N-Q

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 811-4430 

Dreyfus 100% U.S. Treasury Money Market 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:	3/31/2008

FORM N-Q

Item 1. Schedule of Investments.

STATEMENT OF INVESTMENTS
Dreyfus 100% U.S. Treasury Money Market Fund
March 31, 2008 (Unaudited)
	Annualized
	Yield on Date	Principal
U.S. Treasury Bills--100.2%	of Purchase (%)	Amount ($)	Value ($)
4/3/08	3.33	76,809,000	76,794,949
4/10/08	3.12	43,300,000	43,266,537
4/15/08	1.92	70,900,000	70,847,353
4/17/08	1.82	107,000,000	106,913,944
4/24/08	1.25	13,000,000	12,989,618
5/1/08	0.31	14,000,000	13,996,383
5/8/08	1.50	4,000,000	3,993,833
5/15/08	3.44	115,300,000	114,824,177
5/22/08	2.49	88,300,000	87,993,533
5/29/08	1.66	14,200,000	14,162,260
6/12/08	3.19	88,000,000	87,447,360
6/19/08	2.37	2,300,000	2,288,139
7/3/08	3.22	5,300,000	5,256,597
7/10/08	3.11	5,200,000	5,155,800
7/24/08	2.39	27,000,000	26,798,220
8/14/08	2.03	21,000,000	20,841,712
8/21/08	2.04	11,600,000	11,507,803
9/4/08	1.48	131,752,000	130,912,252
Total Investments (cost $835,990,470)		100.2%	835,990,470
Liabilities, Less Cash and Receivables		(.2%)	(1,841,905)
Net Assets		100.0%	834,148,565
For Federal tax purposes, the fund's approximate tax cost is equal to book cost.

Securities valuation policies and other 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.

Various inputs are used in determining the value of the fund's investments relating to Financial Accounting Standard No. 157 (FAS 157), 

Fair Value Measurements. 

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 fund's own assumption 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. For example, money market securities are valued using amortized cost, in accordance with rules under the Investment 

Company Act of 1940. Generally, amortized cost approximates the current fair value of a security, but since the value is not obtained 

from a quoted price in an active market, such securities are reflected as Level 2. 

The following is a summary of the inputs used as of March 31, 2008 in valuing the fund's assets carried 

at fair value: 

Valuation Inputs	Investments in Securities ($)	Other Financial Instruments* ($)
Level 1 - Quoted Prices	0		0
Level 2 - Other Significant Observable Inputs	835,990,470		0
Level 3 - Significant Unobservable Inputs	0		0
Total	835,990,470		0
* Other financial instruments include futures, forwards and swap contracts.

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 100% U.S. Treasury Money Market Fund

By:	/s/ J. David Officer
	J. David Officer
	President
Date:	May 22, 2008
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:	May 22, 2008
By:	/s/ James Windels
	James Windels
	Treasurer
Date:	May 22, 2008

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)

EX-99

SECTION 302 CERTIFICATION

I, J. David Officer, certify that:

1. I have reviewed this report on Form N-Q of Dreyfus 100% U.S. Treasury Money Market Fund;

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 schedule of investments included in this report fairly present in all material respects the investments of the registrant as of the end of the fiscal quarter for which the report is filed;

4. The registrant's other certifying officer(s) 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 registrant's most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting;

5. The registrant's other certifying officer(s) 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.

By:	/s/ J. David Officer
	J. David Officer
	President
Date:	May 22, 2008

SECTION 302 CERTIFICATION

I, James Windels, certify that:

1. I have reviewed this report on Form N-Q of Dreyfus 100% U.S. Treasury Money Market Fund;

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 schedule of investments included in this report fairly present in all material respects the investments of the registrant as of the end of the fiscal quarter for which the report is filed;

4. The registrant's other certifying officer(s) 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 registrant's most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting;

5. The registrant's other certifying officer(s) 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.

By:	/s/ James Windels
	James Windels
	Treasurer
Date:	May 22, 2008