UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT 

INVESTMENT COMPANY

Investment Company Act file number 811-4429

Dreyfus U.S. Treasury Long Term Fund
(Exact name of Registrant as specified in charter)

c/o The Dreyfus Corporation
200 Park Avenue
New York, New York 10166
(Address of principal executive offices) (Zip code)

Michael A. Rosenberg, Esq.
200 Park Avenue
New York, New York 10166
(Name and address of agent for service)

Registrant's telephone number, including area code:		(212) 922-6000
Date of fiscal year end:	12/31
Date of reporting period:	9/30/09

FORM N-Q

Item 1.  Schedule of Investments. 

STATEMENT OF INVESTMENTS 

Dreyfus U.S. Treasury Long Term Fund 

September 30, 2009 (Unaudited) 

	Coupon	Maturity	Principal
Bonds and Notes--97.1%	Rate (%)	Date	Amount ($)	Value ($)
U.S. Government Agencies--4.6%
Residual Funding - Strip,
Bonds	0.00	4/15/30	8,720,000 a	3,423,960
U.S. Treasury Bonds--92.5%
4.25%, 5/15/39			2,550,000 b	2,638,852
4.50%, 2/15/36			8,525,000 b	9,159,056
4.75%, 2/15/37			10,925,000	12,193,327
5.25%, 2/15/29			9,535,000 b,c	11,071,031
6.13%, 11/15/27			9,020,000 b	11,458,223
6.25%, 8/15/23			6,060,000 b	7,597,731
6.38%, 8/15/27			640,000	832,000
7.63%, 11/15/22			6,015,000 b	8,370,252
8.00%, 11/15/21			2,920,000 b	4,134,083
8.75%, 8/15/20			950,000 b	1,392,789
				68,847,344
Total Bonds and Notes
(cost $71,538,529)				72,271,304
			Principal
Short-Term Investments--2.6%			Amount ($)	Value ($)
U.S. Treasury Bills
0.16%, 11/12/09			1,485,000	1,484,930
0.07%, 10/15/09			494,000 c	493,997
Total Short-Term Investments
(cost $1,978,710)				1,978,927
Other Investment--.2%			Shares	Value ($)
Registered Investment Company;
Dreyfus Institutional Preferred
Plus Money Market Fund
(cost $146,000)			146,000 d	146,000

Investment of Cash Collateral for
Securities Loaned--44.3%
Registered Investment Company;
Dreyfus Institutional Cash
Advantage Fund
(cost $32,967,364)	32,967,364 d	32,967,364
Total Investments (cost $106,630,603)	144.2%	107,363,595
Liabilities, Less Cash and Receivables	(44.2%)	(32,905,677)
Net Assets	100.0%	74,457,918

a	Security issued with a zero coupon. Income is recognized through the accretion of discount.
b	All or a portion of these securities are on loan. At September 30, 2009, the total market value of the fund's securities on loan is $31,791,669 and the total market value of the collateral held by the fund is $32,967,364.
c	All or partially held by a broker as collateral for open financial futures positions.
d	Investment in affiliated money market mutual fund.

At September 30, 2009, the aggregate cost of investment securities for income tax purposes was $106,630,603.

Net unrealized appreciation on investments was $732,792 of which $2,588,202 related to appreciated investment securities and $1,855,410 related to depreciated investment securities.

STATEMENT OF FINANCIAL FUTURES
September 30, 2009 (Unaudited)
		Market Value		Unrealized
		Covered by		(Depreciation)
	Contracts	Contracts ($)	Expiration	at 9/30/2009 ($)
Financial Futures Short
U.S. Treasury 30 Year Bonds	23	(2,791,625)	December 2009	(54,656)
STATEMENT OF OPTIONS WRITTEN
September 30, 2009 (Unaudited)

	Face Amount
	Covered by
	Contracts ($)		Value ($)
Call Options
5-Year USD LIBOR-BBA,
October 2009 @ 2.85	748,000	a	(8,002)
10-Year USD LIBOR-BBA,
September 2012 @ 4.50	2,180,000	a	(159,291)
Put Options
5-Year USD LIBOR-BBA,
October 2009 @ 2.85	748,000	a	(2,227)
10-Year USD LIBOR-BBA,
September 2012 @ 4.50	2,180,000	a	(133,939)
(Premiums received $303,259)			(303,459)
BBA--British Bankers Association
LIBOR--London Interbank Offered Rate
USD--US Dollar
a Non-income producing security.

Various inputs are used in determining the value of the fund's investments relating to Fair Value Measurements.

These inputs are summarized in the three broad levels listed below.

Level 1 - quoted prices in active markets for identical investments.
Level 2 - other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds,
credit risk, etc.)
Level 3 - significant unobservable inputs (including fund's own assumptions in determining the fair value of investments).

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

The following is a summary of the inputs used as of September 30, 2009 in valuing the fund's investments:

			Level 3 -
		Level 2 - Other	Significant
	Level 1 -	Significant Observable	Unobservable
Assets ($)	Quoted Prices	Inputs	Inputs	Total
Investments in Securities:
U.S. Treasury Securities	-	70,826,271	-	70,826,271
U.S. Government Agencies	-	3,423,960	-	3,423,960
Mutual Funds	33,113,364	-	-	33,113,364
Other Financial Instruments+	-	-	-	-
Liabilities ($)
Other Financial Instruments+	(54,656)	(303,459)	-	(358,115)

+ Other financial instruments include derivative instruments, such as futures, forward foreign currency 

exchange contracts, swap contracts and options contracts. Amounts shown represent unrealized appreciation (depreciation), 

or in the case of options, market value at period end. 

The Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) has become the exclusive reference of authoritative U.S. generally accepted accounting principles (“GAAP”) recognized by the FASB to be applied by nongovernmental entities. Rules and interpretive releases of the Securities and Exchange Commission (“SEC”) under authority of federal laws are also sources of authoritative GAAP for SEC registrants. The Codification has superseded all existing non-SEC accounting and reporting standards. The fund’s financial statements are prepared in accordance with GAAP, which may require the use of management estimates and assumptions. Actual results could differ from those estimates.

The fund adopted the provisions of ASC 815 Derivatives and Hedging which requires qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts of gains and losses on derivative instruments and disclosures about credit-risk-related contingent features in derivative agreements. The disclosure requirements distinguish between derivatives, which are accounted for as “hedges” and those that do not qualify for hedge accounting. Because investment companies value their derivatives at fair value and recognize changes in fair value through the Statement of Operations, they do not qualify for such accounting. Accordingly, even though a fund’s investments in derivatives may represent economic hedges, they are considered to be non-hedge transactions for purposes of this disclosure.

Portfolio valuation: Investments in securities excluding short-term investments (other than U.S. Treasury Bills), financial futures and options transactions are valued each business day by an independent pricing service (the “Service”) approved by the Board of Trustees. Investments for which quoted bid prices are readily available and are representative of the bid side of the market in the judgment of the Service are valued at the mean between the quoted bid prices (as obtained by the Service from dealers in such securities) and asked prices (as calculated by the Service based upon its evaluation of the market for such securities). Other investments (which constitute a majority of the portfolio securities) are valued as determined by the Service, based on methods which include consideration of: yields or prices of securities of comparable quality, coupon, maturity and type, indications as to val-

ues from dealers, and general market conditions. Restricted securities, as well as securities or other assets for which recent market quotations are not readily available, that are not valued by a pricing service approved by the Board of Trustees, or are determined by the fund not to reflect accurately fair value, are valued at fair value as determined in good faith under the direction of the Board of Trustees. The factors that may be considered when fair valuing a security include fundamental analytical data, the nature and duration of restrictions on disposition, an evaluation of the forces that influence the market in which the securities are purchased and sold and public trading in similar securities of the issuer or comparable issuers. Short-term investments, excluding U.S. Treasury Bills, are carried at amortized cost, which approximates value. Registered investment companies that are not traded on an exchange are valued at their net asset value. Financial futures and options, which are traded on an exchange, are valued at the last sales price on the securities exchange on which such securities are primarily traded or at the last sales price on the national securities market on each business day. Options traded over-the-counter are priced at the mean between the bid and asked price.

Pursuant to a securities lending agreement with The Bank of New York Mellon, a subsidiary of BNY Mellon and an affiliate of Dreyfus, the fund may lend securities to qualified institutions. It is the fund’s policy that, at origination, all loans are secured by collateral of at least 102% of the value of U.S. securities loaned and 105% of the value of foreign securities loaned. Collateral equivalent to at least 100% of the market value of securities on loan will be maintained at all times. Collateral is either in the form of cash, which can be invested in certain money market mutual funds managed by the Manager, U.S. Government and Agency securities or letters of credit. The fund is entitled to receive all income on securities loaned, in addition to income earned as a result of the lending transaction. Although each security loaned is fully collateralized, the fund bears the risk of delay in recovery of, or loss of rights in, the securities loaned should a borrower fail to return the securities in a timely manner.

Futures Contracts: In the normal course of pursuing its investment objectives, the fund is exposed to market risk, including equity price risk as a result of changes in value of underlying financial instruments. The fund may invest in financial futures contracts in order to manage its exposure to or protect against changes in the market. A futures contract represents a commitment for the future purchase or a sale of an asset at a specified date. Upon entering into such contracts, these investments require initial margin deposits with a broker, which consist of cash or cash equivalents. The amount of these deposits is determined by the exchange or Board of Trade on which the contract is traded and is subject to change. Accordingly, variation margin payments are received or made to reflect daily unrealized gains or losses which are recorded in the Statement of Operations. Futures contracts are valued daily at the settlement price established by the Board of Trade or exchange upon which they are traded. When the contracts are closed, the fund recognizes a realized gain or loss. There is minimal counterparty credit risk to the fund with futures, since futures are exchange traded and the exchange’s clearinghouse, as counterparty to all exchange traded futures, guarantees the futures against default. Contracts open at September 30, 2009 are set forth in the Statement of Financial Futures.

Options: A call option gives the purchaser of the option the right (but not the obligation) to buy, and obligates the writer to sell, the underlying security or securities at the exercise price at any time during the option period, or at a specified date. Conversely, a put option gives the purchaser of the option the right (but not the obligation) to sell, and obligates the writer to buy the underlying security or securities at the exercise price at any time during the option period, or at a specified date. The fund may purchase and write (sell) put and call options primarily to hedge against changes in security prices, or securities that the fund intends to purchase, or against fluctuations in value caused by changes in prevailing market interest rates or other market conditions.

As a writer of call options, the fund receives a premium at the outset and then bears the market risk of unfavorable changes in the price of the financial instrument underlying the option. Generally, the fund would incur a gain, to the extent of the premium, if the price of the underlying financial instrument decreases between the date the option is written and the date on which the option is terminated. Generally, the fund would realize a loss, if the price of the financial instrument

increases between those dates.

As a writer of put options, the fund receives a premium at the outset and then bears the market risk of unfavorable changes in the price of the financial instrument underlying the option. Generally, the fund would incur a gain, to the extent of the premium, if the price of the underlying financial instrument increases between the date the option is written and the date on which the option is terminated. Generally, the fund would realize a loss, if the price of the financial instrument decreases between those dates. As a writer of an option, the fund may have no control over whether the underlying securities may be sold (call) or purchased (put) and as a result bear the market risk of an unfavorable change in the price of the security underlying the written option. One risk of holding a put or a call option is that if the option is not sold or exercised prior to its expiration, it becomes worthless. However, this risk is limited to the premium paid by the fund. Upon the expiration or closing of the option transaction, a gain or loss is reported in the Statement of Operations.

Additional investment related disclosures are hereby incorporated by reference to the annual and semi-annual reports previously filed with the Securities and Exchange Commission on Form N-CSR.

Item 2.  Controls and Procedures. 

(a) The Registrant's principal executive and principal financial officers have concluded, based on their evaluation of the Registrant's disclosure controls and procedures as of a date within 90 days of the filing date of this report, that the Registrant's disclosure controls and procedures are reasonably designed to ensure that information required to be disclosed by the Registrant on Form N-Q is recorded, processed, summarized and reported within the required time periods and that information required to be disclosed by the Registrant in the reports that it files or submits on Form N-Q is accumulated and communicated to the Registrant's management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.

(b) There were no changes to the Registrant's internal control over financial reporting that occurred during the Registrant's most recently ended fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting.

Item 3.  Exhibits. 

(a) Certifications of principal executive and principal financial officers as required by Rule 30a-2(a) under the Investment Company Act of 1940.

FORM N-Q

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.

Dreyfus U.S. Treasury Long Term Fund

By:	/s/ J. David Officer
	J. David Officer
	President
Date:	November 19, 2009

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. David Officer
	J. David Officer
	President
Date:	November 19, 2009

By:	/s/ James Windels
	James Windels
Treasurer
Date:	November 19, 2009

EXHIBIT INDEX

(a) Certifications of principal executive and principal financial officers as required by Rule 30a-2(a) under the Investment Company Act of 1940. (EX-99.CERT)