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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 9
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
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<PAGE> PAGE 18
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<PAGE> PAGE 20
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<PAGE> PAGE 21
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<PAGE> PAGE 22
008 A000502 CONCERT CAPITAL MANAGEMENT
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<PAGE> PAGE 23
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<PAGE> PAGE 24
069 000500 N
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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
008 D020601 MA
008 D030601 01111
008 A000602 CONCERT CAPITAL MANAGEMENT, INC.
008 B000602 S
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008 D030602 02142
015 A000601 INVESTORS BANK & TRUST COMPANY
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<PAGE> PAGE 27
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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 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B000701 A
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
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015 A000701 INVESTORS BANK & TRUST COMPANY
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015 A000702 CITIBANK
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015 A000703 CHASE MANHATTAN BANK
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015 A000704 NATIONAL AUSTRALIAN BANK
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015 A000705 EUROCLEAR
<PAGE> PAGE 31
015 B000705 S
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015 A000706 STANDARD CHARTERED BANK
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015 A000707 BANK OF BOSTON
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015 A000708 BANK OF IRELAND
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015 A000709 BANCOMER SA
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015 A000710 BARCLAYS BANK
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015 A000711 THE STANDARD BANK OF SOUTH AFRICA LTD
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015 D010711 SOUTH AFRICA
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024 000700 Y
025 A000701 NOMURA SECURITIES
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<PAGE> PAGE 32
025 A000703 STANDARD CHARTERED 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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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, 1996
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 31
<NAME> Core Bond Fund, Class 1
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<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (605,900)
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<INTEREST-INCOME> 4,682
<OTHER-INCOME> 0
<EXPENSES-NET> 1,137
<NET-INVESTMENT-INCOME> 3,545
<REALIZED-GAINS-CURRENT> (441)
<APPREC-INCREASE-CURRENT> (7,167)
<NET-CHANGE-FROM-OPS> (4,063)
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<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (50,685)
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<PER-SHARE-NAV-BEGIN> 10.79
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<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.51
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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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 310,881,332
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<SHARES-COMMON-PRIOR> 11,069
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<OVERDISTRIBUTION-GAINS> 0
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<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> (2,740)
<ACCUMULATED-NII-PRIOR> 114,829
<ACCUMULATED-GAINS-PRIOR> 1,944,986
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 623,646
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 768,233
<AVERAGE-NET-ASSETS> 117,229
<PER-SHARE-NAV-BEGIN> 10.82
<PER-SHARE-NII> 0.30
<PER-SHARE-GAIN-APPREC> (0.55)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.57
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 310,881,332
<INVESTMENTS-AT-VALUE> 310,180,411
<RECEIVABLES> 4,184,117
<ASSETS-OTHER> 97,868
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 314,462,396
<PAYABLE-FOR-SECURITIES> 5,225,204
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 462,435
<TOTAL-LIABILITIES> 5,687,639
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 300,524,463
<SHARES-COMMON-STOCK> 11,095
<SHARES-COMMON-PRIOR> 11,095
<ACCUMULATED-NII-CURRENT> 8,883,226
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (27,032)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (605,900)
<NET-ASSETS> 117,551
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,991
<OTHER-INCOME> 0
<EXPENSES-NET> 439
<NET-INVESTMENT-INCOME> 3,552
<REALIZED-GAINS-CURRENT> (681)
<APPREC-INCREASE-CURRENT> (5,421)
<NET-CHANGE-FROM-OPS> (2,550)
<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> (2,549)
<ACCUMULATED-NII-PRIOR> 114,829
<ACCUMULATED-GAINS-PRIOR> 1,944,986
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 623,646
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 768,233
<AVERAGE-NET-ASSETS> 117,700
<PER-SHARE-NAV-BEGIN> 10.82
<PER-SHARE-NII> 0.32
<PER-SHARE-GAIN-APPREC> (0.55)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.59
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 310,881,332
<INVESTMENTS-AT-VALUE> 310,180,411
<RECEIVABLES> 4,184,117
<ASSETS-OTHER> 97,868
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 314,462,396
<PAYABLE-FOR-SECURITIES> 5,225,204
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 462,435
<TOTAL-LIABILITIES> 5,687,639
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 300,524,463
<SHARES-COMMON-STOCK> 29,270,161
<SHARES-COMMON-PRIOR> 23,578,010
<ACCUMULATED-NII-CURRENT> 8,883,226
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (27,032)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (605,900)
<NET-ASSETS> 308,419,984
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 9,467,968
<OTHER-INCOME> 0
<EXPENSES-NET> 710,004
<NET-INVESTMENT-INCOME> 8,757,964
<REALIZED-GAINS-CURRENT> (1,970,218)
<APPREC-INCREASE-CURRENT> (11,753,115)
<NET-CHANGE-FROM-OPS> (4,965,369)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 9,060,480
<NUMBER-OF-SHARES-REDEEMED> 3,368,329
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 54,879,905
<ACCUMULATED-NII-PRIOR> 114,829
<ACCUMULATED-GAINS-PRIOR> 1,944,986
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 623,646
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 768,233
<AVERAGE-NET-ASSETS> 278,325,033
<PER-SHARE-NAV-BEGIN> 10.75
<PER-SHARE-NII> 0.30
<PER-SHARE-GAIN-APPREC> (0.51)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.54
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 1,734,674,211
<INVESTMENTS-AT-VALUE> 2,274,382,835
<RECEIVABLES> 10,903,516
<ASSETS-OTHER> 65,462
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,285,351,813
<PAYABLE-FOR-SECURITIES> 55,908
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,047,421
<TOTAL-LIABILITIES> 4,103,329
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,676,467,676
<SHARES-COMMON-STOCK> 10,237
<SHARES-COMMON-PRIOR> 10,237
<ACCUMULATED-NII-CURRENT> 27,643,607
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 37,428,577
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 539,708,624
<NET-ASSETS> 139,609
<DIVIDEND-INCOME> 1,971
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 1,114
<NET-INVESTMENT-INCOME> 857
<REALIZED-GAINS-CURRENT> 1,978
<APPREC-INCREASE-CURRENT> 7,507
<NET-CHANGE-FROM-OPS> 10,342
<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> 10,351
<ACCUMULATED-NII-PRIOR> 626,868
<ACCUMULATED-GAINS-PRIOR> 4,803,720
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,042,553
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6,195,260
<AVERAGE-NET-ASSETS> 135,872
<PER-SHARE-NAV-BEGIN> 12.63
<PER-SHARE-NII> 0.08
<PER-SHARE-GAIN-APPREC> 0.93
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.64
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 1,734,674,211
<INVESTMENTS-AT-VALUE> 2,274,382,835
<RECEIVABLES> 10,903,516
<ASSETS-OTHER> 65,462
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,285,351,813
<PAYABLE-FOR-SECURITIES> 55,908
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,047,421
<TOTAL-LIABILITIES> 4,103,329
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,676,467,676
<SHARES-COMMON-STOCK> 10,284
<SHARES-COMMON-PRIOR> 10,284
<ACCUMULATED-NII-CURRENT> 27,643,607
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 37,428,577
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 539,708,624
<NET-ASSETS> 140,886
<DIVIDEND-INCOME> 1,986
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 747
<NET-INVESTMENT-INCOME> 1,239
<REALIZED-GAINS-CURRENT> 1,994
<APPREC-INCREASE-CURRENT> 7,561
<NET-CHANGE-FROM-OPS> 10,794
<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> 10,798
<ACCUMULATED-NII-PRIOR> 626,868
<ACCUMULATED-GAINS-PRIOR> 4,803,720
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,042,553
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6,195,260
<AVERAGE-NET-ASSETS> 136,932
<PER-SHARE-NAV-BEGIN> 12.65
<PER-SHARE-NII> 0.12
<PER-SHARE-GAIN-APPREC> 0.93
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.70
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 1,734,674,211
<INVESTMENTS-AT-VALUE> 2,274,382,835
<RECEIVABLES> 10,903,516
<ASSETS-OTHER> 65,462
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,285,351,813
<PAYABLE-FOR-SECURITIES> 55,908
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,047,421
<TOTAL-LIABILITIES> 4,103,329
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,676,467,676
<SHARES-COMMON-STOCK> 10,301
<SHARES-COMMON-PRIOR> 10,301
<ACCUMULATED-NII-CURRENT> 27,643,607
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 37,428,577
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 539,708,624
<NET-ASSETS> 141,457
<DIVIDEND-INCOME> 1,992
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 512
<NET-INVESTMENT-INCOME> 1,480
<REALIZED-GAINS-CURRENT> 2,001
<APPREC-INCREASE-CURRENT> 7,582
<NET-CHANGE-FROM-OPS> 11,063
<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> 11,066
<ACCUMULATED-NII-PRIOR> 626,868
<ACCUMULATED-GAINS-PRIOR> 4,803,720
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,042,553
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6,195,260
<AVERAGE-NET-ASSETS> 137,371
<PER-SHARE-NAV-BEGIN> 12.66
<PER-SHARE-NII> 0.14
<PER-SHARE-GAIN-APPREC> 0.93
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.73
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 1,734,674,211
<INVESTMENTS-AT-VALUE> 2,274,382,835
<RECEIVABLES> 10,903,516
<ASSETS-OTHER> 65,462
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,285,351,813
<PAYABLE-FOR-SECURITIES> 55,908
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,047,421
<TOTAL-LIABILITIES> 4,103,329
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,676,467,676
<SHARES-COMMON-STOCK> 166,228,937
<SHARES-COMMON-PRIOR> 168,233,242
<ACCUMULATED-NII-CURRENT> 27,643,607
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 37,428,577
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 539,708,624
<NET-ASSETS> 2,280,826,532
<DIVIDEND-INCOME> 32,690,044
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 5,676,881
<NET-INVESTMENT-INCOME> 27,013,163
<REALIZED-GAINS-CURRENT> 32,618,884
<APPREC-INCREASE-CURRENT> 124,282,814
<NET-CHANGE-FROM-OPS> 183,914,861
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 23,143,496
<NUMBER-OF-SHARES-REDEEMED> 25,147,801
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 155,578,127
<ACCUMULATED-NII-PRIOR> 626,868
<ACCUMULATED-GAINS-PRIOR> 4,803,720
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,042,553
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6,195,260
<AVERAGE-NET-ASSETS> 2,253,038,317
<PER-SHARE-NAV-BEGIN> 12.63
<PER-SHARE-NII> 0.16
<PER-SHARE-GAIN-APPREC> 0.93
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.72
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 272,920,522
<INVESTMENTS-AT-VALUE> 272,915,114
<RECEIVABLES> 348,354
<ASSETS-OTHER> 4,513
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 273,267,981
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,092,177
<TOTAL-LIABILITIES> 1,092,177
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 265,302,652
<SHARES-COMMON-STOCK> 698
<SHARES-COMMON-PRIOR> 698
<ACCUMULATED-NII-CURRENT> 6,882,396
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (3,836)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (5,408)
<NET-ASSETS> 107,555
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,961
<OTHER-INCOME> 0
<EXPENSES-NET> 873
<NET-INVESTMENT-INCOME> 2,088
<REALIZED-GAINS-CURRENT> (1)
<APPREC-INCREASE-CURRENT> 13
<NET-CHANGE-FROM-OPS> 2,100
<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> 132,953
<ACCUMULATED-GAINS-PRIOR> (2,083)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 598,502
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 730,083
<AVERAGE-NET-ASSETS> 106,556
<PER-SHARE-NAV-BEGIN> 151.05
<PER-SHARE-NII> 2.99
<PER-SHARE-GAIN-APPREC> 0.03
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 154.07
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 272,920,522
<INVESTMENTS-AT-VALUE> 272,915,114
<RECEIVABLES> 348,354
<ASSETS-OTHER> 4,513
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 273,267,981
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,092,177
<TOTAL-LIABILITIES> 1,092,177
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 265,302,652
<SHARES-COMMON-STOCK> 702
<SHARES-COMMON-PRIOR> 702
<ACCUMULATED-NII-CURRENT> 6,882,396
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (3,836)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (5,408)
<NET-ASSETS> 108,540
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,984
<OTHER-INCOME> 0
<EXPENSES-NET> 586
<NET-INVESTMENT-INCOME> 2,398
<REALIZED-GAINS-CURRENT> (1)
<APPREC-INCREASE-CURRENT> 13
<NET-CHANGE-FROM-OPS> 2,410
<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> 2,414
<ACCUMULATED-NII-PRIOR> 132,953
<ACCUMULATED-GAINS-PRIOR> (2,083)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 598,502
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 730,083
<AVERAGE-NET-ASSETS> 107,387
<PER-SHARE-NAV-BEGIN> 151.24
<PER-SHARE-NII> 3.42
<PER-SHARE-GAIN-APPREC> 0.02
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 154.68
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 272,920,522
<INVESTMENTS-AT-VALUE> 272,915,114
<RECEIVABLES> 348,354
<ASSETS-OTHER> 4,513
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 273,267,981
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,092,177
<TOTAL-LIABILITIES> 1,092,177
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 265,302,652
<SHARES-COMMON-STOCK> 703
<SHARES-COMMON-PRIOR> 703
<ACCUMULATED-NII-CURRENT> 6,882,396
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (3,836)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (5,408)
<NET-ASSETS> 108,988
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,993
<OTHER-INCOME> 0
<EXPENSES-NET> 401
<NET-INVESTMENT-INCOME> 2,592
<REALIZED-GAINS-CURRENT> (1)
<APPREC-INCREASE-CURRENT> 13
<NET-CHANGE-FROM-OPS> 2,604
<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> 2,606
<ACCUMULATED-NII-PRIOR> 132,953
<ACCUMULATED-GAINS-PRIOR> (2,083)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 598,502
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 730,083
<AVERAGE-NET-ASSETS> 107,739
<PER-SHARE-NAV-BEGIN> 151.32
<PER-SHARE-NII> 3.69
<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> 155.02
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 272,920,522
<INVESTMENTS-AT-VALUE> 272,915,114
<RECEIVABLES> 348,354
<ASSETS-OTHER> 4,513
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 273,267,981
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,092,177
<TOTAL-LIABILITIES> 1,092,177
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 265,302,652
<SHARES-COMMON-STOCK> 1,754,610
<SHARES-COMMON-PRIOR> 1,681,065
<ACCUMULATED-NII-CURRENT> 6,882,396
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (3,836)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (5,408)
<NET-ASSETS> 271,850,721
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7,427,822
<OTHER-INCOME> 0
<EXPENSES-NET> 685,457
<NET-INVESTMENT-INCOME> 6,742,365
<REALIZED-GAINS-CURRENT> (1,751)
<APPREC-INCREASE-CURRENT> 14,090
<NET-CHANGE-FROM-OPS> 6,754,704
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,405,346
<NUMBER-OF-SHARES-REDEEMED> 1,331,801
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 17,914,570
<ACCUMULATED-NII-PRIOR> 132,953
<ACCUMULATED-GAINS-PRIOR> (2,083)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 598,502
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 730,083
<AVERAGE-NET-ASSETS> 267,140,876
<PER-SHARE-NAV-BEGIN> 151.06
<PER-SHARE-NII> 3.84
<PER-SHARE-GAIN-APPREC> 0.04
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 154.94
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 351,338,028
<INVESTMENTS-AT-VALUE> 426,350,883
<RECEIVABLES> 1,039,306
<ASSETS-OTHER> 4,555
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 427,394,744
<PAYABLE-FOR-SECURITIES> 713,616
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,924,901
<TOTAL-LIABILITIES> 2,638,517
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 339,620,073
<SHARES-COMMON-STOCK> 13,919
<SHARES-COMMON-PRIOR> 15,094
<ACCUMULATED-NII-CURRENT> 7,071,958
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,051,341
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 75,012,855
<NET-ASSETS> 172,737
<DIVIDEND-INCOME> 3,441
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 1,320
<NET-INVESTMENT-INCOME> 2,121
<REALIZED-GAINS-CURRENT> 1,431
<APPREC-INCREASE-CURRENT> 7,518
<NET-CHANGE-FROM-OPS> 11,070
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,347
<NUMBER-OF-SHARES-REDEEMED> 5,522
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 692
<ACCUMULATED-NII-PRIOR> 99,330
<ACCUMULATED-GAINS-PRIOR> (33,140)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,100,514
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,310,625
<AVERAGE-NET-ASSETS> 151,965
<PER-SHARE-NAV-BEGIN> 11.40
<PER-SHARE-NII> 0.15
<PER-SHARE-GAIN-APPREC> 0.86
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.41
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 351,338,028
<INVESTMENTS-AT-VALUE> 426,350,883
<RECEIVABLES> 1,039,306
<ASSETS-OTHER> 4,555
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 427,394,744
<PAYABLE-FOR-SECURITIES> 713,616
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,924,901
<TOTAL-LIABILITIES> 2,638,517
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 339,620,073
<SHARES-COMMON-STOCK> 10,347
<SHARES-COMMON-PRIOR> 10,347
<ACCUMULATED-NII-CURRENT> 7,071,958
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,051,341
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 75,012,855
<NET-ASSETS> 129,209
<DIVIDEND-INCOME> 2,508
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 733
<NET-INVESTMENT-INCOME> 1,775
<REALIZED-GAINS-CURRENT> 939
<APPREC-INCREASE-CURRENT> 8,151
<NET-CHANGE-FROM-OPS> 10,866
<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> 10,870
<ACCUMULATED-NII-PRIOR> 99,330
<ACCUMULATED-GAINS-PRIOR> (33,140)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,100,514
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,310,625
<AVERAGE-NET-ASSETS> 123,076
<PER-SHARE-NAV-BEGIN> 11.44
<PER-SHARE-NII> 0.17
<PER-SHARE-GAIN-APPREC> 0.88
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.49
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 351,338,028
<INVESTMENTS-AT-VALUE> 426,350,883
<RECEIVABLES> 1,039,306
<ASSETS-OTHER> 4,555
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 427,394,744
<PAYABLE-FOR-SECURITIES> 713,616
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,924,901
<TOTAL-LIABILITIES> 2,638,517
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 339,620,073
<SHARES-COMMON-STOCK> 10,382
<SHARES-COMMON-PRIOR> 10,382
<ACCUMULATED-NII-CURRENT> 7,071,958
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,051,341
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 75,012,855
<NET-ASSETS> 129,930
<DIVIDEND-INCOME> 2,520
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 523
<NET-INVESTMENT-INCOME> 1,997
<REALIZED-GAINS-CURRENT> 943
<APPREC-INCREASE-CURRENT> 8,191
<NET-CHANGE-FROM-OPS> 11,132
<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> 11,133
<ACCUMULATED-NII-PRIOR> 99,330
<ACCUMULATED-GAINS-PRIOR> (33,140)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,100,514
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,310,625
<AVERAGE-NET-ASSETS> 123,661
<PER-SHARE-NAV-BEGIN> 11.44
<PER-SHARE-NII> 0.19
<PER-SHARE-GAIN-APPREC> 0.88
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.51
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 351,338,028
<INVESTMENTS-AT-VALUE> 426,350,883
<RECEIVABLES> 1,039,306
<ASSETS-OTHER> 4,555
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 427,394,744
<PAYABLE-FOR-SECURITIES> 713,616
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,924,901
<TOTAL-LIABILITIES> 2,638,517
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 339,620,073
<SHARES-COMMON-STOCK> 33,875,016
<SHARES-COMMON-PRIOR> 33,253,093
<ACCUMULATED-NII-CURRENT> 7,071,958
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,051,341
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 75,012,855
<NET-ASSETS> 424,324,351
<DIVIDEND-INCOME> 8,188,095
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 1,221,360
<NET-INVESTMENT-INCOME> 6,966,735
<REALIZED-GAINS-CURRENT> 3,081,168
<APPREC-INCREASE-CURRENT> 26,730,521
<NET-CHANGE-FROM-OPS> 36,778,423
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,455,096
<NUMBER-OF-SHARES-REDEEMED> 4,833,173
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 43,926,003
<ACCUMULATED-NII-PRIOR> 99,330
<ACCUMULATED-GAINS-PRIOR> (33,140)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,100,514
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,310,625
<AVERAGE-NET-ASSETS> 401,986,984
<PER-SHARE-NAV-BEGIN> 11.44
<PER-SHARE-NII> 0.21
<PER-SHARE-GAIN-APPREC> 0.88
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.53
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 443,089,217
<INVESTMENTS-AT-VALUE> 506,960,633
<RECEIVABLES> 3,077,263
<ASSETS-OTHER> 8,961
<OTHER-ITEMS-ASSETS> 1,419
<TOTAL-ASSETS> 510,048,276
<PAYABLE-FOR-SECURITIES> 1,573,773
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,013,670
<TOTAL-LIABILITIES> 2,587,443
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 429,036,468
<SHARES-COMMON-STOCK> 10,706
<SHARES-COMMON-PRIOR> 15,043
<ACCUMULATED-NII-CURRENT> 9,468,853
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,082,677
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 63,872,835
<NET-ASSETS> 128,795
<DIVIDEND-INCOME> 3,201
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 1,212
<NET-INVESTMENT-INCOME> 1,989
<REALIZED-GAINS-CURRENT> 1,187
<APPREC-INCREASE-CURRENT> 3,672
<NET-CHANGE-FROM-OPS> 6,848
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 906
<NUMBER-OF-SHARES-REDEEMED> 5,243
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (44,248)
<ACCUMULATED-NII-PRIOR> 179,574
<ACCUMULATED-GAINS-PRIOR> 877,322
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,094,353
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,341,990
<AVERAGE-NET-ASSETS> 148,045
<PER-SHARE-NAV-BEGIN> 11.50
<PER-SHARE-NII> 0.16
<PER-SHARE-GAIN-APPREC> 0.37
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.03
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 443,089,217
<INVESTMENTS-AT-VALUE> 506,960,633
<RECEIVABLES> 3,077,263
<ASSETS-OTHER> 8,961
<OTHER-ITEMS-ASSETS> 1,419
<TOTAL-ASSETS> 510,048,276
<PAYABLE-FOR-SECURITIES> 1,573,773
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,013,670
<TOTAL-LIABILITIES> 2,587,443
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 429,036,468
<SHARES-COMMON-STOCK> 10,464
<SHARES-COMMON-PRIOR> 10,464
<ACCUMULATED-NII-CURRENT> 9,468,853
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,082,677
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 63,872,835
<NET-ASSETS> 126,539
<DIVIDEND-INCOME> 2,674
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 678
<NET-INVESTMENT-INCOME> 1,996
<REALIZED-GAINS-CURRENT> 1,061
<APPREC-INCREASE-CURRENT> 2,827
<NET-CHANGE-FROM-OPS> 5,884
<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> 5,871
<ACCUMULATED-NII-PRIOR> 179,574
<ACCUMULATED-GAINS-PRIOR> 877,322
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,094,353
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,341,990
<AVERAGE-NET-ASSETS> 124,168
<PER-SHARE-NAV-BEGIN> 11.53
<PER-SHARE-NII> 0.19
<PER-SHARE-GAIN-APPREC> 0.37
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.09
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 443,089,217
<INVESTMENTS-AT-VALUE> 506,960,633
<RECEIVABLES> 3,077,263
<ASSETS-OTHER> 8,961
<OTHER-ITEMS-ASSETS> 1,419
<TOTAL-ASSETS> 510,048,276
<PAYABLE-FOR-SECURITIES> 1,573,773
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,013,670
<TOTAL-LIABILITIES> 2,587,443
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 429,036,468
<SHARES-COMMON-STOCK> 10,473
<SHARES-COMMON-PRIOR> 10,473
<ACCUMULATED-NII-CURRENT> 9,468,853
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,082,677
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 63,872,835
<NET-ASSETS> 127,063
<DIVIDEND-INCOME> 2,683
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 465
<NET-INVESTMENT-INCOME> 2,218
<REALIZED-GAINS-CURRENT> 1,065
<APPREC-INCREASE-CURRENT> 2,835
<NET-CHANGE-FROM-OPS> 6,118
<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> 6,103
<ACCUMULATED-NII-PRIOR> 179,574
<ACCUMULATED-GAINS-PRIOR> 877,322
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,094,353
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,341,990
<AVERAGE-NET-ASSETS> 124,576
<PER-SHARE-NAV-BEGIN> 11.55
<PER-SHARE-NII> 0.21
<PER-SHARE-GAIN-APPREC> 0.37
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.13
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 443,089,217
<INVESTMENTS-AT-VALUE> 506,960,633
<RECEIVABLES> 3,077,263
<ASSETS-OTHER> 8,961
<OTHER-ITEMS-ASSETS> 1,419
<TOTAL-ASSETS> 510,048,276
<PAYABLE-FOR-SECURITIES> 1,573,773
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,013,670
<TOTAL-LIABILITIES> 2,587,443
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 429,036,468
<SHARES-COMMON-STOCK> 41,890,565
<SHARES-COMMON-PRIOR> 39,690,301
<ACCUMULATED-NII-CURRENT> 9,468,853
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,082,677
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 63,872,835
<NET-ASSETS> 507,078,436
<DIVIDEND-INCOME> 10,527,197
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 1,244,121
<NET-INVESTMENT-INCOME> 9,283,076
<REALIZED-GAINS-CURRENT> 4,202,042
<APPREC-INCREASE-CURRENT> 10,879,398
<NET-CHANGE-FROM-OPS> 24,364,516
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8,726,225
<NUMBER-OF-SHARES-REDEEMED> 6,525,961
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 50,305,576
<ACCUMULATED-NII-PRIOR> 179,574
<ACCUMULATED-GAINS-PRIOR> 877,322
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,094,353
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,341,990
<AVERAGE-NET-ASSETS> 488,654,656
<PER-SHARE-NAV-BEGIN> 11.51
<PER-SHARE-NII> 0.22
<PER-SHARE-GAIN-APPREC> 0.37
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.10
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 266,345,243
<INVESTMENTS-AT-VALUE> 293,107,407
<RECEIVABLES> 3,879,086
<ASSETS-OTHER> 4,275,272
<OTHER-ITEMS-ASSETS> 619,684
<TOTAL-ASSETS> 301,881,449
<PAYABLE-FOR-SECURITIES> 12,778,201
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,872,867
<TOTAL-LIABILITIES> 14,651,068
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 269,293,151
<SHARES-COMMON-STOCK> 14,264
<SHARES-COMMON-PRIOR> 11,708
<ACCUMULATED-NII-CURRENT> 1,155,017
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,604,109)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 27,386,322
<NET-ASSETS> 148,769
<DIVIDEND-INCOME> 1,142
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 1,222
<NET-INVESTMENT-INCOME> (80)
<REALIZED-GAINS-CURRENT> 3,125
<APPREC-INCREASE-CURRENT> 5,579
<NET-CHANGE-FROM-OPS> 8,624
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,370
<NUMBER-OF-SHARES-REDEEMED> 2,814
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 37,126
<ACCUMULATED-NII-PRIOR> (215,389)
<ACCUMULATED-GAINS-PRIOR> (17,063,339)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,064,419
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,736
<AVERAGE-NET-ASSETS> 114,279
<PER-SHARE-NAV-BEGIN> 9.54
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.89
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.43
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 266,345,243
<INVESTMENTS-AT-VALUE> 293,107,407
<RECEIVABLES> 3,879,086
<ASSETS-OTHER> 4,275,272
<OTHER-ITEMS-ASSETS> 619,684
<TOTAL-ASSETS> 301,881,449
<PAYABLE-FOR-SECURITIES> 12,778,201
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,872,867
<TOTAL-LIABILITIES> 14,651,068
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 269,293,151
<SHARES-COMMON-STOCK> 10,120
<SHARES-COMMON-PRIOR> 10,120
<ACCUMULATED-NII-CURRENT> 1,155,017
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,604,109)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 27,386,322
<NET-ASSETS> 106,126
<DIVIDEND-INCOME> 1,035
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 806
<NET-INVESTMENT-INCOME> 229
<REALIZED-GAINS-CURRENT> 2,686
<APPREC-INCREASE-CURRENT> 6,489
<NET-CHANGE-FROM-OPS> 9,404
<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> 9,357
<ACCUMULATED-NII-PRIOR> (215,389)
<ACCUMULATED-GAINS-PRIOR> (17,063,339)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,064,419
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,736
<AVERAGE-NET-ASSETS> 101,424
<PER-SHARE-NAV-BEGIN> 9.56
<PER-SHARE-NII> 0.02
<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> 10.49
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 266,345,243
<INVESTMENTS-AT-VALUE> 293,107,407
<RECEIVABLES> 3,879,086
<ASSETS-OTHER> 4,275,272
<OTHER-ITEMS-ASSETS> 619,684
<TOTAL-ASSETS> 301,881,449
<PAYABLE-FOR-SECURITIES> 12,778,201
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,872,867
<TOTAL-LIABILITIES> 14,651,068
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 269,293,151
<SHARES-COMMON-STOCK> 10,129
<SHARES-COMMON-PRIOR> 10,129
<ACCUMULATED-NII-CURRENT> 1,155,017
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,604,109)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 27,386,322
<NET-ASSETS> 106,408
<DIVIDEND-INCOME> 1,038
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 681
<NET-INVESTMENT-INCOME> 357
<REALIZED-GAINS-CURRENT> 2,691
<APPREC-INCREASE-CURRENT> 5,799
<NET-CHANGE-FROM-OPS> 8,847
<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> 9,500
<ACCUMULATED-NII-PRIOR> (215,389)
<ACCUMULATED-GAINS-PRIOR> (17,063,339)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,064,419
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,736
<AVERAGE-NET-ASSETS> 101,632
<PER-SHARE-NAV-BEGIN> 9.57
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 0.90
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.51
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 266,345,243
<INVESTMENTS-AT-VALUE> 293,107,407
<RECEIVABLES> 3,879,086
<ASSETS-OTHER> 4,275,272
<OTHER-ITEMS-ASSETS> 619,684
<TOTAL-ASSETS> 301,881,449
<PAYABLE-FOR-SECURITIES> 12,778,201
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,872,867
<TOTAL-LIABILITIES> 14,651,068
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 269,293,151
<SHARES-COMMON-STOCK> 27,230,156
<SHARES-COMMON-PRIOR> 23,044,249
<ACCUMULATED-NII-CURRENT> 1,155,017
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,604,109)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 27,386,322
<NET-ASSETS> 286,869,078
<DIVIDEND-INCOME> 2,623,107
<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 1,253,207
<NET-INVESTMENT-INCOME> 1,369,900
<REALIZED-GAINS-CURRENT> 6,450,728
<APPREC-INCREASE-CURRENT> 15,996,393
<NET-CHANGE-FROM-OPS> 23,817,021
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7,537,078
<NUMBER-OF-SHARES-REDEEMED> 3,351,171
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 66,150,810
<ACCUMULATED-NII-PRIOR> (215,389)
<ACCUMULATED-GAINS-PRIOR> (17,063,339)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,064,419
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,736
<AVERAGE-NET-ASSETS> 251,510,296
<PER-SHARE-NAV-BEGIN> 9.58
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.90
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.53
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 132,374,680
<INVESTMENTS-AT-VALUE> 132,346,688
<RECEIVABLES> 1,737,753
<ASSETS-OTHER> 4,892
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134,089,333
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 186,351
<TOTAL-LIABILITIES> 186,351
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 130,097,644
<SHARES-COMMON-STOCK> 10,896
<SHARES-COMMON-PRIOR> 10,896
<ACCUMULATED-NII-CURRENT> 3,735,716
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 97,614
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (27,992)
<NET-ASSETS> 112,357
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,494
<OTHER-INCOME> 0
<EXPENSES-NET> 913
<NET-INVESTMENT-INCOME> 2,581
<REALIZED-GAINS-CURRENT> 23
<APPREC-INCREASE-CURRENT> (1,243)
<NET-CHANGE-FROM-OPS> 1,361
<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> 1,368
<ACCUMULATED-NII-PRIOR> 68,862
<ACCUMULATED-GAINS-PRIOR> 71,465
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 285,214
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 353,277
<AVERAGE-NET-ASSETS> 111,488
<PER-SHARE-NAV-BEGIN> 10.19
<PER-SHARE-NII> 0.24
<PER-SHARE-GAIN-APPREC> (0.12)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.31
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 132,374,680
<INVESTMENTS-AT-VALUE> 132,346,688
<RECEIVABLES> 1,737,753
<ASSETS-OTHER> 4,892
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134,089,333
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 186,351
<TOTAL-LIABILITIES> 186,351
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 130,097,644
<SHARES-COMMON-STOCK> 10,960
<SHARES-COMMON-PRIOR> 10,960
<ACCUMULATED-NII-CURRENT> 3,735,716
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 97,614
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (27,992)
<NET-ASSETS> 113,385
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,522
<OTHER-INCOME> 0
<EXPENSES-NET> 613
<NET-INVESTMENT-INCOME> 2,909
<REALIZED-GAINS-CURRENT> 23
<APPREC-INCREASE-CURRENT> (1,252)
<NET-CHANGE-FROM-OPS> 1,680
<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> 1,683
<ACCUMULATED-NII-PRIOR> 68,862
<ACCUMULATED-GAINS-PRIOR> 71,465
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 285,214
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 353,277
<AVERAGE-NET-ASSETS> 112,357
<PER-SHARE-NAV-BEGIN> 10.19
<PER-SHARE-NII> 0.27
<PER-SHARE-GAIN-APPREC> (0.11)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.35
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 132,374,680
<INVESTMENTS-AT-VALUE> 132,346,688
<RECEIVABLES> 1,737,753
<ASSETS-OTHER> 4,892
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134,089,333
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 186,351
<TOTAL-LIABILITIES> 186,351
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 130,097,644
<SHARES-COMMON-STOCK> 10,974
<SHARES-COMMON-PRIOR> 10,974
<ACCUMULATED-NII-CURRENT> 3,735,716
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 97,614
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (27,992)
<NET-ASSETS> 113,909
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,535
<OTHER-INCOME> 0
<EXPENSES-NET> 420
<NET-INVESTMENT-INCOME> 3,115
<REALIZED-GAINS-CURRENT> 23
<APPREC-INCREASE-CURRENT> (1,257)
<NET-CHANGE-FROM-OPS> 1,881
<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> 1,882
<ACCUMULATED-NII-PRIOR> 68,862
<ACCUMULATED-GAINS-PRIOR> 71,465
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 285,214
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 353,277
<AVERAGE-NET-ASSETS> 112,780
<PER-SHARE-NAV-BEGIN> 10.21
<PER-SHARE-NII> 0.28
<PER-SHARE-GAIN-APPREC> (0.11)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.38
<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, 1996
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-31-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 132,374,680
<INVESTMENTS-AT-VALUE> 132,346,688
<RECEIVABLES> 1,737,753
<ASSETS-OTHER> 4,892
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134,089,333
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 186,351
<TOTAL-LIABILITIES> 186,351
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 130,097,644
<SHARES-COMMON-STOCK> 12,932,033
<SHARES-COMMON-PRIOR> 12,113,356
<ACCUMULATED-NII-CURRENT> 3,735,716
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 97,614
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (27,992)
<NET-ASSETS> 133,563,331
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,986,327
<OTHER-INCOME> 0
<EXPENSES-NET> 328,078
<NET-INVESTMENT-INCOME> 3,658,249
<REALIZED-GAINS-CURRENT> 26,080
<APPREC-INCREASE-CURRENT> (1,426,671)
<NET-CHANGE-FROM-OPS> 2,257,658
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,577,832
<NUMBER-OF-SHARES-REDEEMED> 2,759,155
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 10,659,175
<ACCUMULATED-NII-PRIOR> 68,862
<ACCUMULATED-GAINS-PRIOR> 71,465
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 285,214
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 353,277
<AVERAGE-NET-ASSETS> 127,121,579
<PER-SHARE-NAV-BEGIN> 10.15
<PER-SHARE-NII> 0.28
<PER-SHARE-GAIN-APPREC> (0.10)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.33
<EXPENSE-RATIO> 0.52
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0.00
</TABLE>
