<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000276516
<NAME> Fidelity Money Market Trust
<SERIES>
<NUMBER> 41
<NAME> Retirement Money Market Portfolio
<MULTIPLIER> 1,000
<S>
<C>
<PERIOD-TYPE>
YEAR
<FISCAL-YEAR-END>
AUG-31-2000
<PERIOD-END>
AUG-31-2000
<INVESTMENTS-AT-COST>
10,194,382
<INVESTMENTS-AT-VALUE>
10,194,382
<RECEIVABLES>
128,788
<ASSETS-OTHER>
0
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
10,323,170
<PAYABLE-FOR-SECURITIES>
0
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
80,753
<TOTAL-LIABILITIES>
80,753
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
10,242,814
<SHARES-COMMON-STOCK>
10,242,742
<SHARES-COMMON-PRIOR>
10,310,658
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(397)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
10,242,417
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
636,206
<OTHER-INCOME>
0
<EXPENSES-NET>
39,628
<NET-INVESTMENT-INCOME>
596,578
<REALIZED-GAINS-CURRENT>
(143)
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
596,435
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
596,578
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
18,811,440
<NUMBER-OF-SHARES-REDEEMED>
19,475,728
<SHARES-REINVESTED>
596,372
<NET-CHANGE-IN-ASSETS>
(68,058)
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(255)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
43,511
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
43,546
<AVERAGE-NET-ASSETS>
10,367,279
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.058
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.058
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
42
</TABLE>
