FIDELITY (LOGO) INVESTMENTS(registered trademark) FMR Corp.
82 Devonshire Street
Boston MA 02109-3614
617 563 7000
October 23, 1998
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):
Fidelity Retirement Government Money Market Portfolio and
Retirement 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/Eric D. Roiter
Eric D. Roiter
Secretary
