutual fund marketplace. With respect to the Fund's performance and expenses in particular, the Board has found the use of comparisons to other mutual funds with comparable investment programs to be relevant, given the high degree of competition in the mutual fund business. The Board focused on comparisons with other similar Semi-Annual Shareholder Report

21

mutual funds more heavily than non-mutual fund products or services because it is believed that they are more relevant. For example, other mutual funds are the products most like the Fund, they are readily available to Fund shareholders as alternative investment vehicles, and they are the type of investment vehicle in fact chosen and maintained by the Fund's investors. The range of their fees and expenses therefore appears to be a generally reliable indication of what consumers have found to be reasonable in the precise marketplace in which the Fund competes. The Fund's ability to deliver competitive performance when compared to its peer group was a useful indicator of how the Adviser is executing the Fund's investment program, which in turn assisted the Board in reaching a conclusion that the nature, extent, and quality of the Adviser's investment management services were such as to warrant continuation of the advisory contract. In this regard, the Senior Officer has reviewed Federated's fees for providing advisory services to products outside the Federated family of funds (e.g., institutional and separate accounts). He concluded that mutual funds and institutional accounts are inherently different products. Those differences include, but are not limited to, different types of targeted investors; being subject to different laws and regulations; different legal structures; different average account sizes; different associated costs; different portfolio management techniques made necessary by different cash flows; and portfolio manager time spent in review of securities pricing. The Senior Officer did not consider these fee schedules to be determinative in judging the appropriateness of mutual fund advisory contracts.

The Senior Officer reviewed reports compiled by Federated, using data supplied by independent fund ranking organizations, regarding the performance of, and fees charged by, other mutual funds, noting his view that comparisons to fund peer groups are relevant in judging the reasonableness of proposed fees.

For the periods covered by the report, the Fund's performance for the one- and five-year period was above the median of the relevant peer group, and the Fund's performance fell below the median of the relevant peer group for the three-year period. The Board discussed the Fund's performance with the Adviser and recognized the efforts being undertaken by the Adviser. The Board will continue to monitor these efforts and the performance of the Fund.

The Board also received financial information about Federated, including reports on the compensation and benefits Federated derived from its relationships with the Federated funds. These reports covered not only the fees under the advisory contracts, but also fees received by Federated's subsidiaries for providing other services to the Federated funds under separate contracts (e.g., for serving as the Federated funds' administrator). The reports also discussed any indirect benefit Federated may derive from its receipt of research services from brokers who execute Federated fund trades. In addition, the Board considered the fact that, in order for a fund to be competitive in the marketplace, Federated and its affiliates frequently waived fees and/or Semi-Annual Shareholder Report

22

reimbursed expenses and have disclosed to fund investors and/or indicated to the Board their intention to do so in the future, where appropriate. Moreover, the Board receives regular reports regarding the institution or elimination of these voluntary waivers.

Federated furnished reports, requested by the Senior Officer, that reported revenues on a fund-by-fund basis and made estimates of the allocation of expenses on a fund-by-fund basis, using allocation methodologies specified by the Senior Officer. The Senior Officer noted that, although they may apply consistent allocation processes, the inherent difficulties in allocating costs (and the unavoidable arbitrary aspects of that exercise) and the lack of consensus on how to allocate those costs may render such allocation reports unreliable. The allocation reports were considered in the analysis by the Board but were determined to be of limited use.

The Board and the Senior Officer also reviewed a report compiled by Federated comparing profitability information for Federated to other publicly held fund management companies. In this regard, the Senior Officer noted the limited availability of such information, but nonetheless concluded that Federated's profit margins did not appear to be excessive and the Board agreed.

The Senior Officer's evaluation also discussed the notion of possible realization of “economies of scale” as a fund grows larger. The Board considered in this regard that the Adviser has made significant and long-term investments in areas that support all of the Federated funds, such as personnel and processes for the portfolio management, compliance, and risk management functions; and systems technology; and that the benefits of these efforts (as well as any economies, should they exist) were likely to be enjoyed by the fund complex as a whole. Finally, the Board also noted the absence of any applicable regulatory or industry guidelines on this subject, which (as discussed in the Senior Officer's evaluation) is compounded by the lack of any common industry practice or general pattern with respect to structuring fund advisory fees with “breakpoints” that serve to reduce the fee as the fund attains a certain size. The Senior Officer did not recommend institution of breakpoints in pricing Federated's fund advisory services at this time.

It was noted in the materials for the Board meeting that for the period covered by the report, the Fund's investment advisory fee, after waivers and expense reimbursements, if any, was above the median of the relevant peer group. The Board reviewed the fees and other expenses of the Fund with the Adviser and was satisfied that the overall expense structure of the Fund remained competitive. The Board will continue to monitor advisory fees and other expenses borne by the Fund.

The Senior Officer's evaluation noted his belief that the information and observations contained in his evaluation supported a finding that the proposed management fees are reasonable, and that Federated appeared to provide appropriate administrative services to the Fund for the fees paid. Under these Semi-Annual Shareholder Report

23

circumstances, no changes were recommended to, and no objection was raised to, the continuation of the Fund's advisory contract. The Board concluded that the nature, quality and scope of services provided the Fund by the Adviser and its affiliates were satisfactory.

In its decision to continue an existing investment advisory contract, the Board was mindful of the potential disruptions of the Fund's operations and various risks, uncertainties and other effects that could occur as a result of a decision to terminate or not renew an advisory contract. In particular, the Board recognized that many shareholders have invested in the Fund on the strength of the Adviser's industry standing and reputation and with the expectation that the Adviser will have a continuing role in providing advisory services to the Fund. Thus, the Board's approval of the advisory contract reflected the fact that it is the shareholders who have effectively selected the Adviser by virtue of having invested in the Fund.

The Board based its decision to approve the advisory contract on the totality of the circumstances and relevant factors and with a view to past and future long-term considerations. Not all of the factors and considerations identified above were necessarily relevant to the Fund, nor did the Board consider any one of them to be determinative. With respect to the factors that were relevant, the Board's decision to approve the contract reflects its determination that Federated's performance and actions provided a satisfactory basis to support the decision to continue the existing arrangements.

Semi-Annual Shareholder Report

24

Voting Proxies on Fund Portfolio Securities

A description of the policies and procedures that the Fund uses to determine how to vote proxies, if any, relating to securities held in the Fund's portfolio is available, without charge and upon request, by calling 1-800-341-7400. A report on “Form N-PX” of how the Fund voted any such proxies during the most recent 12-month period ended June 30 is available from Federated's website at FederatedInvestors.com. To access this information from the “Products” section of the website, click on the “Prospectuses and Regulatory Reports” link under “Related Information,” then select the appropriate link opposite the name of the Fund; or select the name of the Fund and from the Fund's page, click on the “Prospectuses and Regulatory Reports” link. Form N-PX filings are also available at the SEC's website at www.sec.gov.

Quarterly Portfolio Schedule

The Fund files with the SEC a complete schedule of its portfolio holdings, as of the close of the first and third quarters of its fiscal year, on “Form N-Q.” These filings are available on the SEC's website at www.sec.gov and may be reviewed and copied at the SEC's Public Reference Room in Washington, DC. (Call 1-800-SEC-0330 for information on the operation of the Public Reference Room.) You may also access this information from the “Products” section of Federated's website at FederatedInvestors.com by clicking on “Portfolio Holdings” under “Related Information,” then selecting the appropriate link opposite the name of the Fund; or select the name of the Fund and from the Fund's page, click on the “Portfolio Holdings” link.

Semi-Annual Shareholder Report

25

Mutual funds are not bank deposits or obligations, are not guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency. Investment in mutual funds involves investment risk, including the possible loss of principal.

This Report is authorized for distribution to prospective investors only when preceded or accompanied by the Fund's Prospectus, which contains facts concerning its objective and policies, management fees, expenses and other information.

IMPORTANT NOTICE ABOUT FUND DOCUMENT DELIVERYIn an effort to reduce costs and avoid duplicate mailings, the Fund(s) intend to deliver a single copy of certain documents to each household in which more than one shareholder of the Fund(s) resides (so-called “householding”), as permitted by applicable rules. The Fund's “householding” program covers its/their Prospectus and Statement of Additional Information, and supplements to each, as well as Semi-Annual and Annual Shareholder Reports and any Proxies or information statements. Shareholders must give their written consent to participate in the “householding” program. The Fund is also permitted to treat a shareholder as having given consent (“implied consent”) if (i) shareholders with the same last name, or believed to be members of the same family, reside at the same street address or receive mail at the same post office box, (ii) the Fund gives notice of its intent to “household” at least sixty (60) days before it begins “householding” and (iii) none of the shareholders in the household have notified the Fund(s) or their agent of the desire to “opt out” of “householding.” Shareholders who have granted written consent, or have been deemed to have granted implied consent, can revoke that consent and opt out of “householding” at any time: shareholders who purchased shares through an intermediary should contact their representative; other shareholders may call the Fund at 1-800-341-7400.

Semi-Annual Shareholder Report

26

Federated GNMA Trust
Federated Investors Funds
4000 Ericsson Drive
Warrendale, PA 15086-7561

Contact us at FederatedInvestors.com
or call 1-800-341-7400.

Federated Securities Corp., Distributor

Cusip 314184102
Cusip 314184201

8083002 (9/10)

Federated is a registered mark of Federated Investors, Inc.
2010  © Federated Investors, Inc.

Item 2.                      Code of Ethics

Not Applicable

Item 3.                      Audit Committee Financial Expert

Not Applicable

Item 4.                      Principal Accountant Fees and Services

Not Applicable

Item 5.                      Audit Committee of Listed Registrants

Not Applicable

Item 6.                      Schedule of Investments

Not Applicable

Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies

Not Applicable

Item 8. Portfolio Managers of Closed-End Management Investment Companies

Not Applicable

Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers

Not Applicable

Item 10.                      Submission of Matters to a Vote of Security Holders

Not Applicable

Item 11.                                Controls and Procedures

(a) The registrant’s President and Treasurer have concluded that the

registrant’s disclosure controls and procedures (as defined in rule 30a-3(c) under the Act) are effective in design and operation and are sufficient to form the basis of the certifications required by Rule 30a-(2) under the Act, based on their evaluation of these disclosure controls and procedures within 90 days of the filing date of this report on Form N-CSR.

(b) There were no changes in the registrant’s internal control over financial reporting (as defined in rule 30a-3(d) under the Act) during the last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 12.                                Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Registrant	Federated GNMA Trust
By	/S/ Richard A. Novak
	Richard A. Novak, Principal Financial Officer
Date	September 21, 2010
Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
By	/S/ J. Christopher Donahue
	J. Christopher Donahue, Principal Executive Officer
Date	September 21, 2010
By	/S/ Richard A. Novak
	Richard A. Novak, Principal Financial Officer
Date	September 21, 2010

EX-99.CERT

N-CSR Item 12(a)(2) - Exhibits: Certifications

I, J. Christopher Donahue, certify that:

1.   I have reviewed this report on Form N-CSR of Federated GNMA Trust ("registrant");

2.   Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.   Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a.   designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.   designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.   evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d.   disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.   The registrant's other certifying officers and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.   all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b.   any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: September 21, 2010

/S/ J. Christopher Donahue

J. Christopher Donahue

President - Principal Executive Officer

N-CSR Item 12(a)(2) - Exhibits: Certifications

I, Richard A. Novak, certify that:

1.   I have reviewed this report on Form N-CSR of Federated GNMA Trust ("registrant");

2.   Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.   Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a.   designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.   designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.   evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d.   disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.   The registrant's other certifying officers and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.   all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b.   any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: September 21, 2010

/S/ Richard A. Novak

Richard A. Novak

Treasurer - Principal Financial Officer

EX-99.906CERT

N-CSR Item 12(b) - Exhibits: Certifications

SECTION 906 CERTIFICATION

Pursuant to 18 U.S.C.§ 1350, the undersigned officers of Federated GNMA Trust (the “Registrant”), hereby certify, to the best of our knowledge, that the Registrant’s Report on Form N-CSR for the period ended July 31, 2010 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities and Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Dated: September 21, 2010

/s/ J. Christopher Donahue

J. Christopher Donahue

Title: President, Principal Executive Officer

Dated: September 21, 2010

/s/ Richard A. Novak

Richard A. Novak

Title: Treasurer, Principal Financial Officer

This certification is being furnished solely pursuant to 18 U.S.C.§ 1350 and is not being filed as part of the Report or as a separate disclosure document.