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<PAGE> PAGE 18
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<PAGE> PAGE 21
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<PAGE> PAGE 22
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008 A000501 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
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<PAGE> PAGE 23
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<PAGE> PAGE 24
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<PAGE> PAGE 25
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<PAGE> PAGE 26
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008 A000601 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B000601 A
008 C000601 801-8059
008 D010601 SPRINGFIELD
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008 D030601 01111
008 A000602 CONCERT CAPITAL MANANGEMENT, INC.
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<PAGE> PAGE 27
008 D020602 MA
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015 A000601 INVESTORS BANK & TRUST COMPANY
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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<PAGE> PAGE 30
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008 A000701 MASSMUTUAL LIFE INSURANCE COMPANY
008 B000701 A
<PAGE> PAGE 31
008 C000701 801-8059
008 D010701 SPRINGFIELD
008 D020701 MA
008 D030701 01111
008 A000702 HARBOURVIEW ASSET MANAGEMENT CORPORATION
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008 D020702 NY
008 D030702 10048
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015 A000701 INVESTORS BANK & TRUST COMPANY
015 B000701 C
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015 A000702 CITIBANK
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015 C020702 NY
015 C030702 10043
015 E040702 X
015 A000703 CHASE MANHATTAN BANK
015 B000703 S
015 C010703 NEW YORK
015 C020703 NY
015 C030703 11245
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015 A000704 NATIONAL AUSTRAILIAN BANK
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015 C010704 MELBOURNE
015 D010704 AUSTRAILIA
015 D020704 VICTORIA 3000
015 E040704 X
015 A000705 EUROCLEAR
015 B000705 S
015 C010705 BRUSSELS
015 D010705 BELGIUM
015 E040705 X
015 A000706 STANDARD CHARTERED BANK
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015 D020706 EC2V 7SB
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015 A000707 BANK OF BOSTON
015 B000707 S
015 C010707 BOSTON
015 C020707 MA
015 C030707 02110
<PAGE> PAGE 32
015 E040707 X
015 A000708 BANK OF IRELAND
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015 D010708 IRELAND
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015 A000709 BANCOMER SA
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015 A000710 BARCLAYS BANK
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<PAGE> PAGE 33
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<PAGE> PAGE 34
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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SIGNATURE STEPHEN KUHN
TITLE VICE PRESIDENT
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 31
<NAME> Core Bond Fund, Class 1
<S> <C>
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<PERIOD-END> JUN-30-1995
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<OVERDISTRIBUTION-GAINS> 0
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<PER-SHARE-NAV-BEGIN> 9.90
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 32
<NAME> Core Bond Fund, Class 2
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 198,626,166
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<SHARES-COMMON-PRIOR> 10,208
<ACCUMULATED-NII-CURRENT> 6,813,754
<OVERDISTRIBUTION-NII> 0
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<OVERDISTRIBUTION-GAINS> 0
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<EXPENSES-NET> 581
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<REALIZED-GAINS-CURRENT> 1,667
<APPREC-INCREASE-CURRENT> 6,714
<NET-CHANGE-FROM-OPS> 11,700
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 11,700
<ACCUMULATED-NII-PRIOR> 13,385
<ACCUMULATED-GAINS-PRIOR> (165,909)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 446,446
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 556,885
<AVERAGE-NET-ASSETS> 106,769
<PER-SHARE-NAV-BEGIN> 9.90
<PER-SHARE-NII> 0.33
<PER-SHARE-GAIN-APPREC> 0.82
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.05
<EXPENSE-RATIO> 1.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 33
<NAME> Core Bond Fund, Class 3
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 198,626,166
<INVESTMENTS-AT-VALUE> 207,664,090
<RECEIVABLES> 16,207,254
<ASSETS-OTHER> 4,864
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 223,876,208
<PAYABLE-FOR-SECURITIES> 10,739,796
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 187,004
<TOTAL-LIABILITIES> 10,926,800
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 193,540,284
<SHARES-COMMON-STOCK> 10,201
<SHARES-COMMON-PRIOR> 10,201
<ACCUMULATED-NII-CURRENT> 6,813,754
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,914,186
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,681,184
<NET-ASSETS> 112,923
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,902
<OTHER-INCOME> 0
<EXPENSES-NET> 397
<NET-INVESTMENT-INCOME> 3,505
<REALIZED-GAINS-CURRENT> 1,668
<APPREC-INCREASE-CURRENT> 6,718
<NET-CHANGE-FROM-OPS> 11,891
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 11,891
<ACCUMULATED-NII-PRIOR> 13,385
<ACCUMULATED-GAINS-PRIOR> (165,909)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 446,446
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 556,885
<AVERAGE-NET-ASSETS> 106,827
<PER-SHARE-NAV-BEGIN> 9.90
<PER-SHARE-NII> 0.34
<PER-SHARE-GAIN-APPREC> 0.83
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.07
<EXPENSE-RATIO> 0.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 34
<NAME> Core Bond Fund, Class 4
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 198,626,166
<INVESTMENTS-AT-VALUE> 207,664,090
<RECEIVABLES> 16,207,254
<ASSETS-OTHER> 4,864
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 223,876,208
<PAYABLE-FOR-SECURITIES> 10,739,796
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 187,004
<TOTAL-LIABILITIES> 10,926,800
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 193,540,284
<SHARES-COMMON-STOCK> 19,299,303
<SHARES-COMMON-PRIOR> 19,724,656
<ACCUMULATED-NII-CURRENT> 6,813,754
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,914,186
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,681,184
<NET-ASSETS> 212,568,776
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7,298,658
<OTHER-INCOME> 0
<EXPENSES-NET> 508,134
<NET-INVESTMENT-INCOME> 6,790,524
<REALIZED-GAINS-CURRENT> 3,075,098
<APPREC-INCREASE-CURRENT> 12,560,467
<NET-CHANGE-FROM-OPS> 22,426,089
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,139,813
<NUMBER-OF-SHARES-REDEEMED> 4,565,167
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 18,418,480
<ACCUMULATED-NII-PRIOR> 13,385
<ACCUMULATED-GAINS-PRIOR> (165,909)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 446,446
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 556,885
<AVERAGE-NET-ASSETS> 199,744,579
<PER-SHARE-NAV-BEGIN> 9.84
<PER-SHARE-NII> 0.35
<PER-SHARE-GAIN-APPREC> 0.82
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.01
<EXPENSE-RATIO> 0.51
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 51
<NAME> Value Equity Fund, Class 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 1,622,137,353
<INVESTMENTS-AT-VALUE> 1,832,724,937
<RECEIVABLES> 9,020,842
<ASSETS-OTHER> 783,526
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,842,529,305
<PAYABLE-FOR-SECURITIES> 2,702,361
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 3,603,830
<TOTAL-LIABILITIES> 6,306,191
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,594,211,248
<SHARES-COMMON-STOCK> 10,018
<SHARES-COMMON-PRIOR> 10,018
<ACCUMULATED-NII-CURRENT> 23,767,392
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7,656,890
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 210,587,584
<NET-ASSETS> 114,856
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,751
<OTHER-INCOME> 0
<EXPENSES-NET> 877
<NET-INVESTMENT-INCOME> 874
<REALIZED-GAINS-CURRENT> 511
<APPREC-INCREASE-CURRENT> 14,121
<NET-CHANGE-FROM-OPS> 15,506
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 15,506
<ACCUMULATED-NII-PRIOR> 148,716
<ACCUMULATED-GAINS-PRIOR> (508,693)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,818,792
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,721,968
<AVERAGE-NET-ASSETS> 107,291
<PER-SHARE-NAV-BEGIN> 9.92
<PER-SHARE-NII> 0.09
<PER-SHARE-GAIN-APPREC> 1.45
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.46
<EXPENSE-RATIO> 1.65
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 52
<NAME> Value Equity Fund, Class 2
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 1,622,137,353
<INVESTMENTS-AT-VALUE> 1,832,724,937
<RECEIVABLES> 9,020,842
<ASSETS-OTHER> 783,526
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,842,529,305
<PAYABLE-FOR-SECURITIES> 2,702,361
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 3,603,830
<TOTAL-LIABILITIES> 6,306,191
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,594,211,248
<SHARES-COMMON-STOCK> 10,017
<SHARES-COMMON-PRIOR> 10,017
<ACCUMULATED-NII-CURRENT> 23,767,392
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7,656,890
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 210,587,584
<NET-ASSETS> 115,274
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,754
<OTHER-INCOME> 0
<EXPENSES-NET> 585
<NET-INVESTMENT-INCOME> 1,169
<REALIZED-GAINS-CURRENT> 510
<APPREC-INCREASE-CURRENT> 14,155
<NET-CHANGE-FROM-OPS> 15,834
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 15,834
<ACCUMULATED-NII-PRIOR> 148,716
<ACCUMULATED-GAINS-PRIOR> (508,693)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,818,792
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,721,968
<AVERAGE-NET-ASSETS> 107,538
<PER-SHARE-NAV-BEGIN> 9.93
<PER-SHARE-NII> 0.12
<PER-SHARE-GAIN-APPREC> 1.46
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.51
<EXPENSE-RATIO> 1.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 53
<NAME> Value Equity Fund, Class 3
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 1,622,137,353
<INVESTMENTS-AT-VALUE> 1,832,724,937
<RECEIVABLES> 9,020,842
<ASSETS-OTHER> 783,526
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,842,529,305
<PAYABLE-FOR-SECURITIES> 2,702,361
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 3,603,830
<TOTAL-LIABILITIES> 6,306,191
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,594,211,248
<SHARES-COMMON-STOCK> 10,002
<SHARES-COMMON-PRIOR> 10,002
<ACCUMULATED-NII-CURRENT> 23,767,392
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7,656,890
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 210,587,584
<NET-ASSETS> 115,339
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,754
<OTHER-INCOME> 0
<EXPENSES-NET> 399
<NET-INVESTMENT-INCOME> 1,355
<REALIZED-GAINS-CURRENT> 512
<APPREC-INCREASE-CURRENT> 14,147
<NET-CHANGE-FROM-OPS> 16,014
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 16,014
<ACCUMULATED-NII-PRIOR> 148,716
<ACCUMULATED-GAINS-PRIOR> (508,693)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,818,792
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,721,968
<AVERAGE-NET-ASSETS> 107,507
<PER-SHARE-NAV-BEGIN> 9.93
<PER-SHARE-NII> 0.14
<PER-SHARE-GAIN-APPREC> 1.46
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.53
<EXPENSE-RATIO> 0.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 54
<NAME> Value Equity Fund, Class 4
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 1,622,137,353
<INVESTMENTS-AT-VALUE> 1,832,724,937
<RECEIVABLES> 9,020,842
<ASSETS-OTHER> 783,526
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,842,529,305
<PAYABLE-FOR-SECURITIES> 2,702,361
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 3,603,830
<TOTAL-LIABILITIES> 6,306,191
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,594,211,248
<SHARES-COMMON-STOCK> 159,371,793
<SHARES-COMMON-PRIOR> 157,806,039
<ACCUMULATED-NII-CURRENT> 23,767,392
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7,656,890
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 210,587,584
<NET-ASSETS> 1,835,877,645
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 27,914,428
<OTHER-INCOME> 0
<EXPENSES-NET> 4,299,150
<NET-INVESTMENT-INCOME> 23,615,278
<REALIZED-GAINS-CURRENT> 8,164,035
<APPREC-INCREASE-CURRENT> 224,866,527
<NET-CHANGE-FROM-OPS> 256,645,840
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 20,093,130
<NUMBER-OF-SHARES-REDEEMED> 18,527,378
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 272,315,131
<ACCUMULATED-NII-PRIOR> 148,716
<ACCUMULATED-GAINS-PRIOR> (508,693)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,818,792
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,721,968
<AVERAGE-NET-ASSETS> 1,710,983,978
<PER-SHARE-NAV-BEGIN> 9.91
<PER-SHARE-NII> 0.15
<PER-SHARE-GAIN-APPREC> 1.46
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.52
<EXPENSE-RATIO> 0.51
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 11
<NAME> Prime Fund, Class 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 240,531,699
<INVESTMENTS-AT-VALUE> 240,528,053
<RECEIVABLES> 2,919,400
<ASSETS-OTHER> 2,181
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 243,449,634
<PAYABLE-FOR-SECURITIES> 954,832
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 113,638
<TOTAL-LIABILITIES> 1,068,470
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 236,536,489
<SHARES-COMMON-STOCK> 670
<SHARES-COMMON-PRIOR> 670
<ACCUMULATED-NII-CURRENT> 5,848,622
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (301)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,646)
<NET-ASSETS> 103,163
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,165
<OTHER-INCOME> 0
<EXPENSES-NET> 832
<NET-INVESTMENT-INCOME> 2,333
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 1
<NET-CHANGE-FROM-OPS> 2,334
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 2,334
<ACCUMULATED-NII-PRIOR> 23,163
<ACCUMULATED-GAINS-PRIOR> (302)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 455,606
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 557,981
<AVERAGE-NET-ASSETS> 101,982
<PER-SHARE-NAV-BEGIN> 150.39
<PER-SHARE-NII> 3.48
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 153.87
<EXPENSE-RATIO> 1.65
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 12
<NAME> Prime Fund, Class 2
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 240,531,699
<INVESTMENTS-AT-VALUE> 240,528,053
<RECEIVABLES> 2,919,400
<ASSETS-OTHER> 2,181
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 243,449,634
<PAYABLE-FOR-SECURITIES> 954,832
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 113,638
<TOTAL-LIABILITIES> 1,068,470
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 236,536,489
<SHARES-COMMON-STOCK> 670
<SHARES-COMMON-PRIOR> 670
<ACCUMULATED-NII-CURRENT> 5,848,622
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (301)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,646)
<NET-ASSETS> 103,539
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,173
<OTHER-INCOME> 0
<EXPENSES-NET> 556
<NET-INVESTMENT-INCOME> 2,617
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 1
<NET-CHANGE-FROM-OPS> 2,618
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 2,618
<ACCUMULATED-NII-PRIOR> 23,163
<ACCUMULATED-GAINS-PRIOR> (302)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 455,606
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 557,981
<AVERAGE-NET-ASSETS> 102,213
<PER-SHARE-NAV-BEGIN> 150.56
<PER-SHARE-NII> 3.90
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 154.46
<EXPENSE-RATIO> 1.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 13
<NAME> Prime Fund, Class 3
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 240,531,699
<INVESTMENTS-AT-VALUE> 240,528,053
<RECEIVABLES> 2,919,400
<ASSETS-OTHER> 2,181
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 243,449,634
<PAYABLE-FOR-SECURITIES> 954,832
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 113,638
<TOTAL-LIABILITIES> 1,068,470
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 236,536,489
<SHARES-COMMON-STOCK> 669
<SHARES-COMMON-PRIOR> 669
<ACCUMULATED-NII-CURRENT> 5,848,622
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (301)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,646)
<NET-ASSETS> 103,605
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,172
<OTHER-INCOME> 0
<EXPENSES-NET> 380
<NET-INVESTMENT-INCOME> 2,792
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 1
<NET-CHANGE-FROM-OPS> 2,793
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 2,793
<ACCUMULATED-NII-PRIOR> 23,163
<ACCUMULATED-GAINS-PRIOR> (302)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 455,606
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 557,981
<AVERAGE-NET-ASSETS> 102,189
<PER-SHARE-NAV-BEGIN> 150.61
<PER-SHARE-NII> 4.17
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 154.78
<EXPENSE-RATIO> 0.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 14
<NAME> Prime Fund, Class 4
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 240,531,699
<INVESTMENTS-AT-VALUE> 240,528,053
<RECEIVABLES> 2,919,400
<ASSETS-OTHER> 2,181
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 243,449,634
<PAYABLE-FOR-SECURITIES> 954,832
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 113,638
<TOTAL-LIABILITIES> 1,068,470
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 236,536,489
<SHARES-COMMON-STOCK> 1,564,706
<SHARES-COMMON-PRIOR> 1,134,253
<ACCUMULATED-NII-CURRENT> 5,848,622
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (301)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,646)
<NET-ASSETS> 242,070,857
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6,339,364
<OTHER-INCOME> 0
<EXPENSES-NET> 521,645
<NET-INVESTMENT-INCOME> 5,817,719
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 426
<NET-CHANGE-FROM-OPS> 5,818,145
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,141,961
<NUMBER-OF-SHARES-REDEEMED> 711,508
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 71,522,983
<ACCUMULATED-NII-PRIOR> 23,163
<ACCUMULATED-GAINS-PRIOR> (302)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 455,606
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 557,981
<AVERAGE-NET-ASSETS> 203,863,246
<PER-SHARE-NAV-BEGIN> 150.36
<PER-SHARE-NII> 4.36
<PER-SHARE-GAIN-APPREC> (0.01)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 154.71
<EXPENSE-RATIO> 0.52
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 61
<NAME> Small CAP Value Equity Fund, Class 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 333,465,381
<INVESTMENTS-AT-VALUE> 348,560,663
<RECEIVABLES> 3,067,594
<ASSETS-OTHER> 2,885
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 351,631,142
<PAYABLE-FOR-SECURITIES> 1,969,993
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 293,859
<TOTAL-LIABILITIES> 2,263,852
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 333,831,043
<SHARES-COMMON-STOCK> 14,266
<SHARES-COMMON-PRIOR> 10,235
<ACCUMULATED-NII-CURRENT> 3,051,714
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,610,749)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 15,095,282
<NET-ASSETS> 148,341
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,243
<OTHER-INCOME> 0
<EXPENSES-NET> 881
<NET-INVESTMENT-INCOME> 362
<REALIZED-GAINS-CURRENT> (574)
<APPREC-INCREASE-CURRENT> 7,490
<NET-CHANGE-FROM-OPS> 7,278
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,031
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 49,190
<ACCUMULATED-NII-PRIOR> 28,759
<ACCUMULATED-GAINS-PRIOR> (809,930)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 894,791
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,074,462
<AVERAGE-NET-ASSETS> 101,707
<PER-SHARE-NAV-BEGIN> 9.69
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 0.67
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.40
<EXPENSE-RATIO> 1.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 62
<NAME> Small CAP Value Equity Fund, Class 2
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 333,465,381
<INVESTMENTS-AT-VALUE> 348,560,663
<RECEIVABLES> 3,067,594
<ASSETS-OTHER> 2,885
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 351,631,142
<PAYABLE-FOR-SECURITIES> 1,969,993
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 293,859
<TOTAL-LIABILITIES> 2,263,852
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 333,831,043
<SHARES-COMMON-STOCK> 10,233
<SHARES-COMMON-PRIOR> 10,233
<ACCUMULATED-NII-CURRENT> 3,051,714
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,610,749)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 15,095,282
<NET-ASSETS> 106,812
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,246
<OTHER-INCOME> 0
<EXPENSES-NET> 605
<NET-INVESTMENT-INCOME> 641
<REALIZED-GAINS-CURRENT> (574)
<APPREC-INCREASE-CURRENT> 7,504
<NET-CHANGE-FROM-OPS> 7,571
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 7,571
<ACCUMULATED-NII-PRIOR> 28,759
<ACCUMULATED-GAINS-PRIOR> (809,930)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 894,791
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,074,462
<AVERAGE-NET-ASSETS> 101,935
<PER-SHARE-NAV-BEGIN> 9.70
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> 0.68
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.44
<EXPENSE-RATIO> 1.20
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 63
<NAME> Small CAP Value Equity Fund, Class 3
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 333,465,381
<INVESTMENTS-AT-VALUE> 348,560,663
<RECEIVABLES> 3,067,594
<ASSETS-OTHER> 2,885
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 351,631,142
<PAYABLE-FOR-SECURITIES> 1,969,993
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 293,859
<TOTAL-LIABILITIES> 2,263,852
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 333,831,043
<SHARES-COMMON-STOCK> 10,236
<SHARES-COMMON-PRIOR> 10,236
<ACCUMULATED-NII-CURRENT> 3,051,714
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,610,749)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 15,095,282
<NET-ASSETS> 107,034
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,247
<OTHER-INCOME> 0
<EXPENSES-NET> 430
<NET-INVESTMENT-INCOME> 817
<REALIZED-GAINS-CURRENT> (575)
<APPREC-INCREASE-CURRENT> 7,514
<NET-CHANGE-FROM-OPS> 7,756
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 7,756
<ACCUMULATED-NII-PRIOR> 28,759
<ACCUMULATED-GAINS-PRIOR> (809,930)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 894,791
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,074,462
<AVERAGE-NET-ASSETS> 102,061
<PER-SHARE-NAV-BEGIN> 9.70
<PER-SHARE-NII> 0.08
<PER-SHARE-GAIN-APPREC> 0.68
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.46
<EXPENSE-RATIO> 0.85
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 64
<NAME> Small CAP Value Equity Fund, Class 4
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 333,465,381
<INVESTMENTS-AT-VALUE> 348,560,663
<RECEIVABLES> 3,067,594
<ASSETS-OTHER> 2,885
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 351,631,142
<PAYABLE-FOR-SECURITIES> 1,969,993
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 293,859
<TOTAL-LIABILITIES> 2,263,852
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 333,831,043
<SHARES-COMMON-STOCK> 33,352,127
<SHARES-COMMON-PRIOR> 32,058,197
<ACCUMULATED-NII-CURRENT> 3,051,714
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,610,749)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 15,095,282
<NET-ASSETS> 349,005,103
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4,014,240
<OTHER-INCOME> 0
<EXPENSES-NET> 993,105
<NET-INVESTMENT-INCOME> 3,021,135
<REALIZED-GAINS-CURRENT> (1,799,094)
<APPREC-INCREASE-CURRENT> 24,205,783
<NET-CHANGE-FROM-OPS> 25,427,824
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,368,039
<NUMBER-OF-SHARES-REDEEMED> 4,074,110
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 38,216,489
<ACCUMULATED-NII-PRIOR> 28,759
<ACCUMULATED-GAINS-PRIOR> (809,930)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 894,791
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,074,462
<AVERAGE-NET-ASSETS> 327,769,204
<PER-SHARE-NAV-BEGIN> 9.69
<PER-SHARE-NII> 0.09
<PER-SHARE-GAIN-APPREC> 0.68
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.46
<EXPENSE-RATIO> 0.61
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 41
<NAME> Balanced Fund, Class 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 365,936,133
<INVESTMENTS-AT-VALUE> 394,421,292
<RECEIVABLES> 3,043,671
<ASSETS-OTHER> 907,710
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 398,372,673
<PAYABLE-FOR-SECURITIES> 1,364,890
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 710,770
<TOTAL-LIABILITIES> 2,075,660
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 358,563,168
<SHARES-COMMON-STOCK> 13,949
<SHARES-COMMON-PRIOR> 10,056
<ACCUMULATED-NII-CURRENT> 8,015,376
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 956,308
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 28,762,161
<NET-ASSETS> 153,705
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,512
<OTHER-INCOME> 0
<EXPENSES-NET> 862
<NET-INVESTMENT-INCOME> 1,650
<REALIZED-GAINS-CURRENT> 346
<APPREC-INCREASE-CURRENT> 8,811
<NET-CHANGE-FROM-OPS> 10,807
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,893
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 53,715
<ACCUMULATED-NII-PRIOR> 30,533
<ACCUMULATED-GAINS-PRIOR> (283,084)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 837,836
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,036,671
<AVERAGE-NET-ASSETS> 105,493
<PER-SHARE-NAV-BEGIN> 9.94
<PER-SHARE-NII> 0.16
<PER-SHARE-GAIN-APPREC> 0.92
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.02
<EXPENSE-RATIO> 1.65
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 42
<NAME> Balanced Fund, Class 2
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 365,936,133
<INVESTMENTS-AT-VALUE> 394,421,292
<RECEIVABLES> 3,043,671
<ASSETS-OTHER> 907,710
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 398,372,673
<PAYABLE-FOR-SECURITIES> 1,364,890
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 710,770
<TOTAL-LIABILITIES> 2,075,660
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 358,563,168
<SHARES-COMMON-STOCK> 10,063
<SHARES-COMMON-PRIOR> 10,063
<ACCUMULATED-NII-CURRENT> 8,015,376
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 956,308
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 28,762,161
<NET-ASSETS> 111,202
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,518
<OTHER-INCOME> 0
<EXPENSES-NET> 575
<NET-INVESTMENT-INCOME> 1,943
<REALIZED-GAINS-CURRENT> 347
<APPREC-INCREASE-CURRENT> 8,831
<NET-CHANGE-FROM-OPS> 11,121
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 11,121
<ACCUMULATED-NII-PRIOR> 30,533
<ACCUMULATED-GAINS-PRIOR> (283,084)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 837,836
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,036,671
<AVERAGE-NET-ASSETS> 105,728
<PER-SHARE-NAV-BEGIN> 9.95
<PER-SHARE-NII> 0.19
<PER-SHARE-GAIN-APPREC> 0.91
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.05
<EXPENSE-RATIO> 1.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 43
<NAME> Balanced Fund, Class 3
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 365,936,133
<INVESTMENTS-AT-VALUE> 394,421,292
<RECEIVABLES> 3,043,671
<ASSETS-OTHER> 907,710
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 398,372,673
<PAYABLE-FOR-SECURITIES> 1,364,890
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 710,770
<TOTAL-LIABILITIES> 2,075,660
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 358,563,168
<SHARES-COMMON-STOCK> 10,040
<SHARES-COMMON-PRIOR> 10,040
<ACCUMULATED-NII-CURRENT> 8,015,376
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 956,308
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 28,762,161
<NET-ASSETS> 111,282
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,517
<OTHER-INCOME> 0
<EXPENSES-NET> 393
<NET-INVESTMENT-INCOME> 2,124
<REALIZED-GAINS-CURRENT> 348
<APPREC-INCREASE-CURRENT> 8,830
<NET-CHANGE-FROM-OPS> 11,302
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 11,302
<ACCUMULATED-NII-PRIOR> 30,533
<ACCUMULATED-GAINS-PRIOR> (283,084)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 837,836
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,036,671
<AVERAGE-NET-ASSETS> 105,713
<PER-SHARE-NAV-BEGIN> 9.96
<PER-SHARE-NII> 0.21
<PER-SHARE-GAIN-APPREC> 0.91
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.08
<EXPENSE-RATIO> 0.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 44
<NAME> Balanced Fund, Class 4
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 365,936,133
<INVESTMENTS-AT-VALUE> 394,421,292
<RECEIVABLES> 3,043,671
<ASSETS-OTHER> 907,710
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 398,372,673
<PAYABLE-FOR-SECURITIES> 1,364,890
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 710,770
<TOTAL-LIABILITIES> 2,075,660
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 358,563,168
<SHARES-COMMON-STOCK> 35,809,486
<SHARES-COMMON-PRIOR> 35,244,333
<ACCUMULATED-NII-CURRENT> 8,015,376
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 956,308
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 28,762,161
<NET-ASSETS> 395,920,824
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 8,931,593
<OTHER-INCOME> 0
<EXPENSES-NET> 952,466
<NET-INVESTMENT-INCOME> 7,979,127
<REALIZED-GAINS-CURRENT> 1,238,351
<APPREC-INCREASE-CURRENT> 31,250,443
<NET-CHANGE-FROM-OPS> 40,467,921
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10,374,643
<NUMBER-OF-SHARES-REDEEMED> 9,809,490
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 46,233,159
<ACCUMULATED-NII-PRIOR> 30,533
<ACCUMULATED-GAINS-PRIOR> (283,084)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 837,836
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,036,671
<AVERAGE-NET-ASSETS> 375,140,434
<PER-SHARE-NAV-BEGIN> 9.92
<PER-SHARE-NII> 0.22
<PER-SHARE-GAIN-APPREC> 0.92
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 11.06
<EXPENSE-RATIO> 0.51
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 71
<NAME> International Equity Fund, Class 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 169,847,659
<INVESTMENTS-AT-VALUE> 179,283,597
<RECEIVABLES> 5,907,536
<ASSETS-OTHER> 5,656,281
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 190,847,414
<PAYABLE-FOR-SECURITIES> 1,618,137
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 359,437
<TOTAL-LIABILITIES> 1,977,574
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 195,854,923
<SHARES-COMMON-STOCK> 11,473
<SHARES-COMMON-PRIOR> 10,005
<ACCUMULATED-NII-CURRENT> 1,446,293
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (17,831,448)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,400,072
<NET-ASSETS> 108,085
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,212
<OTHER-INCOME> 0
<EXPENSES-NET> 981
<NET-INVESTMENT-INCOME> 231
<REALIZED-GAINS-CURRENT> (8,543)
<APPREC-INCREASE-CURRENT> 10,044
<NET-CHANGE-FROM-OPS> 1,732
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,468
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 15,563
<ACCUMULATED-NII-PRIOR> 15,124
<ACCUMULATED-GAINS-PRIOR> (3,065,246)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 703,101
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 903,385
<AVERAGE-NET-ASSETS> 92,039
<PER-SHARE-NAV-BEGIN> 9.25
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.42
<EXPENSE-RATIO> 2.15
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 72
<NAME> International Equity Fund, Class 2
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 169,847,659
<INVESTMENTS-AT-VALUE> 179,283,597
<RECEIVABLES> 5,907,536
<ASSETS-OTHER> 5,656,281
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 190,847,414
<PAYABLE-FOR-SECURITIES> 1,618,137
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 359,437
<TOTAL-LIABILITIES> 1,977,574
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 195,854,923
<SHARES-COMMON-STOCK> 9,996
<SHARES-COMMON-PRIOR> 9,996
<ACCUMULATED-NII-CURRENT> 1,446,293
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (17,831,448)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,400,072
<NET-ASSETS> 94,598
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,215
<OTHER-INCOME> 0
<EXPENSES-NET> 731
<NET-INVESTMENT-INCOME> 484
<REALIZED-GAINS-CURRENT> (8,562)
<APPREC-INCREASE-CURRENT> 10,070
<NET-CHANGE-FROM-OPS> 1,992
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 1,992
<ACCUMULATED-NII-PRIOR> 15,124
<ACCUMULATED-GAINS-PRIOR> (3,065,246)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 703,101
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 903,385
<AVERAGE-NET-ASSETS> 92,248
<PER-SHARE-NAV-BEGIN> 9.26
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.46
<EXPENSE-RATIO> 1.60
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 73
<NAME> International Equity Fund, Class 3
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 169,847,659
<INVESTMENTS-AT-VALUE> 179,283,597
<RECEIVABLES> 5,907,536
<ASSETS-OTHER> 5,656,281
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 190,847,414
<PAYABLE-FOR-SECURITIES> 1,618,137
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 359,437
<TOTAL-LIABILITIES> 1,977,574
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 195,854,923
<SHARES-COMMON-STOCK> 9,980
<SHARES-COMMON-PRIOR> 9,980
<ACCUMULATED-NII-CURRENT> 1,446,293
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (17,831,448)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,400,072
<NET-ASSETS> 94,607
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,215
<OTHER-INCOME> 0
<EXPENSES-NET> 617
<NET-INVESTMENT-INCOME> 598
<REALIZED-GAINS-CURRENT> (8,425)
<APPREC-INCREASE-CURRENT> 9,934
<NET-CHANGE-FROM-OPS> 2,107
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 2,107
<ACCUMULATED-NII-PRIOR> 15,124
<ACCUMULATED-GAINS-PRIOR> (3,065,246)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 703,101
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 903,385
<AVERAGE-NET-ASSETS> 92,199
<PER-SHARE-NAV-BEGIN> 9.27
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.48
<EXPENSE-RATIO> 1.35
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 74
<NAME> International Equity Fund, Class 4
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 169,847,659
<INVESTMENTS-AT-VALUE> 179,283,597
<RECEIVABLES> 5,907,536
<ASSETS-OTHER> 5,656,281
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 190,847,414
<PAYABLE-FOR-SECURITIES> 1,618,137
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 359,437
<TOTAL-LIABILITIES> 1,977,574
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 195,854,923
<SHARES-COMMON-STOCK> 19,837,383
<SHARES-COMMON-PRIOR> 16,188,105
<ACCUMULATED-NII-CURRENT> 1,446,293
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (17,831,448)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,400,072
<NET-ASSETS> 188,572,550
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,257,314
<OTHER-INCOME> 0
<EXPENSES-NET> 827,459
<NET-INVESTMENT-INCOME> 1,429,855
<REALIZED-GAINS-CURRENT> (14,740,672)
<APPREC-INCREASE-CURRENT> 17,937,079
<NET-CHANGE-FROM-OPS> 4,626,262
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,711,983
<NUMBER-OF-SHARES-REDEEMED> 3,062,707
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 38,373,299
<ACCUMULATED-NII-PRIOR> 15,124
<ACCUMULATED-GAINS-PRIOR> (3,065,246)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 703,101
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 903,385
<AVERAGE-NET-ASSETS> 166,529,993
<PER-SHARE-NAV-BEGIN> 9.28
<PER-SHARE-NII> 0.07
<PER-SHARE-GAIN-APPREC> 0.16
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.51
<EXPENSE-RATIO> 1.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 21
<NAME> Short Term Bond Fund, Class 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 119,005,310
<INVESTMENTS-AT-VALUE> 120,110,074
<RECEIVABLES> 1,549,695
<ASSETS-OTHER> 3,248
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 121,663,017
<PAYABLE-FOR-SECURITIES> 220,857
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 62,248
<TOTAL-LIABILITIES> 283,105
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 114,367,353
<SHARES-COMMON-STOCK> 10,156
<SHARES-COMMON-PRIOR> 10,156
<ACCUMULATED-NII-CURRENT> 3,722,063
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,186,498
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,103,998
<NET-ASSETS> 107,921
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,750
<OTHER-INCOME> 0
<EXPENSES-NET> 853
<NET-INVESTMENT-INCOME> 2,897
<REALIZED-GAINS-CURRENT> 2,112
<APPREC-INCREASE-CURRENT> 2,452
<NET-CHANGE-FROM-OPS> 7,461
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 7,461
<ACCUMULATED-NII-PRIOR> 692
<ACCUMULATED-GAINS-PRIOR> (138,396)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 249,270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,130
<AVERAGE-NET-ASSETS> 104,373
<PER-SHARE-NAV-BEGIN> 9.89
<PER-SHARE-NII> 0.29
<PER-SHARE-GAIN-APPREC> 0.45
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.63
<EXPENSE-RATIO> 1.65
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 22
<NAME> Short Term Bond Fund, Class 2
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 119,005,310
<INVESTMENTS-AT-VALUE> 120,110,074
<RECEIVABLES> 1,549,695
<ASSETS-OTHER> 3,248
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 121,663,017
<PAYABLE-FOR-SECURITIES> 220,857
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 62,248
<TOTAL-LIABILITIES> 283,105
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 114,367,353
<SHARES-COMMON-STOCK> 10,164
<SHARES-COMMON-PRIOR> 10,164
<ACCUMULATED-NII-CURRENT> 3,722,063
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,186,498
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,103,998
<NET-ASSETS> 108,314
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,758
<OTHER-INCOME> 0
<EXPENSES-NET> 569
<NET-INVESTMENT-INCOME> 3,189
<REALIZED-GAINS-CURRENT> 2,119
<APPREC-INCREASE-CURRENT> 2,455
<NET-CHANGE-FROM-OPS> 7,763
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 7,763
<ACCUMULATED-NII-PRIOR> 692
<ACCUMULATED-GAINS-PRIOR> (138,396)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 249,270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,130
<AVERAGE-NET-ASSETS> 104,611
<PER-SHARE-NAV-BEGIN> 9.89
<PER-SHARE-NII> 0.31
<PER-SHARE-GAIN-APPREC> 0.46
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.66
<EXPENSE-RATIO> 1.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 23
<NAME> Short Term Bond Fund, Class 3
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 119,005,310
<INVESTMENTS-AT-VALUE> 120,110,074
<RECEIVABLES> 1,549,695
<ASSETS-OTHER> 3,248
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 121,663,017
<PAYABLE-FOR-SECURITIES> 220,857
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 62,248
<TOTAL-LIABILITIES> 283,105
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 114,367,353
<SHARES-COMMON-STOCK> 10,144
<SHARES-COMMON-PRIOR> 10,144
<ACCUMULATED-NII-CURRENT> 3,722,063
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,186,498
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,103,998
<NET-ASSETS> 108,437
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,759
<OTHER-INCOME> 0
<EXPENSES-NET> 389
<NET-INVESTMENT-INCOME> 3,370
<REALIZED-GAINS-CURRENT> 2,120
<APPREC-INCREASE-CURRENT> 2,455
<NET-CHANGE-FROM-OPS> 7,945
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 7,945
<ACCUMULATED-NII-PRIOR> 692
<ACCUMULATED-GAINS-PRIOR> (138,396)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 249,270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,130
<AVERAGE-NET-ASSETS> 104,639
<PER-SHARE-NAV-BEGIN> 9.91
<PER-SHARE-NII> 0.33
<PER-SHARE-GAIN-APPREC> 0.45
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.69
<EXPENSE-RATIO> 0.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc.
form N-SAR for the period ended June 30, 1995
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 24
<NAME> Short Term Bond Fund, Class 4
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 119,005,310
<INVESTMENTS-AT-VALUE> 120,110,074
<RECEIVABLES> 1,549,695
<ASSETS-OTHER> 3,248
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 121,663,017
<PAYABLE-FOR-SECURITIES> 220,857
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 62,248
<TOTAL-LIABILITIES> 283,105
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 114,367,353
<SHARES-COMMON-STOCK> 11,376,818
<SHARES-COMMON-PRIOR> 10,847,942
<ACCUMULATED-NII-CURRENT> 3,722,063
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,186,498
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,103,998
<NET-ASSETS> 121,055,240
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,998,601
<OTHER-INCOME> 0
<EXPENSES-NET> 286,685
<NET-INVESTMENT-INCOME> 3,711,916
<REALIZED-GAINS-CURRENT> 2,318,543
<APPREC-INCREASE-CURRENT> 2,549,903
<NET-CHANGE-FROM-OPS> 8,580,362
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,364,536
<NUMBER-OF-SHARES-REDEEMED> 2,835,659
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 14,209,330
<ACCUMULATED-NII-PRIOR> 692
<ACCUMULATED-GAINS-PRIOR> (138,396)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 249,270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,130
<AVERAGE-NET-ASSETS> 111,391,313
<PER-SHARE-NAV-BEGIN> 9.85
<PER-SHARE-NII> 0.33
<PER-SHARE-GAIN-APPREC> 0.46
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.64
<EXPENSE-RATIO> 0.52
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
