FIDELITY (LOGO) INVESTMENTS(registered trademark) FMR Corp.
82 Devonshire Street
Boston MA 02109-3614
617 563 7000
October 24, 1997
Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C. 20549
Attention: File Room
Re: Fidelity Money Market Trust (the trust):
Retirement Money Market Portfolio
Retirement Government Money Market Portfolio (the funds)
File No. (2-62417) and (811-2861)
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Ladies and Gentlemen:
Transmitted herewith pursuant to Rule 497(j) under the Securities Act
of 1933 is certification that the Prospectuses and Statement of
Additional Information with respect to the above referenced fundS do
not differ from those filed in the most recent post-effective
amendment, which was filed electronically.
Very truly yours,
/s/Arthur S. Loring
Arthur S. Loring
Secretary