Putnam Investments 

One Post Office Square 

Boston, MA 02109 

February 1, 2011 

Securities and Exchange Commission
100 F Street, NE
Washington, DC 20549

RE:	Putnam Money Market Fund (Reg. No. 2-55091) (811-02608)
	Putnam Tax Exempt Money Market Fund (Reg. No. 33-15238) (811-05215) (the “Funds”)
	Post-Effective Amendment No. 44 and 28 to Registration Statement on Form N-1A

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, each Fund hereby certifies that the form of Prospectus and Statement of Additional Information that would have been filed on behalf of the Fund pursuant to Rule 497(c) upon the effectiveness of Post-Effective Amendments No. 44 and 28 to the Registration Statements on Form N-1A (the “Amendment”) of Putnam Money Market Fund and Putnam Tax Exempt Money Market Fund, respectively, would not have differed from that contained in the Amendment, which is the most recent amendment to such Registration Statement and was filed electronically on January 28, 2011.

Comments or questions concerning this certificate may be directed to Anne Marie Duffy at 1-800-225-2465, ext. 14824.

	Very truly yours,
	PUTNAM MONEY MARKET FUND
	PUTNAM TAX EXEMPT MONEY MARKET
	FUND
By:	/s/ Jonathan S. Horwitz
	Jonathan S. Horwitz
	Executive Vice President, Treasurer, Principal
	Executive Officer and Compliance Liaison

cc: Emma Eriksson Broomhead, Esq. 

      Ropes & Gray LLP