FIDELITY (LOGO) FMR Corp. 82 Devonshire
INVESTMENTS(registered Street Boston MA 02109-3614
trademark) 617 563 7000
October 25, 1999
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 Government Money
Market Portfolio
Retirement Money Market
Portfolio (the funds)
File Nos. 2-62417 and 811-2861
______________________________________________________________________
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
