Putnam Investments 

One Post Office Square 

Boston, MA 02109 

November 13, 2009 

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. 42 to Registration Statement on Form N-1A

Ladies and Gentlemen:

We are filing the referenced Amendment pursuant to Rule 485(a) under the Securities Act of 1933 and Rule 8b-16 under the Investment Company Act of 1940 for review and comment by the Staff of the Commission. The Amendment is marked to show changes from the Prospectus and Statement of Additional Information dated January 30, 2009, filed with the Commission on January 28, 2009. The Amendment is expected to become effective on January 30, 2010.

The Summary Section of the prospectus has been revised to comply with the amendments to form N-1A that took effect on March 31, 2009. The prospectus and statement of additional information also reflect other changes that Putnam plans to incorporate in the prospectuses and SAIs of Putnam funds as they are updated.

Any comments or questions on this filing may be directed to AnneMarie Duffy at 1-800-225-2465, Ext. 14824, or to the undersigned at 1-800-225-2465, Ext. 17055.

Very truly yours, 

Cynthia Danger 

Legal Product Specialist 

cc: James Thomas, Esq.
      Ropes & Gray LLP