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82 Devonshire Street
Boston MA 02109-3614
617-563-7000

||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| March 10, 2010

U.S. Securities & Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attn: Christian Sandoe

RE:	Fidelity Colchester Street Trust (the trust):
	Government Portfolio Money Market Portfolio Prime Money Market Portfolio Tax-Exempt Portfolio Treasury Portfolio Treasury Only Portfolio (the funds)
	File Nos. (002-74808) and (811-03320)
	Post-Effective Amendment No. 59

Ladies and Gentlemen:

Pursuant to Rule 8b-16 under the Investment Company Act of 1940, as amended, Regulation S-T and Rule 485(a) under the Securities Act of 1933, as amended, transmitted herewith on behalf of the trust is Post-Effective Amendment No. 59 to the trust's current effective Registration Statement on Form N-1A. This transmission contains a conformed signature page, the manually signed original of which, executed pursuant to Powers of Attorney dated February 1, 2009 and March 1, 2010, is maintained at the offices of the trust.

This filing contains the Prospectuses and Statement of Additional Information for Government Portfolio, Money Market Portfolio, Prime Money Market Portfolio, Tax-Exempt Portfolio, Treasury Portfolio, and Treasury Only Portfolio. The documents have been modified to reflect amendments made to Form N-1A under the Enhanced Disclosure and New Prospectus Delivery Option for Registered Open-End Management Investment Companies Final Rule. This is the first filing of these documents in the amended format.] Due to the extent of the modifications made to the prospectuses, these documents have not been tagged to indicate changes made since the last definitive filing. Each fund's SAI has been tagged to indicate modifications made since the last definitive filing. The funds may be marketed through banks, savings and loan associations, or credit unions.

This filing also serves to update standard disclosure and implement editorial changes.

Pursuant to Rule 485(a), the trust elects an effective date of May 29, 2010. We request your comments by April 9, 2010.

Please contact Jamie Plourde at (617) 563-1375 in connection with any questions or comments regarding this filing.

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||	Sincerely,
	/s/ Catherine Conlin
	Catherine Conlin
	Legal Product Group