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: (811-02608)

Exact name of registrant as specified in charter: Putnam Money Market Fund

Address of principal executive offices: One Post Office Square, Boston, Massachusetts 02109

Name and address of agent for service: Robert T. Burns, Vice President
One Post Office Square
Boston, Massachusetts 02109

Copy to:         John W. Gerstmayr, Esq.
Ropes & Gray LLP
800 Boylston Street
Boston, Massachusetts 02199-3600

Registrant’s telephone number, including area code: (617) 292-1000

Date of fiscal year end: September 30, 2013

Date of reporting period: December 31, 2012

Item 1. Schedule of Investments:

Putnam Money Market Fund
The fund's portfolio
12/31/12 (Unaudited)
REPURCHASE AGREEMENTS (41.2%)(a)
				Principal amount	Value
Interest in $412,000,000 joint tri-party repurchase agreement dated 12/31/12 with Citigroup Global Markets, Inc. due 1/2/13 - maturity value of $112,376,249 for an effective yield of 0.20% (collateralized by various mortgage backed securities with coupon rates ranging from 3.50% to 5.00% and due dates ranging from 9/20/40 to 9/1/42, valued at $420,240,001)				$112,375,000	$112,375,000
Interest in $73,100,000 joint tri-party repurchase agreement dated 12/31/12 with Credit Suisse First Boston due 1/2/13 - maturity value of $18,500,175 for an effective yield of 0.17% (collateralized by various corporate bonds and notes with coupon rates ranging from 1.35% to 7.30% and due dates ranging from 8/19/13 to 4/1/33, valued at $73,101,334)				18,500,000	18,500,000
Interest in $175,000,000 joint tri-party repurchase agreement dated 12/31/12 with Goldman Sach & Co. due 1/2/13 - maturity value of $112,376,561 for an effective yield of 0.25% (collateralized by a mortgage backed security with a coupon rate of 4.50% and a due date of 7/20/41, valued at $178,500,000)				112,375,000	112,375,000
Interest in $160,000,000 joint tri-party repurchase agreement dated 12/31/12 with JPMorgan Securities, Inc. due 1/2/13 - maturity value of $112,353,560 for an effective yield of 0.25% (collateralized by various mortgage backed securities with coupon rates ranging from 3.00% to 5.50% and due dates ranging from 12/1/25 to 12/1/42, valued at $160,001,279)				112,352,000	112,352,000
Interest in $68,000,000 joint tri-party repurchase agreement dated 12/31/12 with JPMorgan Securities, Inc. due 1/2/13 - maturity value of $22,500,213 for an effective yield of 0.17% (collateralized by various corporate bonds and notes with coupon rates ranging from 0.01% to 9.50% and due dates ranging from 8/15/13 to 7/15/42, valued at $68,006,044)				22,500,000	22,500,000
Interest in $466,474,000 joint tri-party repurchase agreement dated 12/31/12 with Royal Bank of Canada due 1/2/13 - maturity value of $112,376,186 for an effective yield of 0.19% (collateralized by various mortgage backed securities with coupon rates ranging from 4.00% to 5.50% and due dates ranging from 12/1/39 to 12/1/41, valued at $475,808,503)				112,375,000	112,375,000
Interest in $308,000,000 joint tri-party term repurchase agreement dated 12/26/12 with Citigroup Global Markets, Inc. due 1/2/13 - maturity value of $30,001,108 for an effective yield of 0.19% (collateralized by various mortgage backed securities with coupon rates ranging from 2.103% to 5.496% and due dates ranging from 10/1/20 to 1/1/43, valued at $314,279,839)				30,000,000	30,000,000
Interest in $30,000,000 joint tri-party term repurchase agreement dated 12/26/12 with Deutsche Bank Securities, Inc. due 1/2/13 - maturity value of $26,301,023 for an effective yield of 0.20% (collateralized by various mortgage backed securities with coupon rates of 3.00% and due dates ranging from 06/1/27 to 8/1/27, valued at $30,626,576)				26,300,000	26,300,000
Interest in $73,175,000 joint tri-party term repurchase agreement dated 12/21/12 with JPMorgan Securities, Inc. due 1/22/13 - maturity value of $18,804,846 for an effective yield of 0.29% (collateralized by various corporate bonds and notes with coupon rates ranging from zero % to 10.375% and due dates ranging from 2/15/13 to 12/16/50, valued at $73,178,815)				18,800,000	18,800,000
Interest in $257,000,000 joint tri-party term repurchase agreement dated 12/28/12 with JPMorgan Securities, Inc. due 1/4/13 - maturity value of $30,251,176 for an effective yield of 0.20% (collateralized by various mortgage backed securities with coupon rates ranging from 2.00% to 9.50% and due dates ranging from 1/10/20 to 1/1/43, valued at $257,003,506)				30,250,000	30,250,000
Interest in $30,000,000 tri-party term repurchase agreement dated 12/26/12 with Barclays Capital, Inc. due 1/2/13 - maturity value of $30,001,050 for an effective yield of 0.18% (collateralized by various mortgage backed securities with coupon rates ranging from 2.50% to 5.50% and due dates ranging from 1/1/25 to 9/1/42, valued at $30,600,001)				30,000,000	30,000,000
Total repurchase agreements (cost $625,827,000)					$625,827,000
ASSET-BACKED COMMERCIAL PAPER (14.4%)(a)
	Yield (%)	Maturity date		Principal amount	Value
Bryant Park Funding, LLC	0.240	1/23/13		$918,000	$917,865
Chariot Funding, LLC	0.210	3/11/13		10,800,000	10,795,653
Chariot Funding, LLC	0.210	3/4/13		4,200,000	4,198,481
CHARTA, LLC	0.250	1/15/13		7,700,000	7,699,251
CRC Funding, LLC	0.220	1/3/13		7,590,000	7,589,907
Fairway Finance, LLC (Canada)	0.200	1/16/13		7,500,000	7,499,375
Fairway Finance, LLC 144A (Canada)	0.000	4/9/13		6,300,000	6,300,000
Gotham Funding Corp. (Japan)	0.220	3/11/13		7,900,000	7,896,669
Gotham Funding Corp. (Japan)	0.220	2/15/13		15,000,000	14,995,875
Govco, LLC	0.220	1/9/13		7,500,000	7,499,633
Jupiter Securitization Co., LLC	0.210	3/4/13		10,600,000	10,596,166
Jupiter Securitization Co., LLC 144A (JPMorgan Chase & Co. (LOC))	0.210	3/6/13		4,500,000	4,498,320
Liberty Street Funding, LLC (Canada)	0.220	2/5/13		16,750,000	16,746,417
Manhattan Asset Funding Co., LLC (Japan)	0.230	3/15/13		5,750,000	5,747,318
Manhattan Asset Funding Co., LLC (Japan)	0.220	1/18/13		7,000,000	6,999,273
Old Line Funding, LLC	0.200	3/25/13		15,125,000	15,118,026
Straight-A Funding, LLC	0.190	3/7/13		21,000,000	20,992,796
Straight-A Funding, LLC	0.180	2/1/13		2,900,000	2,899,551
Straight-A Funding, LLC	0.180	1/9/13		5,500,000	5,499,780
Straight-A Funding, LLC 144A, Ser. 1	0.180	1/17/13		16,900,000	16,898,648
Thunder Bay Funding, LLC	0.210	3/25/13		7,600,000	7,596,320
Thunder Bay Funding, LLC	0.200	1/14/13		7,550,000	7,549,455
Variable Funding Capital Co., LLC 144A (Wachovia Bank NA (LOC))	0.170	1/25/13		2,850,000	2,849,677
Variable Funding Capital Co., LLC 144A (Wachovia Bank NA (LOC))	0.170	1/2/13		12,400,000	12,399,941
Working Capital Management Co. 144A (Japan)	0.200	1/4/13		7,600,000	7,599,873
Total asset-backed commercial paper (cost $219,384,270)					$219,384,270
COMMERCIAL PAPER (13.7%)(a)
	Yield (%)	Maturity date		Principal amount	Value
Australia & New Zealand Banking Group, Ltd. (Australia)	0.210	4/15/13		$12,000,000	$11,992,720
Australia & New Zealand Banking Group, Ltd. 144A (Australia)	0.761	1/10/13		10,400,000	10,400,000
COFCO Capital Corp. (Rabobank Nederland, NY Branch (LOC))	0.440	1/3/13		13,630,000	13,629,667
Commonwealth Bank of Australia 144A (Australia)	0.260	6/17/13		12,550,000	12,534,863
Commonwealth Bank of Australia 144A (Australia)	0.230	1/23/13		2,100,000	2,099,705
DnB Bank ASA (Norway)	0.351	1/28/13		9,600,000	9,597,480
DnB Bank ASA (Norway)	0.350	1/4/13		14,000,000	13,999,592
Export Development Canada (Canada)	0.200	4/23/13		6,700,000	6,695,831
Export Development Canada (Canada)	0.160	2/14/13		15,850,000	15,846,900
General Electric Capital Corp.	0.230	3/28/13		4,575,000	4,572,486
General Electric Capital Corp.	0.220	1/22/13		10,500,000	10,498,653
HSBC USA, Inc. (United Kingdom)	0.601	4/4/13		4,700,000	4,696,358
HSBC USA, Inc. (United Kingdom)	0.371	8/16/13		9,175,000	9,153,594
Nordea North America, Inc./DE (Sweden)	0.315	3/12/13		15,600,000	15,590,445
Nordea North America, Inc./DE (Sweden)	0.230	3/4/13		4,500,000	4,498,218
Standard Chartered Bank/New York	0.290	3/1/13		6,000,000	5,997,148
Standard Chartered Bank/New York 144A	0.290	4/9/13		9,250,000	9,242,698
State Street Corp.	0.210	3/15/13		6,900,000	6,897,062
State Street Corp.	0.210	3/11/13		8,190,000	8,186,704
Sumitomo Mitsui Banking Corp. (Japan)	0.260	4/9/13		2,250,000	2,248,408
Toronto-Dominion Holdings (USA), Inc. 144A (Canada)	0.290	2/4/13		1,800,000	1,799,507
Toyota Credit Canada, Inc. (Canada)	0.230	1/14/13		6,900,000	6,899,427
Toyota Credit Canada, Inc. (Canada)	0.220	1/28/13		8,175,000	8,173,651
Westpac Banking Corp. 144A (Australia)	0.591	8/12/13		12,400,000	12,377,341
Total commercial paper (cost $207,628,458)					$207,628,458
U.S. TREASURY OBLIGATIONS (10.5%)(a)
	Yield (%)	Maturity date		Principal amount	Value
U.S. Treasury Bills	0.176	10/17/13		$13,000,000	$12,981,215
U.S. Treasury Bills	0.147	5/2/13		15,000,000	14,992,286
U.S. Treasury Bills	0.139	4/4/13		35,000,000	34,987,342
U.S. Treasury Bills	0.119	7/25/13		15,650,000	15,639,306
U.S. Treasury Notes(k)	3.500	5/31/13		16,000,000	16,218,192
U.S. Treasury Notes(k)	0.625	4/30/13		34,250,000	34,301,866
U.S. Treasury Notes(k)	0.375	7/31/13		30,000,000	30,031,566
Total U.S. treasury obligations (cost $159,151,773)					$159,151,773
CORPORATE BONDS AND NOTES (6.3%)(a)
	Interest rate (%)	Maturity date		Principal amount	Value
Commonwealth Bank of Australia 144A sr. unsec. notes FRN (Australia)	0.859	3/19/13		$7,850,000	$7,857,707
HSBC Bank PLC 144A sr. unsec. unsub. notes FRN (United Kingdom)	0.725	1/18/13		8,650,000	8,651,044
JPMorgan Chase & Co. sr. unsec. unsub. notes FRN, MTN	0.962	2/26/13		7,000,000	7,007,065
National Australia Bank, Ltd. 144A sr. unsec. notes FRN (Australia)	0.831	1/8/13		1,109,000	1,109,073
Royal Bank of Canada 144A sr. unsec. notes FRN (Canada)(M)	0.689	5/15/14		29,425,000	29,425,789
Svenska Handelsbanken/New York, NY 144A unsec. notes FRN (Sweden)	0.293	1/7/13		23,500,000	23,500,000
Wachovia Corp. sr. unsec. notes MTN, Ser. G	5.700	8/1/13		3,803,000	3,921,161
Wachovia Corp. sr. unsec. notes MTN, Ser. G	5.500	5/1/13		3,700,000	3,763,323
Westpac Banking Corp. 144A sr. unsec. notes FRN (Australia)	0.730	6/14/13		10,000,000	10,015,257
Total corporate bonds and notes (cost $95,250,419)					$95,250,419
MUNICIPAL BONDS AND NOTES (5.7%)(a)
	Yield (%)	Maturity date	Rating(RAT)	Principal amount	Value
California (0.5%)
California Educational Facilities Authority Commercial Paper (Stanford University), Ser. STAN	0.180	1/18/13	P-1	$8,250,000	$8,250,000
					8,250,000
Colorado (0.3%)
Catholic Health Initiatives Commercial Paper, Ser. A	0.240	2/15/13	P-1	4,000,000	3,998,800
					3,998,800
District of Columbia (0.5%)
American University Commercial Paper, Ser. A	0.180	3/13/13	A-1	7,600,000	7,597,302
					7,597,302
Indiana (1.1%)
Indiana Finance Authority Commercial Paper, Ser. D-2	0.170	1/8/13	VMIG1	8,250,000	8,250,000
Saint Joseph County Commercial Paper (University of Notre Dame Du Lac)	0.190	1/11/13	P-1	8,250,000	8,249,565
					16,499,565
Kentucky (0.7%)
Kentucky Economic Development Finance Authority VRDN (Catholic Health Initiatives), Ser. C(M)	0.130	5/1/34	VMIG1	11,000,000	11,000,000
					11,000,000
Maryland (0.5%)
Johns Hopkins University Commercial Paper	0.220	1/8/13	P-1	5,000,000	5,000,000
Johns Hopkins University Commercial Paper	0.200	1/7/13	P-1	2,000,000	2,000,000
					7,000,000
North Carolina (1.6%)
Duke University Commercial Paper, Ser. B-98	0.190	3/7/13	P-1	3,500,000	3,498,799
Duke University Commercial Paper, Ser. B-98	0.180	1/14/13	P-1	18,860,000	18,858,774
Wake County, VRDN, Ser. B(M)	0.140	3/1/24	VMIG1	1,500,000	1,500,000
					23,857,573
Texas (0.2%)
Harris County, Health Facilities Development Authority VRDN (Texas Childrens Hospital), Ser. B-1(M)	0.150	10/1/29	VMIG1	3,665,000	3,665,000
					3,665,000
Wisconsin (0.3%)
Wisconsin State Health & Educational Facilities Authority VRDN (Wheaton Franciscan Services), Ser. B (U.S. Bank NA (LOC))(M)	0.120	8/15/33	VMIG1	4,100,000	4,100,000
					4,100,000
Total municipal bonds and notes (cost $85,968,240)					$85,968,240
CERTIFICATES OF DEPOSIT (4.8%)(a)
	Interest rate (%)	Maturity date		Principal amount	Value
Bank of Montreal/Chicago, IL FRN (Canada)	0.431	6/21/13		$9,250,000	$9,250,000
Bank of Nova Scotia/Houston FRN	0.658	9/17/13		5,500,000	5,512,540
Canadian Imperial Bank of Commerce/New York, NY FRN (Canada)	0.334	4/26/13		15,000,000	15,000,000
National Australia Bank, Ltd. (Australia)	0.258	5/20/13		14,200,000	14,200,000
National Australia Bank, Ltd./New York FRN (Australia)	0.396	4/24/13		8,350,000	8,350,000
Toronto-Dominion Bank/NY (Canada)	0.300	1/18/13		8,300,000	8,300,430
Toronto-Dominion Bank/NY FRN (Canada)	0.321	10/21/13		12,500,000	12,500,000
Total certificates of deposit (cost $73,112,970)					$73,112,970
U.S. GOVERNMENT AGENCY OBLIGATIONS (3.6%)(a)
	Interest rate (%)	Maturity date		Principal amount	Value
Federal Farm Credit Bank unsec. notes FRN, Ser. 1	0.250	1/14/13		$24,300,000	$24,300,000
Federal Home Loan Bank sr. unsec. notes	0.170	9/20/13		14,900,000	14,899,466
Federal Home Loan Bank unsec. notes	0.400	7/9/13		7,000,000	7,009,035
Federal National Mortgage Association unsec. notes	0.500	8/9/13		9,000,000	9,018,605
Total U.S. government agency obligations (cost $55,227,106)					$55,227,106
TOTAL INVESTMENTS
Total investments (cost $1,521,550,236)(b)					$1,521,550,236

Key to holding's abbreviations
FRN	Floating Rate Notes: the rate shown is the current interest rate at the close of the reporting period
LOC	Letter of Credit
MTN	Medium Term Notes
VRDN	Variable Rate Demand Notes, which are floating-rate securities with long-term maturities, that carry coupons that reset every one or seven days. The rate shown is the current interest rate at the close of the reporting period.

	Notes to the fund's portfolio
	Unless noted otherwise, the notes to the fund's portfolio are for the close of the fund's reporting period, which ran from October 1, 2012 through December 31, 2012 (the reporting period). Within the following notes to the portfolio, references to “ASC 820” represent Accounting Standards Codification ASC 820 Fair Value Measurements and Disclosures and references to “Putnam Management” represent Putnam Investment Management, LLC, the fund's manager, an indirect wholly-owned subsidiary of Putnam Investments, LLC.
(a)	Percentages indicated are based on net assets of $1,520,388,396.
(RAT)	The Moody's, Standard & Poor's or Fitch ratings indicated are believed to be the most recent ratings available at the close of the reporting period for the securities listed. Ratings are generally ascribed to securities at the time of issuance. While the agencies may from time to time revise such ratings, they undertake no obligation to do so, and the ratings do not necessarily represent what the agencies would ascribe to these securities at the close of the reporting period. The rating of an insured security represents what is believed to be the most recent rating of the insurer's claims-paying ability available at the close of the reporting period, if higher than the rating of the direct issuer of the bond, and does not reflect any subsequent changes. Security ratings are defined in the Statement of Additional Information.
(b)	The aggregate identified cost on a financial reporting and tax basis is the same.
	Affiliated company. Transactions during the period with Putnam Money Market Liquidity Fund, which is under common ownership and control, were as follows:
	Name of affiliate	Market value at the beginning of the reporting period	Purchase cost	Sale proceeds	Investment income	Market value at the end of the reporting period
	Putnam Money Market Liquidity Fund *	$171	$—	$171	$— **	$—
	* Management fees charged to Putnam Money Market Liquidity Fund have been waived by Putnam Management.
	** Amount represents less than one rounded dollar.
(k)	The rates shown are the current interest rates at the close of the reporting period.
(M)	The security's effective maturity date is less than one year.
	Debt obligations are considered secured unless otherwise indicated.
	144A after the name of an issuer represents securities exempt from registration under Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration, normally to qualified institutional buyers.
	The dates shown on debt obligations are the original maturity dates.
	DIVERSIFICATION BY COUNTRY
	Distribution of investments by country of risk at the close of the reporting period, excluding collateral received, if any (as a percentage of Portfolio Value):
	United States	75.5%
	Canada	9.5
	Australia	6.0
	Japan	3.0
	Sweden	2.9
	Norway	1.6
	United Kingdom	1.5
	Total	100.0%
	Security valuation: The valuation of the fund’s portfolio instruments is determined by means of the amortized cost method (which approximates market value) as set forth in Rule 2a-7 under the Investment Company Act of 1940. The amortized cost of an instrument is determined by valuing it at its original cost and thereafter amortizing any discount or premium from its face value at a constant rate until maturity and is generally categorized as a Level 2 security.
	Investments in open-end investment companies (excluding exchange traded funds), if any, which can be classified as Level 1 or Level 2 securities, are based on their net asset value. The net asset value of such investment companies equals the total value of their assets less their liabilities and divided by the number of their outstanding shares.
	Repurchase agreements: The fund, or any joint trading account, through its custodian, receives delivery of the underlying securities, the market value of which at the time of purchase is required to be in an amount at least equal to the resale price, including accrued interest. Collateral for certain tri-party repurchase agreements is held at the counterparty’s custodian in a segregated account for the benefit of the fund and the counterparty. Putnam Management is responsible for determining that the value of these underlying securities is at all times at least equal to the resale price, including accrued interest. In the event of default or bankruptcy by the other party to the agreement, retention of the collateral may be subject to legal proceedings.

ASC 820 establishes a three-level hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of the fund’s investments. The three levels are defined as follows:
Level 1: Valuations based on quoted prices for identical securities in active markets.
Level 2: Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.
Level 3: Valuations based on inputs that are unobservable and significant to the fair value measurement.
The following is a summary of the inputs used to value the fund’s net assets as of the close of the reporting period:
		Valuation inputs
Investments in securities:	Level 1	Level 2	Level 3
Asset-backed commercial paper	$—	$219,384,270	$—
Certificates of deposit	—	73,112,970	—
Commercial paper	—	207,628,458	—
Corporate bonds and notes	—	95,250,419	—
Municipal bonds and notes	—	85,968,240	—
Repurchase agreements	—	625,827,000	—
U.S. government agency obligations	—	55,227,106	—
U.S. treasury obligations	—	159,151,773	—
Totals by level	$—	$1,521,550,236	$—
For additional information regarding the fund please see the fund's most recent annual or semiannual shareholder report filed on the Securities and Exchange Commission's Web site, www.sec.gov, or visit Putnam's Individual Investor Web site at www.putnaminvestments.com

Item 2. Controls and Procedures:

(a) The registrant’s principal executive officer and principal financial officer have concluded, based on their evaluation of the effectiveness of the design and operation of the registrant’s disclosure controls and procedures as of a date within 90 days of the filing date of this report, that the design and operation of such procedures are generally effective to provide reasonable assurance that information required to be disclosed by the registrant in this report is recorded, processed, summarized and reported within the time periods specified in the Commission’s rules and forms.

(b) Changes in internal control over financial reporting: Not applicable

Item 3. Exhibits:

Separate certifications for the principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Investment Company Act of 1940, as amended, are filed herewith.

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.

Putnam Money Market Fund

By (Signature and Title):

/s/ Janet C. Smith
Janet C. Smith
Principal Accounting Officer
Date: February 28, 2013

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 (Signature and Title):

/s/ Jonathan S. Horwitz
Jonathan S. Horwitz
Principal Executive Officer
Date: February 28, 2013

By (Signature and Title):

/s/ Steven D. Krichmar
Steven D. Krichmar
Principal Financial Officer
Date: February 28, 2013