<PAGE> PAGE 1
000 B000000 08/31/96
000 C000000 0000276516
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 FIDELITY MONEY MARKET TRUST
001 B000000 811-2861
001 C000000 9725844081
002 A000000 1201 MARKET STREET, P.O. BOX 1347
002 B000000 WILMINGTON
002 C000000 DE
002 D010000 19899
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 3
007 C010100 1
007 C010200 2
007 C010300 3
007 C020300 RATED MONEY MARKET
007 C030300 N
007 C010400 4
007 C020400 RETIREMENT MONEY MARKET PORTFOLIO
007 C030400 N
007 C010500 5
007 C020500 RETIREMENT GOVERNMENT MONEY MARKET PORTFOLIO
007 C030500 N
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A00AA01 FIDELITY MANAGEMENT & RESEARCH COMPANY
008 B00AA01 A
008 C00AA01 801-7884
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02109
008 A00AA02 FMR TEXAS INC.
008 B00AA02 S
008 C00AA02 801-3720
008 D01AA02 IRVING
008 D02AA02 TX
008 D03AA02 75039
011 A00AA01 FIDELITY DISTRIBUTORS CORPORATION
<PAGE> PAGE 2
011 B00AA01 8-8775
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02109
012 A00AA01 FIDELITY INVESTMENTS INSTIT. OPERATIONS CO.
012 B00AA01 84-00216
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02109
013 A00AA01 COOPERS & LYBRAND L.L.P.
013 B01AA01 DALLAS
013 B02AA01 TX
013 B03AA01 75201
014 A00AA01 FIDELITY DISTRIBUTORS CORPORATION
014 B00AA01 8-8775
014 A00AA02 DELETE
015 A00AA01 THE BANK OF NEW YORK
015 B00AA01 C
015 C01AA01 NEW YORK
015 C02AA01 NY
015 C03AA01 10260
015 E01AA01 X
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 229
019 C00AA00 FIDELITYZZ
020 C000001 0
020 C000002 0
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 0
022 A000001 GOLDMAN SACHS & CO.
022 B000001 13-5108880
022 C000001 3541189
022 D000001 263762
022 A000002 FIRST BOSTON CORPORATION
022 B000002 13-5659485
022 C000002 2652628
022 D000002 366072
022 A000003 LEHMAN BROTHERS INC.
022 B000003 13-2518466
022 C000003 1878561
022 D000003 831420
022 A000004 MORGAN (J.P.) SECURITIES
022 B000004 13-3224016
<PAGE> PAGE 3
022 C000004 2235784
022 D000004 446418
022 A000005 MERRILL LYNCH PIERCE, FENNER & SMITH
022 B000005 13-5674085
022 C000005 1517337
022 D000005 1034223
022 A000006 MORGAN STANLEY & CO. INC.
022 B000006 13-2655998
022 C000006 1110421
022 D000006 989445
022 A000007 PRUDENTIAL-BACHE SECURITIES
022 B000007 22-2347336
022 C000007 465867
022 D000007 570157
022 A000008 GENERAL MOTORS ACCEPTANCE CORP.
022 B000008 38-0572512
022 C000008 959126
022 D000008 0
022 A000009 FORD MOTOR CREDIT CORPORATION
022 B000009 38-1612444
022 C000009 948376
022 D000009 0
022 A000010 SANWA BANK-BKG SECURITIES CO. L.P.
022 B000010 13-3046258
022 C000010 693511
022 D000010 243046
023 C000000 195021759
023 D000000 7512007
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 Y
026 G010000 N
026 G020000 N
026 H000000 Y
027 000000 Y
029 00AA00 N
030 A00AA00 0
030 B00AA00 0.00
030 C00AA00 0.00
031 A00AA00 0
031 B00AA00 0
032 00AA00 0
033 00AA00 0
034 00AA00 N
035 00AA00 0
036 B00AA00 0
037 00AA00 N
038 00AA00 0
<PAGE> PAGE 4
039 00AA00 N
040 00AA00 Y
041 00AA00 N
045 00AA00 Y
046 00AA00 N
047 00AA00 Y
048 00AA00 0.420
048 A01AA00 0
048 A02AA00 0.000
048 B01AA00 0
048 B02AA00 0.000
048 C01AA00 0
048 C02AA00 0.000
048 D01AA00 0
048 D02AA00 0.000
048 E01AA00 0
048 E02AA00 0.000
048 F01AA00 0
048 F02AA00 0.000
048 G01AA00 0
048 G02AA00 0.000
048 H01AA00 0
048 H02AA00 0.000
048 I01AA00 0
048 I02AA00 0.000
048 J01AA00 0
048 J02AA00 0.000
048 K01AA00 0
048 K02AA00 0.000
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
054 D00AA00 Y
054 E00AA00 Y
054 F00AA00 Y
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 Y
054 L00AA00 Y
054 M00AA00 Y
054 N00AA00 Y
054 O00AA00 Y
055 A00AA00 N
055 B00AA00 N
056 00AA00 Y
057 00AA00 N
058 A00AA00 N
059 00AA00 Y
060 A00AA00 Y
<PAGE> PAGE 5
060 B00AA00 Y
061 00AA00 100000
066 A00AA00 N
067 00AA00 N
068 A00AA00 N
068 B00AA00 N
069 00AA00 N
077 A000000 Y
077 B000000 Y
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 A00AA00 FEDERAL INSURANCE COMPANY
080 B00AA00 NATIONAL UNION INSURANCE COMPANY
080 C00AA00 220
081 A00AA00 Y
081 B00AA00 226
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
<PAGE> PAGE 6
086 F020000 0
062 A000300 Y
062 B000300 0.0
062 C000300 0.0
062 D000300 0.0
062 E000300 0.0
062 F000300 0.0
062 G000300 0.0
062 H000300 0.0
062 I000300 0.0
062 J000300 0.0
062 K000300 0.0
062 L000300 0.0
062 M000300 0.0
062 N000300 0.0
062 O000300 0.0
062 P000300 0.0
062 Q000300 0.0
062 R000300 0.0
063 A000300 0
063 B000300 0.0
071 A000300 0
071 B000300 0
071 C000300 0
071 D000300 0
072 A000300 0
072 B000300 0
072 C000300 0
072 D000300 0
072 E000300 0
072 F000300 0
072 G000300 0
072 H000300 0
072 I000300 0
072 J000300 0
072 K000300 0
072 L000300 0
072 M000300 0
072 N000300 0
072 O000300 0
072 P000300 0
072 Q000300 0
072 R000300 0
072 S000300 0
072 T000300 0
072 U000300 0
072 V000300 0
072 W000300 0
072 X000300 0
072 Y000300 0
072 Z000300 0
<PAGE> PAGE 7
072AA000300 0
072BB000300 0
072CC010300 0
072CC020300 0
072DD010300 0
072DD020300 0
072EE000300 0
073 A010300 0.0000
073 A020300 0.0000
073 B000300 0.0000
073 C000300 0.0000
074 A000300 0
074 B000300 0
074 C000300 0
074 D000300 0
074 E000300 0
074 F000300 0
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 0
074 K000300 0
074 L000300 0
074 M000300 0
074 N000300 0
074 O000300 0
074 P000300 0
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 0
074 S000300 0
074 T000300 0
074 U010300 0
074 U020300 0
074 V010300 0.00
074 V020300 0.00
074 W000300 0.0000
074 X000300 0
074 Y000300 0
075 A000300 0
075 B000300 0
076 000300 0.00
024 000400 Y
025 A000401 GOLDMAN SACHS & CO.
025 B000401 13-5108880
025 C000401 D
025 D000401 64926
025 A000402 GENERAL MOTORS ACCEPTANCE
025 B000402 38-0572512
<PAGE> PAGE 8
025 C000402 D
025 D000402 155775
025 A000403 MORGAN (J.P.) SECURITIES
025 B000403 13-3224016
025 C000403 D
025 D000403 84000
025 A000404 MORGAN STANLEY & CO. INC.
025 B000404 13-2655998
025 C000404 D
025 D000404 19853
025 A000405 FORD MOTOR CREDIT CORPORATION
025 B000405 38-1612444
025 C000405 D
025 D000405 46680
025 A000406 MERRILL LYNCH PIERCE, FENNER & SMITH
025 B000406 13-5674085
025 C000406 D
025 D000406 46965
025 A000407 DELETE
025 D000407 0
025 D000408 0
028 A010400 766993
028 A020400 20235
028 A030400 0
028 A040400 337587
028 B010400 1149011
028 B020400 20450
028 B030400 0
028 B040400 445104
028 C010400 390364
028 C020400 23409
028 C030400 0
028 C040400 752476
028 D010400 197824
028 D020400 21842
028 D030400 0
028 D040400 305348
028 E010400 536013
028 E020400 22985
028 E030400 0
028 E040400 418691
028 F010400 284002
028 F020400 23407
028 F030400 0
028 F040400 293499
028 G010400 3324207
028 G020400 132328
028 G030400 0
028 G040400 2552705
028 H000400 0
042 A000400 0
<PAGE> PAGE 9
042 B000400 0
042 C000400 0
042 D000400 0
042 E000400 0
042 F000400 0
042 G000400 0
042 H000400 0
043 000400 0
044 000400 37
049 000400 N
050 000400 N
051 000400 N
052 000400 N
053 A000400 Y
053 B000400 Y
053 C000400 N
062 A000400 Y
062 B000400 0.8
062 C000400 23.3
062 D000400 5.4
062 E000400 0.1
062 F000400 1.2
062 G000400 20.8
062 H000400 0.3
062 I000400 23.4
062 J000400 3.2
062 K000400 0.0
062 L000400 21.5
062 M000400 0.0
062 N000400 0.0
062 O000400 0.0
062 P000400 0.0
062 Q000400 0.0
062 R000400 0.0
063 A000400 40
063 B000400 0.0
064 A000400 Y
064 B000400 N
070 A010400 Y
070 A020400 Y
070 B010400 N
070 B020400 N
070 C010400 N
070 C020400 N
070 D010400 N
070 D020400 N
070 E010400 N
070 E020400 N
070 F010400 N
070 F020400 N
070 G010400 N
<PAGE> PAGE 10
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 N
070 M020400 N
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
071 A000400 0
071 B000400 0
071 C000400 0
071 D000400 0
072 A000400 12
072 B000400 272488
072 C000400 0
072 D000400 0
072 E000400 0
072 F000400 20244
072 G000400 0
072 H000400 0
072 I000400 0
072 J000400 0
072 K000400 0
072 L000400 0
072 M000400 20
072 N000400 0
072 O000400 0
072 P000400 0
072 Q000400 0
072 R000400 0
072 S000400 0
072 T000400 0
072 U000400 0
072 V000400 0
072 W000400 0
072 X000400 20264
<PAGE> PAGE 11
072 Y000400 3941
072 Z000400 256165
072AA000400 0
072BB000400 42
072CC010400 0
072CC020400 0
072DD010400 256165
072DD020400 0
072EE000400 0
073 A010400 0.0527
073 A020400 0.0000
073 B000400 0.0000
073 C000400 0.0000
074 A000400 3967
074 B000400 286564
074 C000400 5023767
074 D000400 0
074 E000400 0
074 F000400 0
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 0
074 K000400 0
074 L000400 31895
074 M000400 0
074 N000400 5346193
074 O000400 15000
074 P000400 1901
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 2035
074 S000400 0
074 T000400 5327257
074 U010400 5327506
074 U020400 0
074 V010400 1.00
074 V020400 0.00
074 W000400 1.0002
074 X000400 1049657
074 Y000400 0
075 A000400 4824361
075 B000400 0
076 000400 0.00
024 000500 N
028 A010500 158096
028 A020500 10029
028 A030500 0
028 A040500 146077
<PAGE> PAGE 12
028 B010500 238749
028 B020500 10024
028 B030500 0
028 B040500 172920
028 C010500 149329
028 C020500 10205
028 C030500 0
028 C040500 206222
028 D010500 192752
028 D020500 10266
028 D030500 0
028 D040500 121025
028 E010500 262222
028 E020500 10922
028 E030500 0
028 E040500 188319
028 F010500 130071
028 F020500 11134
028 F030500 0
028 F040500 167064
028 G010500 1131219
028 G020500 62580
028 G030500 0
028 G040500 1001627
028 H000500 0
042 A000500 0
042 B000500 0
042 C000500 0
042 D000500 0
042 E000500 0
042 F000500 0
042 G000500 0
042 H000500 0
043 000500 0
044 000500 44
049 000500 N
050 000500 N
051 000500 N
052 000500 N
053 A000500 Y
053 B000500 Y
053 C000500 N
062 A000500 Y
062 B000500 6.7
062 C000500 66.3
062 D000500 26.7
062 E000500 0.0
062 F000500 0.0
062 G000500 0.0
062 H000500 0.0
062 I000500 0.0
<PAGE> PAGE 13
062 J000500 0.0
062 K000500 0.0
062 L000500 0.3
062 M000500 0.0
062 N000500 0.0
062 O000500 0.0
062 P000500 0.0
062 Q000500 0.0
062 R000500 0.0
063 A000500 38
063 B000500 0.0
064 A000500 Y
064 B000500 N
070 A010500 Y
070 A020500 Y
070 B010500 N
070 B020500 N
070 C010500 N
070 C020500 N
070 D010500 N
070 D020500 N
070 E010500 N
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 N
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 Y
070 K010500 Y
070 K020500 N
070 L010500 N
070 L020500 N
070 M010500 N
070 M020500 N
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 Y
070 P020500 N
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
071 A000500 0
071 B000500 0
<PAGE> PAGE 14
071 C000500 0
071 D000500 0
072 A000500 12
072 B000500 134457
072 C000500 0
072 D000500 0
072 E000500 0
072 F000500 10050
072 G000500 0
072 H000500 0
072 I000500 0
072 J000500 0
072 K000500 0
072 L000500 0
072 M000500 10
072 N000500 0
072 O000500 0
072 P000500 0
072 Q000500 0
072 R000500 0
072 S000500 0
072 T000500 0
072 U000500 0
072 V000500 0
072 W000500 0
072 X000500 10060
072 Y000500 1917
072 Z000500 126314
072AA000500 0
072BB000500 1
072CC010500 0
072CC020500 0
072DD010500 126314
072DD020500 0
072EE000500 0
073 A010500 0.0523
073 A020500 0.0000
073 B000500 0.0000
073 C000500 0.0000
074 A000500 0
074 B000500 708550
074 C000500 1945761
074 D000500 0
074 E000500 0
074 F000500 0
074 G000500 0
074 H000500 0
074 I000500 0
074 J000500 0
074 K000500 0
074 L000500 9798
<PAGE> PAGE 15
074 M000500 0
074 N000500 2664109
074 O000500 120893
074 P000500 913
074 Q000500 0
074 R010500 0
074 R020500 0
074 R030500 0
074 R040500 19696
074 S000500 0
074 T000500 2522607
074 U010500 2522845
074 U020500 0
074 V010500 1.00
074 V020500 0.00
074 W000500 1.0004
074 X000500 590793
074 Y000500 0
075 A000500 2395203
075 B000500 0
076 000500 0.00
SIGNATURE JOHN H. COSTELLO
TITLE ASSISTANT TREASURER
<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-31-1996
<PERIOD-END>
Aug-31-1996
<INVESTMENTS-AT-COST>
5,310,331
<INVESTMENTS-AT-VALUE>
5,310,331
<RECEIVABLES>
31,895
<ASSETS-OTHER>
3,967
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
5,346,193
<PAYABLE-FOR-SECURITIES>
15,000
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
3,936
<TOTAL-LIABILITIES>
18,936
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
5,327,506
<SHARES-COMMON-STOCK>
5,327,506
<SHARES-COMMON-PRIOR>
4,350,048
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(249)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
5,327,257
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
272,488
<OTHER-INCOME>
0
<EXPENSES-NET>
16,323
<NET-INVESTMENT-INCOME>
256,165
<REALIZED-GAINS-CURRENT>
(42)
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
256,123
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
256,165
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
5,429,621
<NUMBER-OF-SHARES-REDEEMED>
4,704,989
<SHARES-REINVESTED>
252,826
<NET-CHANGE-IN-ASSETS>
977,416
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(207)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
20,244
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
20,264
<AVERAGE-NET-ASSETS>
4,824,361
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.053
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.053
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
34
<AVG-DEBT-OUTSTANDING>
0
<AVG-DEBT-PER-SHARE>
0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000276516
<NAME> Fidelity Money Market Trust
<SERIES>
<NUMBER> 51
<NAME> Retirement Government Money Market Portfolio
<MULTIPLIER> 1,000
<S>
<C>
<PERIOD-TYPE>
year
<FISCAL-YEAR-END>
Aug-31-1996
<PERIOD-END>
Aug-31-1996
<INVESTMENTS-AT-COST>
2,654,311
<INVESTMENTS-AT-VALUE>
2,654,311
<RECEIVABLES>
9,798
<ASSETS-OTHER>
0
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
2,664,109
<PAYABLE-FOR-SECURITIES>
120,893
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
20,609
<TOTAL-LIABILITIES>
141,502
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
2,522,845
<SHARES-COMMON-STOCK>
2,522,845
<SHARES-COMMON-PRIOR>
2,270,613
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(238)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
2,522,607
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
134,457
<OTHER-INCOME>
0
<EXPENSES-NET>
8,143
<NET-INVESTMENT-INCOME>
126,314
<REALIZED-GAINS-CURRENT>
(1)
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
126,313
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
126,314
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
2,194,071
<NUMBER-OF-SHARES-REDEEMED>
2,066,691
<SHARES-REINVESTED>
124,852
<NET-CHANGE-IN-ASSETS>
252,231
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(237)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
10,050
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
10,060
<AVERAGE-NET-ASSETS>
2,395,203
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.052
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.052
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
34
<AVG-DEBT-OUTSTANDING>
0
<AVG-DEBT-PER-SHARE>
0
</TABLE>
