MASSMUTUAL INSTITUTIONAL FUNDS
NSAR-B, 1997-02-27
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<PAGE>      PAGE  1
000 B000000 12/31/96
000 C000000 0000916053
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 MASSMUTUAL INSTITUTIONAL FUNDS
001 B000000 811-8274
001 C000000 4137888411
002 A000000 1295 STATE STREET
002 B000000 SPRINGFIELD
002 C000000 MA
002 D010000 01111
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  7
007 C010100  1
007 C020100 MASSMUTUAL PRIME FUND
007 C030100 N
007 C010200  2
007 C020200 MASSMUTUAL SHORT-TERM BOND FUND
007 C030200 N
007 C010300  3
007 C020300 MASSMUTUAL CORE BOND FUND
007 C030300 N
007 C010400  4
007 C020400 MASSMUTUAL BALANCED FUND
007 C030400 N
007 C010500  5
007 C020500 MASSMUTUAL VALUE EQUITY FUND
007 C030500 N
007 C010600  6
007 C020600 MASSMUTUAL SMALL CAP VALUE EQUITY FUND
007 C030600 N
007 C010700  7
007 C020700 MASSMUTUAL INTERNATIONAL EQUITY FUND
007 C030700 N
007 C010800  8
007 C010900  9
007 C011000 10
010 A00AA01 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
010 B00AA01 801-8059
010 C01AA01 SPRINGFIELD`
010 C02AA01 MA
010 C03AA01 01111
<PAGE>      PAGE  2
011 A00AA01 OPPENHEIMERFUNDS DISTRIBUTOR, INC
011 B00AA01 8-22992
011 C01AA01 NEW YORK
011 C02AA01 NY
011 C03AA01 10048
011 A00AA02 MML INVESTORS SERVICES, INC.
011 B00AA02 8-27250
011 C01AA02 SPRINGFIELD
011 C02AA02 MA
011 C03AA02 01111
012 A00AA01 INVESTORS BANK & TRUST COMPANY
012 B00AA01 85-720
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02111
013 A00AA01 COOPERS & LYBRAND LLP
013 B01AA01 SPRINGFIELD
013 B02AA01 MA
013 B03AA01 01101
013 B04AA01 0059
014 A00AA01 MML INVESTORS SERVICES, INC.
014 B00AA01 8-27250
014 A00AA02 OPPENHEIMERFUNDS DISTRIBUTOR, INC
014 B00AA02 8-22992
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   31
019 C00AA00 MASSMUTUAL
020 A000001 CREDIT SUISSE FIRST BOSTON CORPORATION
020 B000001 13-5659485
020 C000001    193
020 A000002 GOLDMAN SACHS & CO.
020 B000002 13-5108880
020 C000002    172
020 A000003 B. Z. W. SECURITIES
020 C000003    157
020 A000004 LEWCO SECURITIES (SCHRODER WERTHEIM)
020 B000004 13-2697272
020 C000004    121
020 A000005 MORGAN STANLEY & CO. INC.
020 B000005 13-2655998
020 C000005    112
020 A000006 PERSHING DIVISION OF DLJ
020 B000006 13-2741729
020 C000006     94
020 A000007 BROADCORT CAPITAL CORPORATION (MLPF & S)
020 C000007     74
020 A000008 JONES & ASSOCIATES, INCORPORATED
020 B000008 95-3583143
020 C000008     70
020 A000009 ROBERT W. BAIRD & CO. INC.
<PAGE>      PAGE  3
020 C000009     58
020 A000010 PRUDENTIAL SECURITIES INCORPORATED
020 B000010 22-2347336
020 C000010     58
021  000000     2584
022 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH, INC.
022 B000001 13-5674085
022 C000001   2296893
022 D000001     98236
022 A000002 GOLDMAN SACHS & CO.
022 B000002 13-5108880
022 C000002   1302801
022 D000002     65544
022 A000003 MASSMUTUAL (DIRECT)
022 B000003 04-1590850
022 C000003   1227488
022 D000003       245
022 A000004 MORGAN (J. P.), SECURITIES, INC.
022 B000004 13-3224016
022 C000004    892908
022 D000004     96616
022 A000005 LEHMAN BROTHERS
022 B000005 13-2518466
022 C000005    782966
022 D000005     47170
022 A000006 BA INVESTMENT SERVICES, INC.
022 B000006 95-3783486
022 C000006    561698
022 D000006     14983
022 A000007 CREDIT SUISSE FIRST BOSTON CORPORATION
022 B000007 13-5659485
022 C000007    490028
022 D000007     44962
022 A000008 MORGAN STANLEY & CO. INC.
022 B000008 13-2655998
022 C000008    246113
022 D000008     44191
022 A000009 UBS SECURITIES
022 B000009 13-2932996
022 C000009    122393
022 D000009    105865
022 A000010 STANDARD CHARTERED BANK
022 B000010 94-1595409
022 C000010    116255
022 D000010     54318
023 C000000    8673135
023 D000000     719772
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
<PAGE>      PAGE  4
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 Y
029  00AA00 N
030 A00AA00      0
030 B00AA00  0.00
030 C00AA00  0.00
034  00AA00 N
035  00AA00      0
036 B00AA00      0
037  00AA00 N
038  00AA00      0
039  00AA00 Y
040  00AA00 Y
041  00AA00 N
042 A00AA00   0
042 B00AA00   0
042 C00AA00   0
042 D00AA00   0
042 E00AA00   0
042 F00AA00   0
042 G00AA00   0
042 H00AA00   0
043  00AA00      0
044  00AA00      0
049  00AA00 N
050  00AA00 N
051  00AA00 N
052  00AA00 N
053 A00AA00 Y
053 B00AA00 Y
054 A00AA00 Y
054 B00AA00 N
054 C00AA00 Y
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 Y
054 L00AA00 Y
054 M00AA00 N
054 N00AA00 Y
054 O00AA00 N
055 A00AA00 N
055 B00AA00 N
<PAGE>      PAGE  5
056  00AA00 Y
057  00AA00 N
058 A00AA00 N
058 B00AA00 N
058 C00AA00 N
058 D00AA00 N
058 E00AA00 N
059  00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061  00AA00        0
077 A000000 Y
077 B000000 Y
077 C000000 Y
077 Q010000 Y
078  000000 N
080 A00AA00 LLOYDS OF LONDON
080 C00AA00     6000
081 A00AA00 N
081 B00AA00   0
082 A00AA00 N
082 B00AA00        0
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
008 A000101 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B000101 A
008 C000101 801-8059
008 D010101 SPRINGFIELD
008 D020101 MA
008 D030101 01111
015 A000101 INVESTORS BANK & TRUST COMPANY
015 B000101 C
015 C010101 BOSTON
015 C020101 MA
015 C030101 02111
015 E010101 X
024  000100 N
028 A010100     23448
028 A020100         0
028 A030100         0
028 A040100     38683
028 B010100     13870
028 B020100       133
028 B030100         0
028 B040100     33049
028 C010100     10863
028 C020100         0
<PAGE>      PAGE  6
028 C030100         0
028 C040100     10462
028 D010100     24018
028 D020100         0
028 D030100         0
028 D040100     31631
028 E010100     25529
028 E020100         0
028 E030100         0
028 E040100     27200
028 F010100     57096
028 F020100     12949
028 F030100         0
028 F040100     33188
028 G010100    154824
028 G020100     13082
028 G030100         0
028 G040100    174213
028 H000100         0
045  000100 Y
046  000100 N
047  000100 Y
048  000100  0.450
048 A010100        0
048 A020100 0.000
048 B010100        0
048 B020100 0.000
048 C010100        0
048 C020100 0.000
048 D010100        0
048 D020100 0.000
048 E010100        0
048 E020100 0.000
048 F010100        0
048 F020100 0.000
048 G010100        0
048 G020100 0.000
048 H010100        0
048 H020100 0.000
048 I010100        0
048 I020100 0.000
048 J010100        0
048 J020100 0.000
048 K010100        0
048 K020100 0.000
062 A000100 Y
062 B000100   0.0
062 C000100   0.6
062 D000100   0.0
062 E000100   0.0
062 F000100   0.0
<PAGE>      PAGE  7
062 G000100   0.0
062 H000100   0.0
062 I000100  99.8
062 J000100   0.0
062 K000100   0.0
062 L000100   0.0
062 M000100   0.0
062 N000100   0.0
062 O000100   0.0
062 P000100   0.0
062 Q000100   0.0
062 R000100   0.0
063 A000100  45
063 B000100  0.0
064 A000100 N
064 B000100 N
066 A000100 N
067  000100 N
068 A000100 N
068 B000100 N
069  000100 N
070 A010100 Y
070 A020100 N
070 B010100 Y
070 B020100 N
070 C010100 Y
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 Y
070 E020100 N
070 F010100 Y
070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 Y
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 Y
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
<PAGE>      PAGE  8
070 P010100 N
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 Y
070 R020100 N
071 A000100         0
071 B000100         0
071 C000100         0
071 D000100    0
072 A000100 12
072 B000100    14351
072 C000100        0
072 D000100        0
072 E000100        0
072 F000100     1150
072 G000100      209
072 H000100        0
072 I000100        0
072 J000100       27
072 K000100        0
072 L000100        0
072 M000100       15
072 N000100        0
072 O000100        0
072 P000100        0
072 Q000100        0
072 R000100        7
072 S000100        1
072 T000100        0
072 U000100        0
072 V000100        0
072 W000100        0
072 X000100     1410
072 Y000100       89
072 Z000100    13030
072AA000100        0
072BB000100        5
072CC010100       11
072CC020100        0
072DD010100    13067
072DD020100       15
072EE000100        0
073 A010100   0.0000
073 A020100   0.0000
073 B000100   0.0000
073 C000100   0.0000
074 A000100        1
074 B000100        0
074 C000100   259995
074 D000100        0
<PAGE>      PAGE  9
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100        0
074 K000100        9
074 L000100      968
074 M000100        0
074 N000100   260973
074 O000100        0
074 P000100      113
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100     1799
074 S000100        0
074 T000100   259061
074 U010100     1714
074 U020100        2
074 V010100     0.00
074 V020100     0.00
074 W000100   0.0000
074 X000100        4
074 Y000100        0
075 A000100        0
075 B000100   255620
076  000100     0.00
008 A000201 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B000201 A
008 C000201 801-8059
008 D010201 SPRINGFIELD
008 D020201 MA
008 D030201 01111
015 A000201 INVESTORS BANK & TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02111
015 E010201 X
024  000200 N
028 A010200      2410
028 A020200         0
028 A030200         0
028 A040200      1456
028 B010200      3982
028 B020200       140
028 B030200         0
028 B040200       960
028 C010200      3799
<PAGE>      PAGE  10
028 C020200         0
028 C030200         0
028 C040200      3017
028 D010200      7138
028 D020200         0
028 D030200         0
028 D040200      2364
028 E010200      3811
028 E020200         0
028 E030200         0
028 E040200      1948
028 F010200      5143
028 F020200      8084
028 F030200         0
028 F040200     10068
028 G010200     26283
028 G020200      8224
028 G030200         0
028 G040200     19813
028 H000200         0
045  000200 Y
046  000200 N
047  000200 Y
048  000200  0.450
048 A010200        0
048 A020200 0.000
048 B010200        0
048 B020200 0.000
048 C010200        0
048 C020200 0.000
048 D010200        0
048 D020200 0.000
048 E010200        0
048 E020200 0.000
048 F010200        0
048 F020200 0.000
048 G010200        0
048 G020200 0.000
048 H010200        0
048 H020200 0.000
048 I010200        0
048 I020200 0.000
048 J010200        0
048 J020200 0.000
048 K010200        0
048 K020200 0.000
062 A000200 Y
062 B000200   0.0
062 C000200   0.0
062 D000200   0.0
062 E000200   0.0
<PAGE>      PAGE  11
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200  14.7
062 J000200   0.0
062 K000200   0.0
062 L000200   0.0
062 M000200  43.3
062 N000200  16.9
062 O000200   0.0
062 P000200  16.1
062 Q000200   7.6
062 R000200   0.0
063 A000200   0
063 B000200  5.0
064 A000200 N
064 B000200 N
066 A000200 N
067  000200 N
068 A000200 N
068 B000200 N
069  000200 N
070 A010200 Y
070 A020200 N
070 B010200 Y
070 B020200 N
070 C010200 Y
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 Y
070 E020200 N
070 F010200 Y
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 Y
070 K010200 Y
070 K020200 N
070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 N
070 N010200 Y
070 N020200 N
070 O010200 Y
<PAGE>      PAGE  12
070 O020200 N
070 P010200 N
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 Y
070 R020200 N
071 A000200    134789
071 B000200     53935
071 C000200     87935
071 D000200   61
072 A000200 12
072 B000200     8783
072 C000200        0
072 D000200        0
072 E000200        0
072 F000200      606
072 G000200      107
072 H000200        0
072 I000200        0
072 J000200       15
072 K000200        0
072 L000200        0
072 M000200       15
072 N000200        0
072 O000200        0
072 P000200        0
072 Q000200        0
072 R000200        4
072 S000200        1
072 T000200        0
072 U000200        0
072 V000200        0
072 W000200        0
072 X000200      749
072 Y000200       48
072 Z000200     8082
072AA000200        0
072BB000200      275
072CC010200        0
072CC020200      385
072DD010200     8135
072DD020200       17
072EE000200       71
073 A010200   0.0000
073 A020200   0.0000
073 B000200   0.0000
073 C000200   0.0000
074 A000200        2
074 B000200        0
074 C000200    21399
<PAGE>      PAGE  13
074 D000200   122160
074 E000200        0
074 F000200        0
074 G000200        0
074 H000200        0
074 I000200        0
074 J000200        0
074 K000200        7
074 L000200     2351
074 M000200        0
074 N000200   145919
074 O000200        0
074 P000200       68
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200      318
074 S000200        0
074 T000200   145533
074 U010200    14365
074 U020200       35
074 V010200     0.00
074 V020200     0.00
074 W000200   0.0000
074 X000200        4
074 Y000200        0
075 A000200        0
075 B000200   134712
076  000200     0.00
008 A000301 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B000301 A
008 C000301 801-8059
008 D010301 SPRINGFIELD
008 D020301 MA
008 D030301 01111
015 A000301 INVESTORS BANK & TRUST COMPANY
015 B000301 C
015 C010301 BOSTON
015 C020301 MA
015 C030301 02111
015 E010301 X
024  000300 Y
025 A000301 GOLDMAN SACHS & CO.
025 B000301 13-5108880
025 C000301 D
025 D000301    2450
025 D000302       0
025 D000303       0
025 D000304       0
025 D000305       0
<PAGE>      PAGE  14
025 D000306       0
025 D000307       0
025 D000308       0
028 A010300      8346
028 A020300         0
028 A030300         0
028 A040300      4712
028 B010300     10627
028 B020300      2060
028 B030300         0
028 B040300      5706
028 C010300     11964
028 C020300         0
028 C030300         0
028 C040300      5080
028 D010300     15168
028 D020300         0
028 D030300         0
028 D040300      6977
028 E010300      7908
028 E020300         0
028 E030300         0
028 E040300      6960
028 F010300     12377
028 F020300     17275
028 F030300         0
028 F040300      4418
028 G010300     66390
028 G020300     19335
028 G030300         0
028 G040300     33853
028 H000300         0
045  000300 Y
046  000300 N
047  000300 Y
048  000300  0.450
048 A010300        0
048 A020300 0.000
048 B010300        0
048 B020300 0.000
048 C010300        0
048 C020300 0.000
048 D010300        0
048 D020300 0.000
048 E010300        0
048 E020300 0.000
048 F010300        0
048 F020300 0.000
048 G010300        0
048 G020300 0.000
048 H010300        0
<PAGE>      PAGE  15
048 H020300 0.000
048 I010300        0
048 I020300 0.000
048 J010300        0
048 J020300 0.000
048 K010300        0
048 K020300 0.000
062 A000300 Y
062 B000300   0.0
062 C000300   0.0
062 D000300   0.0
062 E000300   0.0
062 F000300   0.0
062 G000300   0.0
062 H000300   0.0
062 I000300   1.8
062 J000300   0.0
062 K000300   0.0
062 L000300   0.0
062 M000300  34.6
062 N000300  20.2
062 O000300   0.0
062 P000300  33.0
062 Q000300   9.2
062 R000300   0.0
063 A000300   0
063 B000300 10.7
064 A000300 N
064 B000300 N
066 A000300 N
067  000300 N
068 A000300 N
068 B000300 N
069  000300 N
070 A010300 Y
070 A020300 N
070 B010300 Y
070 B020300 N
070 C010300 Y
070 C020300 N
070 D010300 Y
070 D020300 N
070 E010300 Y
070 E020300 N
070 F010300 Y
070 F020300 N
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 N
<PAGE>      PAGE  16
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 N
070 L010300 Y
070 L020300 Y
070 M010300 Y
070 M020300 N
070 N010300 Y
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 N
070 P020300 N
070 Q010300 N
070 Q020300 N
070 R010300 Y
070 R020300 N
071 A000300    285449
071 B000300    148460
071 C000300    275315
071 D000300   54
072 A000300 12
072 B000300    20691
072 C000300        0
072 D000300        0
072 E000300        0
072 F000300     1376
072 G000300      259
072 H000300        0
072 I000300        0
072 J000300       38
072 K000300        0
072 L000300        0
072 M000300       15
072 N000300        0
072 O000300        0
072 P000300        0
072 Q000300        0
072 R000300        9
072 S000300        1
072 T000300        0
072 U000300        0
072 V000300        0
072 W000300        0
072 X000300     1699
072 Y000300      128
072 Z000300    19121
072AA000300        0
072BB000300     1886
<PAGE>      PAGE  17
072CC010300        0
072CC020300     6457
072DD010300    17374
072DD020300       16
072EE000300     1945
073 A010300   0.0000
073 A020300   0.0000
073 B000300   0.0000
073 C000300   0.0000
074 A000300        5
074 B000300        0
074 C000300     6492
074 D000300   346243
074 E000300        0
074 F000300        0
074 G000300        0
074 H000300        0
074 I000300        0
074 J000300        0
074 K000300       18
074 L000300     4954
074 M000300        0
074 N000300   357712
074 O000300      143
074 P000300      166
074 Q000300        0
074 R010300        0
074 R020300        0
074 R030300        0
074 R040300      338
074 S000300        0
074 T000300   357065
074 U010300    34142
074 U020300       35
074 V010300     0.00
074 V020300     0.00
074 W000300   0.0000
074 X000300        4
074 Y000300    22207
075 A000300        0
075 B000300   305704
076  000300     0.00
008 A000401 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B000401 A
008 C000401 801-8059
008 D010401 SPRINGFIELD
008 D020401 MA
008 D030401 01111
008 A000402 DAVID L. BABSON AND COMPANY INCORPORATED
008 B000402 S
008 C000402 801-241
<PAGE>      PAGE  18
008 D010402 CAMBRIDGE
008 D020402 MA
008 D030402 02142
008 D040402 1300
015 A000401 INVESTORS BANK & TRUST COMPANY
015 B000401 C
015 C010401 BOSTON
015 C020401 MA
015 C030401 02111
015 E010401 X
024  000400 Y
025 A000401 AMERICAN EXPRESS CO.
025 B000401 13-4922250
025 C000401 E
025 D000401    4322
025 A000402 GOLDMAN SACHS & CO.
025 B000402 13-5108880
025 C000402 D
025 D000402     980
025 D000403       0
025 D000404       0
025 D000405       0
025 D000406       0
025 D000407       0
025 D000408       0
028 A010400     14342
028 A020400         0
028 A030400         0
028 A040400     16231
028 B010400     11398
028 B020400      1057
028 B030400         0
028 B040400      9978
028 C010400     11491
028 C020400         0
028 C030400         0
028 C040400     12248
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028 D020400         0
028 D030400         0
028 D040400     12115
028 E010400     12975
028 E020400         0
028 E030400         0
028 E040400     13396
028 F010400     34050
028 F020400     26286
028 F030400         0
028 F040400     13526
028 G010400     96760
028 G020400     27343
<PAGE>      PAGE  19
028 G030400         0
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028 H000400         0
045  000400 Y
046  000400 N
047  000400 Y
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048 A020400 0.000
048 B010400        0
048 B020400 0.000
048 C010400        0
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048 E020400 0.000
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048 H020400 0.000
048 I010400        0
048 I020400 0.000
048 J010400        0
048 J020400 0.000
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048 K020400 0.000
062 A000400 N
062 B000400   0.0
062 C000400   0.0
062 D000400   0.0
062 E000400   0.0
062 F000400   0.0
062 G000400   0.0
062 H000400   0.0
062 I000400   0.0
062 J000400   0.0
062 K000400   0.0
062 L000400   0.0
062 M000400   0.0
062 N000400   0.0
062 O000400   0.0
062 P000400   0.0
062 Q000400   0.0
062 R000400   0.0
066 A000400 N
067  000400 Y
068 A000400 N
068 B000400 N
<PAGE>      PAGE  20
069  000400 N
070 A010400 Y
070 A020400 N
070 B010400 Y
070 B020400 N
070 C010400 Y
070 C020400 N
070 D010400 Y
070 D020400 N
070 E010400 Y
070 E020400 N
070 F010400 Y
070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 N
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 N
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 Y
070 R020400 N
071 A000400    130659
071 B000400     84078
071 C000400    329226
071 D000400   26
072 A000400 12
072 B000400    15134
072 C000400     6800
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<PAGE>      PAGE  21
072 K000400        0
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072 O000400        0
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072 Q000400        0
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072 S000400        3
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072 X000400     2790
072 Y000400      203
072 Z000400    19348
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072DD010400    19442
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072EE000400     7890
073 A010400   0.0000
073 A020400   0.0000
073 B000400   0.0000
073 C000400   0.0000
074 A000400        2
074 B000400        0
074 C000400   170485
074 D000400    89304
074 E000400        0
074 F000400   283078
074 G000400        0
074 H000400        0
074 I000400        0
074 J000400      247
074 K000400       22
074 L000400    21618
074 M000400        0
074 N000400   564756
074 O000400       87
074 P000400      254
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400      729
074 S000400        0
074 T000400   563686
074 U010400    45632
<PAGE>      PAGE  22
074 U020400       33
074 V010400     0.00
074 V020400     0.00
074 W000400   0.0000
074 X000400        4
074 Y000400     8094
075 A000400        0
075 B000400   504705
076  000400     0.00
008 A000501 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B000501 A
008 C000501 801-8059
008 D010501 SPRINGFIELD
008 D020501 MA
008 D030501 01111
008 A000502 DAVID L. BABSON AND COMPANY INCORPORATED
008 B000502 S
008 C000502 801-241
008 D010502 CAMBRIDGE
008 D020502 MA
008 D030502 02142
008 D040502 1300
015 A000501 INVESTORS BANK & TRUST COMPANY
015 B000501 C
015 C010501 BOSTON
015 C020501 MA
015 C030501 02111
015 E010501 X
024  000500 Y
025 A000501 AMERICAN EXPRESS CO
025 B000501 13-4922250
025 C000501 E
025 D000501   37573
025 D000502       0
025 D000503       0
025 D000504       0
025 D000505       0
025 D000506       0
025 D000507       0
025 D000508       0
028 A010500     48907
028 A020500         0
028 A030500         0
028 A040500     51301
028 B010500     45531
028 B020500      1273
028 B030500         0
028 B040500     36475
028 C010500     44455
028 C020500         0
028 C030500         0
<PAGE>      PAGE  23
028 C040500     33439
028 D010500     49041
028 D020500         0
028 D030500         0
028 D040500     81297
028 E010500     41667
028 E020500         0
028 E030500         0
028 E040500     38586
028 F010500     47680
028 F020500    119321
028 F030500         0
028 F040500     73483
028 G010500    277281
028 G020500    120594
028 G030500         0
028 G040500    314581
028 H000500         0
045  000500 Y
046  000500 N
047  000500 Y
048  000500  0.450
048 A010500        0
048 A020500 0.000
048 B010500        0
048 B020500 0.000
048 C010500        0
048 C020500 0.000
048 D010500        0
048 D020500 0.000
048 E010500        0
048 E020500 0.000
048 F010500        0
048 F020500 0.000
048 G010500        0
048 G020500 0.000
048 H010500        0
048 H020500 0.000
048 I010500        0
048 I020500 0.000
048 J010500        0
048 J020500 0.000
048 K010500        0
048 K020500 0.000
062 A000500 N
062 B000500   0.0
062 C000500   0.0
062 D000500   0.0
062 E000500   0.0
062 F000500   0.0
062 G000500   0.0
<PAGE>      PAGE  24
062 H000500   0.0
062 I000500   0.0
062 J000500   0.0
062 K000500   0.0
062 L000500   0.0
062 M000500   0.0
062 N000500   0.0
062 O000500   0.0
062 P000500   0.0
062 Q000500   0.0
062 R000500   0.0
066 A000500 Y
066 E000500 Y
067  000500 N
068 A000500 N
068 B000500 N
069  000500 N
070 A010500 Y
070 A020500 N
070 B010500 Y
070 B020500 N
070 C010500 Y
070 C020500 N
070 D010500 Y
070 D020500 N
070 E010500 Y
070 E020500 N
070 F010500 Y
070 F020500 N
070 G010500 Y
070 G020500 N
070 H010500 Y
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 Y
070 K020500 N
070 L010500 Y
070 L020500 Y
070 M010500 Y
070 M020500 N
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 N
070 P020500 N
070 Q010500 N
070 Q020500 N
<PAGE>      PAGE  25
070 R010500 Y
070 R020500 N
071 A000500    366428
071 B000500    281829
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072 A000500 12
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072 S000500       12
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072 X000500    12766
072 Y000500     1078
072 Z000500    55712
072AA000500    74041
072BB000500        0
072CC010500   296455
072CC020500        0
072DD010500    55921
072DD020500        7
072EE000500    64666
073 A010500   0.0000
073 A020500   0.0000
073 B000500   0.0000
073 C000500   0.0000
074 A000500        0
074 B000500        0
074 C000500   114179
074 D000500        0
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074 G000500        0
074 H000500        0
<PAGE>      PAGE  26
074 I000500        0
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074 K000500      107
074 L000500     7026
074 M000500        0
074 N000500  2489877
074 O000500      482
074 P000500     1187
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074 R020500        0
074 R030500        0
074 R040500     2000
074 S000500        0
074 T000500  2486208
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074 U020500       32
074 V010500     0.00
074 V020500     0.00
074 W000500   0.0000
074 X000500        4
074 Y000500        0
075 A000500        0
075 B000500  2306139
076  000500     0.00
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 DAVID L. BABSON AND COMPANY INCORPORATED
008 B000602 S
008 C000602 801-241
008 D010602 CAMBRIDGE
008 D020602 MA
008 D030602 02142
008 D040602 1300
015 A000601 INVESTORS BANK & TRUST COMPANY
015 B000601 C
015 C010601 BOSTON
015 C020601 MA
015 C030601 02111
015 E010601 X
024  000600 N
028 A010600     11545
028 A020600         0
028 A030600         0
028 A040600     10727
028 B010600      8844
028 B020600        99
<PAGE>      PAGE  27
028 B030600         0
028 B040600      6933
028 C010600      8890
028 C020600         0
028 C030600         0
028 C040600      6197
028 D010600     12234
028 D020600         0
028 D030600         0
028 D040600     10040
028 E010600     10113
028 E020600         0
028 E030600         0
028 E040600     35645
028 F010600     12065
028 F020600     20005
028 F030600         0
028 F040600     13079
028 G010600     63691
028 G020600     20104
028 G030600         0
028 G040600     82621
028 H000600         0
045  000600 Y
046  000600 N
047  000600 Y
048  000600  0.550
048 A010600        0
048 A020600 0.000
048 B010600        0
048 B020600 0.000
048 C010600        0
048 C020600 0.000
048 D010600        0
048 D020600 0.000
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048 E020600 0.000
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048 F020600 0.000
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048 G020600 0.000
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048 H020600 0.000
048 I010600        0
048 I020600 0.000
048 J010600        0
048 J020600 0.000
048 K010600        0
048 K020600 0.000
062 A000600 N
062 B000600   0.0
<PAGE>      PAGE  28
062 C000600   0.0
062 D000600   0.0
062 E000600   0.0
062 F000600   0.0
062 G000600   0.0
062 H000600   0.0
062 I000600   0.0
062 J000600   0.0
062 K000600   0.0
062 L000600   0.0
062 M000600   0.0
062 N000600   0.0
062 O000600   0.0
062 P000600   0.0
062 Q000600   0.0
062 R000600   0.0
066 A000600 Y
066 E000600 Y
067  000600 N
068 A000600 N
068 B000600 N
069  000600 N
070 A010600 Y
070 A020600 N
070 B010600 Y
070 B020600 N
070 C010600 Y
070 C020600 N
070 D010600 Y
070 D020600 N
070 E010600 Y
070 E020600 N
070 F010600 Y
070 F020600 N
070 G010600 Y
070 G020600 N
070 H010600 Y
070 H020600 N
070 I010600 N
070 I020600 N
070 J010600 Y
070 J020600 N
070 K010600 Y
070 K020600 N
070 L010600 Y
070 L020600 N
070 M010600 Y
070 M020600 N
070 N010600 Y
070 N020600 N
070 O010600 Y
<PAGE>      PAGE  29
070 O020600 N
070 P010600 N
070 P020600 N
070 Q010600 N
070 Q020600 N
070 R010600 Y
070 R020600 N
071 A000600    126866
071 B000600    107156
071 C000600    381359
071 D000600   28
072 A000600 12
072 B000600    10402
072 C000600     2168
072 D000600        0
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072 K000600        0
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072 S000600        2
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072 X000600     2738
072 Y000600      182
072 Z000600    10014
072AA000600    15188
072BB000600        0
072CC010600    63151
072CC020600        0
072DD010600     9914
072DD020600        7
072EE000600    10183
073 A010600   0.0000
073 A020600   0.0000
073 B000600   0.0000
073 C000600   0.0000
074 A000600       17
074 B000600        0
074 C000600     6342
<PAGE>      PAGE  30
074 D000600        0
074 E000600        0
074 F000600   450139
074 G000600        0
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074 L000600     1006
074 M000600        0
074 N000600   458114
074 O000600      124
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074 R030600        0
074 R040600      371
074 S000600        0
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074 U010600    34014
074 U020600       32
074 V010600     0.00
074 V020600     0.00
074 W000600   0.0000
074 X000600        4
074 Y000600        0
075 A000600        0
075 B000600   417907
076  000600     0.00
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
008 B000702 S
008 C000702 801-27136
008 D010702 NEW YORK
008 D020702 NY
008 D030702 10048
008 D040702 0203
015 A000701 INVESTORS BANK & TRUST COMPANY
015 B000701 C
015 C010701 BOSTON
015 C020701 MA
015 C030701 02111
015 E010701 X
015 A000702 CITIBANK
015 B000702 S
<PAGE>      PAGE  31
015 C010702 NEW YORK
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
015 E040703 X
015 A000704 NATIONAL AUSTRALIAN BANK
015 B000704 S
015 C010704 MELBOURNE
015 D010704 AUSTRALIA
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
015 B000706 S
015 C010706 LONDON
015 D010706 ENGLAND
015 D020706 EC2V 7SB
015 E040706 X
015 A000707 BANK OF BOSTON
015 B000707 S
015 C010707 BOSTON
015 C020707 MA
015 C030707 02110
015 E040707 X
015 A000708 BANK OF IRELAND
015 B000708 S
015 C010708 DUBLIN
015 D010708 IRELAND
015 D020708 2
015 E040708 X
015 A000709 BANCOMER SA
015 B000709 S
015 C010709 MEXICO CITY
015 D010709 MEXICO
015 D020709 03339
015 E040709 X
015 A000710 BARCLAYS BANK
015 B000710 S
015 C010710 LONDON
015 D010710 ENGLAND
015 D020710 EC3N 4HJ
015 E040710 X
<PAGE>      PAGE  32
015 A000711 THE STANDARD BANK OF SOUTH AFRICA LTD
015 B000711 S
015 C010711 JOHANNESBURG
015 D010711 SOUTH AFRICA
015 E040711 X
015 A000712 ROYAL TRUST CORPORATION OF CANADA
015 B000712 S
015 C010712 TORONTO
015 D010712 CANADA
015 E040712 X
024  000700 Y
025 A000701 NOMURA SECURITIES
025 C000701 E
025 D000701    3748
025 A000702 SOCIETE GENERALE, PARIS
025 C000702 E
025 D000702    2158
025 A000703 STANDARD CHARTERED BANK
025 B000703 94-1595409
025 C000703 E
025 D000703    4295
025 D000704       0
025 D000705       0
025 D000706       0
025 D000707       0
025 D000708       0
028 A010700     11665
028 A020700         0
028 A030700         0
028 A040700      5224
028 B010700     11987
028 B020700      1194
028 B030700         0
028 B040700      4671
028 C010700     12057
028 C020700         0
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028 C040700      6806
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028 D040700      6203
028 E010700     12722
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028 E030700         0
028 E040700      5314
028 F010700     15269
028 F020700      6152
028 F030700         0
028 F040700      6469
028 G010700     79038
<PAGE>      PAGE  33
028 G020700      7346
028 G030700         0
028 G040700     34687
028 H000700         0
045  000700 Y
046  000700 N
047  000700 Y
048  000700  0.850
048 A010700        0
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048 B010700        0
048 B020700 0.000
048 C010700        0
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048 I010700        0
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048 J020700 0.000
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048 K020700 0.000
062 A000700 N
062 B000700   0.0
062 C000700   0.0
062 D000700   0.0
062 E000700   0.0
062 F000700   0.0
062 G000700   0.0
062 H000700   0.0
062 I000700   0.0
062 J000700   0.0
062 K000700   0.0
062 L000700   0.0
062 M000700   0.0
062 N000700   0.0
062 O000700   0.0
062 P000700   0.0
062 Q000700   0.0
062 R000700   0.0
066 A000700 Y
066 G000700 Y
067  000700 N
<PAGE>      PAGE  34
068 A000700 N
068 B000700 N
069  000700 N
070 A010700 Y
070 A020700 N
070 B010700 Y
070 B020700 N
070 C010700 Y
070 C020700 N
070 D010700 Y
070 D020700 N
070 E010700 Y
070 E020700 N
070 F010700 Y
070 F020700 N
070 G010700 Y
070 G020700 N
070 H010700 Y
070 H020700 N
070 I010700 N
070 I020700 N
070 J010700 Y
070 J020700 Y
070 K010700 Y
070 K020700 N
070 L010700 Y
070 L020700 Y
070 M010700 Y
070 M020700 Y
070 N010700 Y
070 N020700 N
070 O010700 Y
070 O020700 Y
070 P010700 N
070 P020700 N
070 Q010700 N
070 Q020700 N
070 R010700 Y
070 R020700 N
071 A000700    255790
071 B000700    161400
071 C000700    279558
071 D000700   58
072 A000700 12
072 B000700      350
072 C000700     4156
072 D000700        0
072 E000700        0
072 F000700     2398
072 G000700      276
072 H000700        0
<PAGE>      PAGE  35
072 I000700        0
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072 K000700        0
072 L000700        0
072 M000700       15
072 N000700        0
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072EE000700        0
073 A010700   0.0000
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073 B000700   0.0000
073 C000700   0.0000
074 A000700     4987
074 B000700        0
074 C000700        0
074 D000700        0
074 E000700        0
074 F000700   356321
074 G000700        0
074 H000700        0
074 I000700      916
074 J000700     1784
074 K000700       55
074 L000700      759
074 M000700      612
074 N000700   365434
074 O000700     6371
074 P000700      284
074 Q000700        0
074 R010700        0
074 R020700        0
074 R030700        0
074 R040700     2127
074 S000700        0
<PAGE>      PAGE  36
074 T000700   356652
074 U010700    32070
074 U020700       31
074 V010700     0.00
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074 X000700        4
074 Y000700        0
075 A000700        0
075 B000700   282131
076  000700     0.00
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 year ended December 31, 1996
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
   <NUMBER> 31
   <NAME> Core Bond Fund, Class 1
       
<S>                            <C>
<PERIOD-TYPE>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      348,014,562
<INVESTMENTS-AT-VALUE>                     352,734,624
<RECEIVABLES>                                4,972,581
<ASSETS-OTHER>                                   4,936
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             357,712,141
<PAYABLE-FOR-SECURITIES>                       142,615
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      504,349
<TOTAL-LIABILITIES>                            646,964
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   352,396,989
<SHARES-COMMON-STOCK>                           11,512
<SHARES-COMMON-PRIOR>                           15,844
<ACCUMULATED-NII-CURRENT>                    1,845,746
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     (1,885,881)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     4,708,323
<NET-ASSETS>                                   120,838
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                8,751
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   2,135
<NET-INVESTMENT-INCOME>                          6,616
<REALIZED-GAINS-CURRENT>                          (433)
<APPREC-INCREASE-CURRENT>                       (5,258)
<NET-CHANGE-FROM-OPS>                              925
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        4,416
<DISTRIBUTIONS-OF-GAINS>                           740
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            429
<NUMBER-OF-SHARES-REDEEMED>                      5,250
<SHARES-REINVESTED>                                489
<NET-CHANGE-IN-ASSETS>                         (50,089)
<ACCUMULATED-NII-PRIOR>                        114,829
<ACCUMULATED-GAINS-PRIOR>                    1,944,986
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,375,667
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,698,976
<AVERAGE-NET-ASSETS>                           129,650
<PER-SHARE-NAV-BEGIN>                            10.79
<PER-SHARE-NII>                                   0.53
<PER-SHARE-GAIN-APPREC>                          (0.36)
<PER-SHARE-DIVIDEND>                             (0.40)
<PER-SHARE-DISTRIBUTIONS>                        (0.06)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.50
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      348,014,562
<INVESTMENTS-AT-VALUE>                     352,734,624
<RECEIVABLES>                                4,972,581
<ASSETS-OTHER>                                   4,936
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             357,712,141
<PAYABLE-FOR-SECURITIES>                       142,615
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      504,349
<TOTAL-LIABILITIES>                            646,964
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   352,396,989
<SHARES-COMMON-STOCK>                           11,631
<SHARES-COMMON-PRIOR>                           11,069
<ACCUMULATED-NII-CURRENT>                    1,845,746
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     (1,885,881)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     4,708,323
<NET-ASSETS>                                   122,293
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                8,013
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,299
<NET-INVESTMENT-INCOME>                          6,714
<REALIZED-GAINS-CURRENT>                          (663)
<APPREC-INCREASE-CURRENT>                       (3,478)
<NET-CHANGE-FROM-OPS>                            2,573
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        5,227
<DISTRIBUTIONS-OF-GAINS>                           714
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                562
<NET-CHANGE-IN-ASSETS>                           2,573
<ACCUMULATED-NII-PRIOR>                        114,829
<ACCUMULATED-GAINS-PRIOR>                    1,944,986
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,375,667
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,698,976
<AVERAGE-NET-ASSETS>                           118,456
<PER-SHARE-NAV-BEGIN>                            10.82
<PER-SHARE-NII>                                   0.60
<PER-SHARE-GAIN-APPREC>                          (0.38)
<PER-SHARE-DIVIDEND>                             (0.47)
<PER-SHARE-DISTRIBUTIONS>                        (0.06)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.51
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      348,014,562
<INVESTMENTS-AT-VALUE>                     352,734,624
<RECEIVABLES>                                4,972,581
<ASSETS-OTHER>                                   4,936
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             357,712,141
<PAYABLE-FOR-SECURITIES>                       142,615
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      504,349
<TOTAL-LIABILITIES>                            646,964
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   352,396,989
<SHARES-COMMON-STOCK>                           11,699
<SHARES-COMMON-PRIOR>                           11,095
<ACCUMULATED-NII-CURRENT>                    1,845,746
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     (1,885,881)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     4,708,323
<NET-ASSETS>                                   123,107
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                8,051
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     892
<NET-INVESTMENT-INCOME>                          7,159
<REALIZED-GAINS-CURRENT>                          (665)
<APPREC-INCREASE-CURRENT>                       (3,487)
<NET-CHANGE-FROM-OPS>                            3,007
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        5,674
<DISTRIBUTIONS-OF-GAINS>                           715
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                604
<NET-CHANGE-IN-ASSETS>                           3,007
<ACCUMULATED-NII-PRIOR>                        114,829
<ACCUMULATED-GAINS-PRIOR>                    1,944,986
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,375,667
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,698,976
<AVERAGE-NET-ASSETS>                           119,036
<PER-SHARE-NAV-BEGIN>                            10.82
<PER-SHARE-NII>                                   0.64
<PER-SHARE-GAIN-APPREC>                          (0.37)
<PER-SHARE-DIVIDEND>                             (0.51)
<PER-SHARE-DISTRIBUTIONS>                        (0.06)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.52
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      348,014,562
<INVESTMENTS-AT-VALUE>                     352,734,624
<RECEIVABLES>                                4,972,581
<ASSETS-OTHER>                                   4,936
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             357,712,141
<PAYABLE-FOR-SECURITIES>                       142,615
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      504,349
<TOTAL-LIABILITIES>                            646,964
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   352,396,989
<SHARES-COMMON-STOCK>                       34,141,922
<SHARES-COMMON-PRIOR>                       23,578,010
<ACCUMULATED-NII-CURRENT>                    1,845,746
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     (1,885,881)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     4,708,323
<NET-ASSETS>                               356,698,939
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           20,666,644
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               1,566,380
<NET-INVESTMENT-INCOME>                     19,100,264
<REALIZED-GAINS-CURRENT>                    (1,884,332)
<APPREC-INCREASE-CURRENT>                   (6,444,659)
<NET-CHANGE-FROM-OPS>                       10,771,273
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   17,374,307
<DISTRIBUTIONS-OF-GAINS>                     1,942,817
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     15,244,478
<NUMBER-OF-SHARES-REDEEMED>                  6,519,179
<SHARES-REINVESTED>                          1,838,613
<NET-CHANGE-IN-ASSETS>                     103,158,860
<ACCUMULATED-NII-PRIOR>                        114,829
<ACCUMULATED-GAINS-PRIOR>                    1,944,986
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,375,667
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,698,976
<AVERAGE-NET-ASSETS>                       305,336,628
<PER-SHARE-NAV-BEGIN>                            10.75
<PER-SHARE-NII>                                   0.67
<PER-SHARE-GAIN-APPREC>                          (0.37)
<PER-SHARE-DIVIDEND>                             (0.54)
<PER-SHARE-DISTRIBUTIONS>                        (0.06)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.45
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                    1,768,842,158
<INVESTMENTS-AT-VALUE>                   2,480,700,084
<RECEIVABLES>                                9,176,728
<ASSETS-OTHER>                                     190
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,489,877,002
<PAYABLE-FOR-SECURITIES>                       481,850
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,186,917
<TOTAL-LIABILITIES>                          3,668,767
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,759,761,092
<SHARES-COMMON-STOCK>                           10,640
<SHARES-COMMON-PRIOR>                           10,237
<ACCUMULATED-NII-CURRENT>                      410,862
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     14,178,355
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   711,857,926
<NET-ASSETS>                                   153,607
<DIVIDEND-INCOME>                                4,094
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   2,308
<NET-INVESTMENT-INCOME>                          1,786
<REALIZED-GAINS-CURRENT>                         4,508
<APPREC-INCREASE-CURRENT>                       18,055
<NET-CHANGE-FROM-OPS>                           24,349
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        1,849
<DISTRIBUTIONS-OF-GAINS>                         4,035
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                403
<NET-CHANGE-IN-ASSETS>                          24,349
<ACCUMULATED-NII-PRIOR>                        626,868
<ACCUMULATED-GAINS-PRIOR>                    4,803,720
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       10,377,627
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             12,765,654
<AVERAGE-NET-ASSETS>                           140,077
<PER-SHARE-NAV-BEGIN>                            12.63
<PER-SHARE-NII>                                   0.17
<PER-SHARE-GAIN-APPREC>                           2.21
<PER-SHARE-DIVIDEND>                             (0.18)
<PER-SHARE-DISTRIBUTIONS>                        (0.39)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              14.44
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                    1,768,842,158
<INVESTMENTS-AT-VALUE>                   2,480,700,084
<RECEIVABLES>                                9,176,728
<ASSETS-OTHER>                                     190
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,489,877,002
<PAYABLE-FOR-SECURITIES>                       481,850
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,186,917
<TOTAL-LIABILITIES>                          3,668,767
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,759,761,092
<SHARES-COMMON-STOCK>                           10,740
<SHARES-COMMON-PRIOR>                           10,284
<ACCUMULATED-NII-CURRENT>                      410,862
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     14,178,355
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   711,857,926
<NET-ASSETS>                                   155,446
<DIVIDEND-INCOME>                                4,132
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,552
<NET-INVESTMENT-INCOME>                          2,580
<REALIZED-GAINS-CURRENT>                         4,552
<APPREC-INCREASE-CURRENT>                       18,226
<NET-CHANGE-FROM-OPS>                           25,358
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        2,628
<DISTRIBUTIONS-OF-GAINS>                         4,054
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                456
<NET-CHANGE-IN-ASSETS>                          25,358
<ACCUMULATED-NII-PRIOR>                        626,868
<ACCUMULATED-GAINS-PRIOR>                    4,803,720
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       10,377,627
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             12,765,654
<AVERAGE-NET-ASSETS>                           141,371
<PER-SHARE-NAV-BEGIN>                            12.65
<PER-SHARE-NII>                                   0.25
<PER-SHARE-GAIN-APPREC>                           2.22
<PER-SHARE-DIVIDEND>                             (0.26)
<PER-SHARE-DISTRIBUTIONS>                        (0.39)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              14.47
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                    1,768,842,158
<INVESTMENTS-AT-VALUE>                   2,480,700,084
<RECEIVABLES>                                9,176,728
<ASSETS-OTHER>                                     190
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,489,877,002
<PAYABLE-FOR-SECURITIES>                       481,850
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,186,917
<TOTAL-LIABILITIES>                          3,668,767
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,759,761,092
<SHARES-COMMON-STOCK>                           10,793
<SHARES-COMMON-PRIOR>                           10,301
<ACCUMULATED-NII-CURRENT>                      410,862
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     14,178,355
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   711,857,926
<NET-ASSETS>                                   156,351
<DIVIDEND-INCOME>                                4,149
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,065
<NET-INVESTMENT-INCOME>                          3,084
<REALIZED-GAINS-CURRENT>                         4,571
<APPREC-INCREASE-CURRENT>                       18,305
<NET-CHANGE-FROM-OPS>                           25,960
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        3,152
<DISTRIBUTIONS-OF-GAINS>                         4,061
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                492
<NET-CHANGE-IN-ASSETS>                          25,960
<ACCUMULATED-NII-PRIOR>                        626,868
<ACCUMULATED-GAINS-PRIOR>                    4,803,720
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       10,377,627
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             12,765,654
<AVERAGE-NET-ASSETS>                           141,951
<PER-SHARE-NAV-BEGIN>                            12.66
<PER-SHARE-NII>                                   0.30
<PER-SHARE-GAIN-APPREC>                           2.23
<PER-SHARE-DIVIDEND>                             (0.31)
<PER-SHARE-DISTRIBUTIONS>                        (0.39)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              14.49
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                    1,768,842,158
<INVESTMENTS-AT-VALUE>                   2,480,700,084
<RECEIVABLES>                                9,176,728
<ASSETS-OTHER>                                     190
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,489,877,002
<PAYABLE-FOR-SECURITIES>                       481,850
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    3,186,917
<TOTAL-LIABILITIES>                          3,668,767
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,759,761,092
<SHARES-COMMON-STOCK>                      171,928,663
<SHARES-COMMON-PRIOR>                      168,233,242
<ACCUMULATED-NII-CURRENT>                      410,862
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     14,178,355
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   711,857,926
<NET-ASSETS>                             2,485,742,831
<DIVIDEND-INCOME>                           67,387,881
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              11,683,062
<NET-INVESTMENT-INCOME>                     55,704,819
<REALIZED-GAINS-CURRENT>                    74,026,915
<APPREC-INCREASE-CURRENT>                  296,400,180
<NET-CHANGE-FROM-OPS>                      426,131,914
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   55,920,646
<DISTRIBUTIONS-OF-GAINS>                    64,653,761
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     42,761,147
<NUMBER-OF-SHARES-REDEEMED>                 47,300,940
<SHARES-REINVESTED>                          8,235,214
<NET-CHANGE-IN-ASSETS>                     360,494,426
<ACCUMULATED-NII-PRIOR>                        626,868
<ACCUMULATED-GAINS-PRIOR>                    4,803,720
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                       10,377,627
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             12,765,654
<AVERAGE-NET-ASSETS>                     2,305,715,939
<PER-SHARE-NAV-BEGIN>                            12.63
<PER-SHARE-NII>                                   0.34
<PER-SHARE-GAIN-APPREC>                           2.22
<PER-SHARE-DIVIDEND>                             (0.34)
<PER-SHARE-DISTRIBUTIONS>                        (0.39)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              14.46
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      260,002,847
<INVESTMENTS-AT-VALUE>                     259,994,759
<RECEIVABLES>                                  976,836
<ASSETS-OTHER>                                   1,293
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             260,972,888
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,911,407
<TOTAL-LIABILITIES>                          1,911,407
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   258,996,044
<SHARES-COMMON-STOCK>                              727
<SHARES-COMMON-PRIOR>                              698
<ACCUMULATED-NII-CURRENT>                       80,676
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (7,151)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        (8,088)
<NET-ASSETS>                                   109,724
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                6,040
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,772
<NET-INVESTMENT-INCOME>                          4,268
<REALIZED-GAINS-CURRENT>                            (2)
<APPREC-INCREASE-CURRENT>                           11
<NET-CHANGE-FROM-OPS>                            4,276
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        4,288
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                 28
<NET-CHANGE-IN-ASSETS>                           4,276
<ACCUMULATED-NII-PRIOR>                        132,953
<ACCUMULATED-GAINS-PRIOR>                       (2,083)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,150,292
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,410,328
<AVERAGE-NET-ASSETS>                           107,583
<PER-SHARE-NAV-BEGIN>                           151.05
<PER-SHARE-NII>                                   6.09
<PER-SHARE-GAIN-APPREC>                           0.03
<PER-SHARE-DIVIDEND>                             (6.14)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                             151.03
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      260,002,847
<INVESTMENTS-AT-VALUE>                     259,994,759
<RECEIVABLES>                                  976,836
<ASSETS-OTHER>                                   1,293
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             260,972,888
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,911,407
<TOTAL-LIABILITIES>                          1,911,407
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   258,996,044
<SHARES-COMMON-STOCK>                              734
<SHARES-COMMON-PRIOR>                              702
<ACCUMULATED-NII-CURRENT>                       80,676
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (7,151)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        (8,088)
<NET-ASSETS>                                   111,039
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                6,095
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,191
<NET-INVESTMENT-INCOME>                          4,904
<REALIZED-GAINS-CURRENT>                            (2)
<APPREC-INCREASE-CURRENT>                           11
<NET-CHANGE-FROM-OPS>                            4,913
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        4,922
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                 33
<NET-CHANGE-IN-ASSETS>                           4,913
<ACCUMULATED-NII-PRIOR>                        132,953
<ACCUMULATED-GAINS-PRIOR>                       (2,083)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,150,292
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,410,328
<AVERAGE-NET-ASSETS>                           108,572
<PER-SHARE-NAV-BEGIN>                           151.24
<PER-SHARE-NII>                                   6.96
<PER-SHARE-GAIN-APPREC>                           0.04
<PER-SHARE-DIVIDEND>                             (7.01)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                             151.23
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      260,002,847
<INVESTMENTS-AT-VALUE>                     259,994,759
<RECEIVABLES>                                  976,836
<ASSETS-OTHER>                                   1,293
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             260,972,888
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,911,407
<TOTAL-LIABILITIES>                          1,911,407
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   258,996,044
<SHARES-COMMON-STOCK>                              738
<SHARES-COMMON-PRIOR>                              703
<ACCUMULATED-NII-CURRENT>                       80,676
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (7,151)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        (8,088)
<NET-ASSETS>                                   111,694
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                6,120
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     817
<NET-INVESTMENT-INCOME>                          5,303
<REALIZED-GAINS-CURRENT>                            (2)
<APPREC-INCREASE-CURRENT>                           11
<NET-CHANGE-FROM-OPS>                            5,312
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        5,335
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                 35
<NET-CHANGE-IN-ASSETS>                           5,312
<ACCUMULATED-NII-PRIOR>                        132,953
<ACCUMULATED-GAINS-PRIOR>                       (2,083)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,150,292
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,410,328
<AVERAGE-NET-ASSETS>                           109,023
<PER-SHARE-NAV-BEGIN>                           151.32
<PER-SHARE-NII>                                   7.51
<PER-SHARE-GAIN-APPREC>                           0.05
<PER-SHARE-DIVIDEND>                             (7.59)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                             151.29
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      260,002,847
<INVESTMENTS-AT-VALUE>                     259,994,759
<RECEIVABLES>                                  976,836
<ASSETS-OTHER>                                   1,293
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             260,972,888
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,911,407
<TOTAL-LIABILITIES>                          1,911,407
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   258,996,044
<SHARES-COMMON-STOCK>                        1,713,474
<SHARES-COMMON-PRIOR>                        1,681,065
<ACCUMULATED-NII-CURRENT>                       80,676
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (7,151)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        (8,088)
<NET-ASSETS>                               258,729,024
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           14,332,595
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               1,317,325
<NET-INVESTMENT-INCOME>                     13,015,270
<REALIZED-GAINS-CURRENT>                        (5,061)
<APPREC-INCREASE-CURRENT>                       11,415
<NET-CHANGE-FROM-OPS>                       13,021,624
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   13,067,477
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,391,584
<NUMBER-OF-SHARES-REDEEMED>                  2,445,697
<SHARES-REINVESTED>                             86,522
<NET-CHANGE-IN-ASSETS>                       4,792,873
<ACCUMULATED-NII-PRIOR>                        132,953
<ACCUMULATED-GAINS-PRIOR>                       (2,083)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,150,292
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,410,328
<AVERAGE-NET-ASSETS>                       255,295,137
<PER-SHARE-NAV-BEGIN>                           151.06
<PER-SHARE-NII>                                   7.85
<PER-SHARE-GAIN-APPREC>                           0.06
<PER-SHARE-DIVIDEND>                             (7.97)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                             151.00
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      345,071,819
<INVESTMENTS-AT-VALUE>                     456,481,387
<RECEIVABLES>                                1,616,401
<ASSETS-OTHER>                                  16,575
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             458,114,363
<PAYABLE-FOR-SECURITIES>                       124,059
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      621,921
<TOTAL-LIABILITIES>                            745,980
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   340,794,078
<SHARES-COMMON-STOCK>                           10,666
<SHARES-COMMON-PRIOR>                           15,094
<ACCUMULATED-NII-CURRENT>                      192,363
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,972,374
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   111,409,568
<NET-ASSETS>                                   142,813
<DIVIDEND-INCOME>                                4,876
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   2,573
<NET-INVESTMENT-INCOME>                          2,303
<REALIZED-GAINS-CURRENT>                         5,689
<APPREC-INCREASE-CURRENT>                       16,721
<NET-CHANGE-FROM-OPS>                           24,713
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        1,430
<DISTRIBUTIONS-OF-GAINS>                         3,230
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          4,373
<NUMBER-OF-SHARES-REDEEMED>                      9,150
<SHARES-REINVESTED>                                349
<NET-CHANGE-IN-ASSETS>                         (29,232)
<ACCUMULATED-NII-PRIOR>                         99,330
<ACCUMULATED-GAINS-PRIOR>                      (33,140)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,298,488
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,738,444
<AVERAGE-NET-ASSETS>                           147,278
<PER-SHARE-NAV-BEGIN>                            11.40
<PER-SHARE-NII>                                   0.21
<PER-SHARE-GAIN-APPREC>                           2.23
<PER-SHARE-DIVIDEND>                             (0.14)
<PER-SHARE-DISTRIBUTIONS>                        (0.31)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              13.39
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      345,071,819
<INVESTMENTS-AT-VALUE>                     456,481,387
<RECEIVABLES>                                1,616,401
<ASSETS-OTHER>                                  16,575
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             458,114,363
<PAYABLE-FOR-SECURITIES>                       124,059
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      621,921
<TOTAL-LIABILITIES>                            745,980
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   340,794,078
<SHARES-COMMON-STOCK>                           10,767
<SHARES-COMMON-PRIOR>                           10,347
<ACCUMULATED-NII-CURRENT>                      192,363
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,972,374
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   111,409,568
<NET-ASSETS>                                   144,545
<DIVIDEND-INCOME>                                3,839
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,527
<NET-INVESTMENT-INCOME>                          2,312
<REALIZED-GAINS-CURRENT>                         4,657
<APPREC-INCREASE-CURRENT>                       19,237
<NET-CHANGE-FROM-OPS>                           26,206
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        2,382
<DISTRIBUTIONS-OF-GAINS>                         3,240
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                420
<NET-CHANGE-IN-ASSETS>                          26,206
<ACCUMULATED-NII-PRIOR>                         99,330
<ACCUMULATED-GAINS-PRIOR>                      (33,140)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,298,488
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,738,444
<AVERAGE-NET-ASSETS>                           127,503
<PER-SHARE-NAV-BEGIN>                            11.44
<PER-SHARE-NII>                                   0.22
<PER-SHARE-GAIN-APPREC>                           2.30
<PER-SHARE-DIVIDEND>                             (0.23)
<PER-SHARE-DISTRIBUTIONS>                        (0.31)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              13.42
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      345,071,819
<INVESTMENTS-AT-VALUE>                     456,481,387
<RECEIVABLES>                                1,616,401
<ASSETS-OTHER>                                  16,575
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             458,114,363
<PAYABLE-FOR-SECURITIES>                       124,059
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      621,921
<TOTAL-LIABILITIES>                            745,980
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   340,794,078
<SHARES-COMMON-STOCK>                           10,837
<SHARES-COMMON-PRIOR>                           10,382
<ACCUMULATED-NII-CURRENT>                      192,363
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,972,374
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   111,409,568
<NET-ASSETS>                                   145,609
<DIVIDEND-INCOME>                                3,859
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,090
<NET-INVESTMENT-INCOME>                          2,769
<REALIZED-GAINS-CURRENT>                         4,685
<APPREC-INCREASE-CURRENT>                       19,358
<NET-CHANGE-FROM-OPS>                           26,812
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        2,845
<DISTRIBUTIONS-OF-GAINS>                         3,251
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                455
<NET-CHANGE-IN-ASSETS>                          26,812
<ACCUMULATED-NII-PRIOR>                         99,330
<ACCUMULATED-GAINS-PRIOR>                      (33,140)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,298,488
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,738,444
<AVERAGE-NET-ASSETS>                           128,222
<PER-SHARE-NAV-BEGIN>                            11.44
<PER-SHARE-NII>                                   0.27
<PER-SHARE-GAIN-APPREC>                           2.31
<PER-SHARE-DIVIDEND>                             (0.27)
<PER-SHARE-DISTRIBUTIONS>                        (0.31)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              13.44
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      345,071,819
<INVESTMENTS-AT-VALUE>                     456,481,387
<RECEIVABLES>                                1,616,401
<ASSETS-OTHER>                                  16,575
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             458,114,363
<PAYABLE-FOR-SECURITIES>                       124,059
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      621,921
<TOTAL-LIABILITIES>                            745,980
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   340,794,078
<SHARES-COMMON-STOCK>                       34,013,589
<SHARES-COMMON-PRIOR>                       33,253,093
<ACCUMULATED-NII-CURRENT>                      192,363
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      4,972,374
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   111,409,568
<NET-ASSETS>                               456,935,416
<DIVIDEND-INCOME>                           12,557,494
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               2,550,949
<NET-INVESTMENT-INCOME>                     10,006,545
<REALIZED-GAINS-CURRENT>                    15,173,182
<APPREC-INCREASE-CURRENT>                   63,095,779
<NET-CHANGE-FROM-OPS>                       88,275,506
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    9,914,239
<DISTRIBUTIONS-OF-GAINS>                    10,172,978
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     10,428,037
<NUMBER-OF-SHARES-REDEEMED>                 11,168,365
<SHARES-REINVESTED>                          1,500,824
<NET-CHANGE-IN-ASSETS>                      76,537,068
<ACCUMULATED-NII-PRIOR>                         99,330
<ACCUMULATED-GAINS-PRIOR>                      (33,140)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,298,488
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,738,444
<AVERAGE-NET-ASSETS>                       417,503,927
<PER-SHARE-NAV-BEGIN>                            11.44
<PER-SHARE-NII>                                   0.31
<PER-SHARE-GAIN-APPREC>                           2.29
<PER-SHARE-DIVIDEND>                             (0.30)
<PER-SHARE-DISTRIBUTIONS>                        (0.31)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              13.43
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      456,772,419
<INVESTMENTS-AT-VALUE>                     542,867,778
<RECEIVABLES>                               21,887,135
<ASSETS-OTHER>                                   1,546
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             564,756,459
<PAYABLE-FOR-SECURITIES>                        87,044
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      983,567
<TOTAL-LIABILITIES>                          1,070,611
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   475,645,805
<SHARES-COMMON-STOCK>                           10,838
<SHARES-COMMON-PRIOR>                           15,043
<ACCUMULATED-NII-CURRENT>                       26,102
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,920,993
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    86,092,948
<NET-ASSETS>                                   133,821
<DIVIDEND-INCOME>                                6,053
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   2,290
<NET-INVESTMENT-INCOME>                          3,763
<REALIZED-GAINS-CURRENT>                         2,360
<APPREC-INCREASE-CURRENT>                        9,196
<NET-CHANGE-FROM-OPS>                           15,319
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        3,204
<DISTRIBUTIONS-OF-GAINS>                         1,969
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            931
<NUMBER-OF-SHARES-REDEEMED>                      5,552
<SHARES-REINVESTED>                                416
<NET-CHANGE-IN-ASSETS>                         (39,222)
<ACCUMULATED-NII-PRIOR>                        179,574
<ACCUMULATED-GAINS-PRIOR>                      877,322
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,271,174
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,789,789
<AVERAGE-NET-ASSETS>                           139,036
<PER-SHARE-NAV-BEGIN>                            11.50
<PER-SHARE-NII>                                   0.34
<PER-SHARE-GAIN-APPREC>                           1.01
<PER-SHARE-DIVIDEND>                             (0.31)
<PER-SHARE-DISTRIBUTIONS>                        (0.19)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              12.35
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      456,772,419
<INVESTMENTS-AT-VALUE>                     542,867,778
<RECEIVABLES>                               21,887,135
<ASSETS-OTHER>                                   1,546
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             564,756,459
<PAYABLE-FOR-SECURITIES>                        87,044
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      983,567
<TOTAL-LIABILITIES>                          1,070,611
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   475,645,805
<SHARES-COMMON-STOCK>                           10,948
<SHARES-COMMON-PRIOR>                           10,464
<ACCUMULATED-NII-CURRENT>                       26,102
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,920,993
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    86,092,948
<NET-ASSETS>                                   135,418
<DIVIDEND-INCOME>                                5,519
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,394
<NET-INVESTMENT-INCOME>                          4,125
<REALIZED-GAINS-CURRENT>                         2,230
<APPREC-INCREASE-CURRENT>                        8,395
<NET-CHANGE-FROM-OPS>                           14,750
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        4,068
<DISTRIBUTIONS-OF-GAINS>                         1,970
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                484
<NET-CHANGE-IN-ASSETS>                          14,750
<ACCUMULATED-NII-PRIOR>                        179,574
<ACCUMULATED-GAINS-PRIOR>                      877,322
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,271,174
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,789,789
<AVERAGE-NET-ASSETS>                           127,006
<PER-SHARE-NAV-BEGIN>                            11.53
<PER-SHARE-NII>                                   0.39
<PER-SHARE-GAIN-APPREC>                           1.03
<PER-SHARE-DIVIDEND>                             (0.39)
<PER-SHARE-DISTRIBUTIONS>                        (0.19)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              12.37
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      456,772,419
<INVESTMENTS-AT-VALUE>                     542,867,778
<RECEIVABLES>                               21,887,135
<ASSETS-OTHER>                                   1,546
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             564,756,459
<PAYABLE-FOR-SECURITIES>                        87,044
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      983,567
<TOTAL-LIABILITIES>                          1,070,611
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   475,645,805
<SHARES-COMMON-STOCK>                           10,994
<SHARES-COMMON-PRIOR>                           10,473
<ACCUMULATED-NII-CURRENT>                       26,102
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,920,993
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    86,092,948
<NET-ASSETS>                                   136,218
<DIVIDEND-INCOME>                                5,542
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     956
<NET-INVESTMENT-INCOME>                          4,586
<REALIZED-GAINS-CURRENT>                         2,239
<APPREC-INCREASE-CURRENT>                        8,433
<NET-CHANGE-FROM-OPS>                           15,258
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        4,538
<DISTRIBUTIONS-OF-GAINS>                         1,972
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                521
<NET-CHANGE-IN-ASSETS>                          15,258
<ACCUMULATED-NII-PRIOR>                        179,574
<ACCUMULATED-GAINS-PRIOR>                      877,322
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,271,174
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,789,789
<AVERAGE-NET-ASSETS>                           127,536
<PER-SHARE-NAV-BEGIN>                            11.55
<PER-SHARE-NII>                                   0.44
<PER-SHARE-GAIN-APPREC>                           1.02
<PER-SHARE-DIVIDEND>                             (0.43)
<PER-SHARE-DISTRIBUTIONS>                        (0.19)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              12.39
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      456,772,419
<INVESTMENTS-AT-VALUE>                     542,867,778
<RECEIVABLES>                               21,887,135
<ASSETS-OTHER>                                   1,546
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             564,756,459
<PAYABLE-FOR-SECURITIES>                        87,044
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      983,567
<TOTAL-LIABILITIES>                          1,070,611
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   475,645,805
<SHARES-COMMON-STOCK>                       45,632,444
<SHARES-COMMON-PRIOR>                       39,690,301
<ACCUMULATED-NII-CURRENT>                       26,102
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,920,993
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    86,092,948
<NET-ASSETS>                               563,280,391
<DIVIDEND-INCOME>                           21,917,233
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               2,582,078
<NET-INVESTMENT-INCOME>                     19,335,155
<REALIZED-GAINS-CURRENT>                     8,878,977
<APPREC-INCREASE-CURRENT>                   33,082,821
<NET-CHANGE-FROM-OPS>                       61,296,953
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   19,441,756
<DISTRIBUTIONS-OF-GAINS>                     7,883,759
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     16,529,257
<NUMBER-OF-SHARES-REDEEMED>                 12,780,860
<SHARES-REINVESTED>                          2,193,746
<NET-CHANGE-IN-ASSETS>                     106,507,531
<ACCUMULATED-NII-PRIOR>                        179,574
<ACCUMULATED-GAINS-PRIOR>                      877,322
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,271,174
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,789,789
<AVERAGE-NET-ASSETS>                       504,311,686
<PER-SHARE-NAV-BEGIN>                            11.51
<PER-SHARE-NII>                                   0.46
<PER-SHARE-GAIN-APPREC>                           1.02
<PER-SHARE-DIVIDEND>                             (0.46)
<PER-SHARE-DISTRIBUTIONS>                        (0.19)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              12.34
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      309,944,622
<INVESTMENTS-AT-VALUE>                     357,237,341
<RECEIVABLES>                                3,209,507
<ASSETS-OTHER>                               4,987,097
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             365,433,945
<PAYABLE-FOR-SECURITIES>                     6,371,010
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,411,123
<TOTAL-LIABILITIES>                          8,782,133
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   320,990,580
<SHARES-COMMON-STOCK>                           10,176
<SHARES-COMMON-PRIOR>                           11,708
<ACCUMULATED-NII-CURRENT>                      113,978
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (12,355,482)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    47,902,736
<NET-ASSETS>                                   112,681
<DIVIDEND-INCOME>                                1,921
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   2,524
<NET-INVESTMENT-INCOME>                           (603)
<REALIZED-GAINS-CURRENT>                         4,628
<APPREC-INCREASE-CURRENT>                       11,747
<NET-CHANGE-FROM-OPS>                           15,772
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        1,057
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          5,377
<NUMBER-OF-SHARES-REDEEMED>                      7,009
<SHARES-REINVESTED>                                100
<NET-CHANGE-IN-ASSETS>                           1,038
<ACCUMULATED-NII-PRIOR>                       (215,389)
<ACCUMULATED-GAINS-PRIOR>                  (17,063,339)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,398,114
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,051,454
<AVERAGE-NET-ASSETS>                           117,494
<PER-SHARE-NAV-BEGIN>                             9.54
<PER-SHARE-NII>                                  (0.07)
<PER-SHARE-GAIN-APPREC>                           1.70
<PER-SHARE-DIVIDEND>                             (0.10)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              11.07
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      309,944,622
<INVESTMENTS-AT-VALUE>                     357,237,341
<RECEIVABLES>                                3,209,507
<ASSETS-OTHER>                               4,987,097
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             365,433,945
<PAYABLE-FOR-SECURITIES>                     6,371,010
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,411,123
<TOTAL-LIABILITIES>                          8,782,133
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   320,990,580
<SHARES-COMMON-STOCK>                           10,281
<SHARES-COMMON-PRIOR>                           10,120
<ACCUMULATED-NII-CURRENT>                      113,978
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (12,355,482)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    47,902,736
<NET-ASSETS>                                   114,019
<DIVIDEND-INCOME>                                1,684
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,668
<NET-INVESTMENT-INCOME>                             16
<REALIZED-GAINS-CURRENT>                         4,134
<APPREC-INCREASE-CURRENT>                       13,151
<NET-CHANGE-FROM-OPS>                           17,301
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        1,741
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                161
<NET-CHANGE-IN-ASSETS>                          17,250
<ACCUMULATED-NII-PRIOR>                       (215,389)
<ACCUMULATED-GAINS-PRIOR>                  (17,063,339)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,398,114
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,051,454
<AVERAGE-NET-ASSETS>                           104,334
<PER-SHARE-NAV-BEGIN>                             9.56
<PER-SHARE-NII>                                   0.00
<PER-SHARE-GAIN-APPREC>                           1.70
<PER-SHARE-DIVIDEND>                             (0.17)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              11.09
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      309,944,622
<INVESTMENTS-AT-VALUE>                     357,237,341
<RECEIVABLES>                                3,209,507
<ASSETS-OTHER>                               4,987,097
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             365,433,945
<PAYABLE-FOR-SECURITIES>                     6,371,010
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,411,123
<TOTAL-LIABILITIES>                          8,782,133
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   320,990,580
<SHARES-COMMON-STOCK>                           10,315
<SHARES-COMMON-PRIOR>                           10,129
<ACCUMULATED-NII-CURRENT>                      113,978
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (12,355,482)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    47,902,736
<NET-ASSETS>                                   114,468
<DIVIDEND-INCOME>                                1,688
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,410
<NET-INVESTMENT-INCOME>                            278
<REALIZED-GAINS-CURRENT>                         4,144
<APPREC-INCREASE-CURRENT>                       12,486
<NET-CHANGE-FROM-OPS>                           16,908
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        2,014
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                186
<NET-CHANGE-IN-ASSETS>                          17,560
<ACCUMULATED-NII-PRIOR>                       (215,389)
<ACCUMULATED-GAINS-PRIOR>                  (17,063,339)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,398,114
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,051,454
<AVERAGE-NET-ASSETS>                           104,615
<PER-SHARE-NAV-BEGIN>                             9.57
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                           1.70
<PER-SHARE-DIVIDEND>                             (0.20)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              11.10
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      309,944,622
<INVESTMENTS-AT-VALUE>                     357,237,341
<RECEIVABLES>                                3,209,507
<ASSETS-OTHER>                               4,987,097
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             365,433,945
<PAYABLE-FOR-SECURITIES>                     6,371,010
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    2,411,123
<TOTAL-LIABILITIES>                          8,782,133
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   320,990,580
<SHARES-COMMON-STOCK>                       32,070,618
<SHARES-COMMON-PRIOR>                       23,044,249
<ACCUMULATED-NII-CURRENT>                      113,978
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (12,355,482)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    47,902,736
<NET-ASSETS>                               356,310,644
<DIVIDEND-INCOME>                            4,500,395
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               2,849,083
<NET-INVESTMENT-INCOME>                      1,651,312
<REALIZED-GAINS-CURRENT>                    10,719,446
<APPREC-INCREASE-CURRENT>                   36,493,290
<NET-CHANGE-FROM-OPS>                       48,864,048
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    7,341,319
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     14,964,804
<NUMBER-OF-SHARES-REDEEMED>                  6,611,341
<SHARES-REINVESTED>                            672,906
<NET-CHANGE-IN-ASSETS>                     135,592,376
<ACCUMULATED-NII-PRIOR>                       (215,389)
<ACCUMULATED-GAINS-PRIOR>                  (17,063,339)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        2,398,114
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,051,454
<AVERAGE-NET-ASSETS>                       281,804,600
<PER-SHARE-NAV-BEGIN>                             9.58
<PER-SHARE-NII>                                   0.06
<PER-SHARE-GAIN-APPREC>                           1.71
<PER-SHARE-DIVIDEND>                             (0.24)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              11.11
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      142,542,031
<INVESTMENTS-AT-VALUE>                     143,559,760
<RECEIVABLES>                                2,357,708
<ASSETS-OTHER>                                   1,576
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             145,919,044
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      385,635
<TOTAL-LIABILITIES>                            385,635
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   144,792,097
<SHARES-COMMON-STOCK>                           11,415
<SHARES-COMMON-PRIOR>                           10,896
<ACCUMULATED-NII-CURRENT>                       18,783
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (295,200)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,017,729
<NET-ASSETS>                                   115,863
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                7,341
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,858
<NET-INVESTMENT-INCOME>                          5,483
<REALIZED-GAINS-CURRENT>                          (222)
<APPREC-INCREASE-CURRENT>                         (387)
<NET-CHANGE-FROM-OPS>                            4,874
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        5,226
<DISTRIBUTIONS-OF-GAINS>                            59
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                519
<NET-CHANGE-IN-ASSETS>                           4,874
<ACCUMULATED-NII-PRIOR>                         68,862
<ACCUMULATED-GAINS-PRIOR>                       71,465
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          606,206
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                749,145
<AVERAGE-NET-ASSETS>                           112,826
<PER-SHARE-NAV-BEGIN>                            10.19
<PER-SHARE-NII>                                   0.50
<PER-SHARE-GAIN-APPREC>                          (0.05)
<PER-SHARE-DIVIDEND>                             (0.48)
<PER-SHARE-DISTRIBUTIONS>                        (0.01)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.15
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      142,542,031
<INVESTMENTS-AT-VALUE>                     143,559,760
<RECEIVABLES>                                2,357,708
<ASSETS-OTHER>                                   1,576
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             145,919,044
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      385,635
<TOTAL-LIABILITIES>                            385,635
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   144,792,097
<SHARES-COMMON-STOCK>                           11,544
<SHARES-COMMON-PRIOR>                           10,960
<ACCUMULATED-NII-CURRENT>                       18,783
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (295,200)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,017,729
<NET-ASSETS>                                   117,250
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                7,409
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   1,249
<NET-INVESTMENT-INCOME>                          6,160
<REALIZED-GAINS-CURRENT>                          (224)
<APPREC-INCREASE-CURRENT>                         (388)
<NET-CHANGE-FROM-OPS>                            5,548
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        5,892
<DISTRIBUTIONS-OF-GAINS>                            59
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                584
<NET-CHANGE-IN-ASSETS>                           5,548
<ACCUMULATED-NII-PRIOR>                         68,862
<ACCUMULATED-GAINS-PRIOR>                       71,465
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          606,206
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                749,145
<AVERAGE-NET-ASSETS>                           113,863
<PER-SHARE-NAV-BEGIN>                            10.19
<PER-SHARE-NII>                                   0.56
<PER-SHARE-GAIN-APPREC>                          (0.04)
<PER-SHARE-DIVIDEND>                             (0.54)
<PER-SHARE-DISTRIBUTIONS>                        (0.01)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.16
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      142,542,031
<INVESTMENTS-AT-VALUE>                     143,559,760
<RECEIVABLES>                                2,357,708
<ASSETS-OTHER>                                   1,576
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             145,919,044
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      385,635
<TOTAL-LIABILITIES>                            385,635
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   144,792,097
<SHARES-COMMON-STOCK>                           11,599
<SHARES-COMMON-PRIOR>                           10,974
<ACCUMULATED-NII-CURRENT>                       18,783
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (295,200)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,017,729
<NET-ASSETS>                                   118,001
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                7,444
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     858
<NET-INVESTMENT-INCOME>                          6,586
<REALIZED-GAINS-CURRENT>                          (225)
<APPREC-INCREASE-CURRENT>                         (387)
<NET-CHANGE-FROM-OPS>                            5,974
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        6,322
<DISTRIBUTIONS-OF-GAINS>                            59
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                625
<NET-CHANGE-IN-ASSETS>                           5,974
<ACCUMULATED-NII-PRIOR>                         68,862
<ACCUMULATED-GAINS-PRIOR>                       71,465
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          606,206
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                749,145
<AVERAGE-NET-ASSETS>                           114,393
<PER-SHARE-NAV-BEGIN>                            10.21
<PER-SHARE-NII>                                   0.60
<PER-SHARE-GAIN-APPREC>                          (0.05)
<PER-SHARE-DIVIDEND>                             (0.58)
<PER-SHARE-DISTRIBUTIONS>                        (0.01)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.17
<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 year ended December 31, 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>                           12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<INVESTMENTS-AT-COST>                      142,542,031
<INVESTMENTS-AT-VALUE>                     143,559,760
<RECEIVABLES>                                2,357,708
<ASSETS-OTHER>                                   1,576
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             145,919,044
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      385,635
<TOTAL-LIABILITIES>                            385,635
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   144,792,097
<SHARES-COMMON-STOCK>                       14,365,202
<SHARES-COMMON-PRIOR>                       12,113,356
<ACCUMULATED-NII-CURRENT>                       18,783
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (295,200)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,017,729
<NET-ASSETS>                               145,182,295
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            8,760,981
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 697,389
<NET-INVESTMENT-INCOME>                      8,063,592
<REALIZED-GAINS-CURRENT>                      (274,174)
<APPREC-INCREASE-CURRENT>                     (383,540)
<NET-CHANGE-FROM-OPS>                        7,405,878
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    8,134,815
<DISTRIBUTIONS-OF-GAINS>                        71,288
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      6,074,656
<NUMBER-OF-SHARES-REDEEMED>                  4,631,745
<SHARES-REINVESTED>                            808,935
<NET-CHANGE-IN-ASSETS>                      22,278,139
<ACCUMULATED-NII-PRIOR>                         68,862
<ACCUMULATED-GAINS-PRIOR>                       71,465
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          606,206
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                749,145
<AVERAGE-NET-ASSETS>                       134,371,356
<PER-SHARE-NAV-BEGIN>                            10.15
<PER-SHARE-NII>                                   0.60
<PER-SHARE-GAIN-APPREC>                          (0.03)
<PER-SHARE-DIVIDEND>                             (0.60)
<PER-SHARE-DISTRIBUTIONS>                        (0.01)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.11
<EXPENSE-RATIO>                                   0.52
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        

</TABLE>

                           EXHIBIT INDEX TO FORM N-SAR


Exhibit No.                                 Description


   77B         Accountant's Report on Internal Control

      77C         Submission of Matters to a Vote of Security Holders

      77Q(e)      Investment Sub-Advisory Agreement, effective January 1, 1997,
                  between Massachusetts Mutual Life Insurance Company and David
                  L. Babson and Company Incorporated regarding MassMutual Value
                  Equity Fund, MassMutual Small Cap Value Equity Fund, and the
                  Value Equity Sector of MassMutual Balanced Fund









                        REPORT OF INDEPENDENT ACCOUNTANTS



To the Board of Trustees and Shareholders of the MassMutual Institutional Funds:

In planning and performing our audits of the financial  statements and financial
highlights of the  MassMutual  Institutional  Funds (the  "Trust"),  comprising,
respectively,  the Prime,  Short-Term Bond, Core Bond,  Balanced,  Value Equity,
Small Cap Value  Equity,  and  International  Equity  Funds,  for the year ended
December 31, 1996,  we  considered  its internal  control  structure,  including
procedures  for  safeguarding  securities,  in order to  determine  our auditing
procedures for the purpose of expressing our opinion on the financial statements
and financial  highlights and to comply with the requirements of Form N-SAR, not
to provide assurance on the internal control structure.

The management of the Trust is responsible for  establishing  and maintaining an
internal control  structure.  In fulfilling this  responsibility,  estimates and
judgments by management are required to assess the expected benefits and related
costs  of  internal  control  structure  policies  and  procedures.  Two  of the
objectives  of an internal  control  structure  are to provide  management  with
reasonable, but not absolute, assurance that assets are safeguarded against loss
from  unauthorized  use or  disposition  and that  transactions  are executed in
accordance  with  management's  authorization  and  recorded  properly to permit
preparation  of financial  statements  in  conformity  with  generally  accepted
accounting principles.

Because of inherent  limitations in any internal  control  structure,  errors or
irregularities may occur and not be detected. Also, projection of any evaluation
of the  structure  to future  periods  is subject to the risk that it may become
inadequate  because of changes in  conditions or that the  effectiveness  of the
design and operation may deteriorate.

Our  consideration  of the  internal  control  structure  would not  necessarily
disclose all matters in the internal  control  structure  that might be material
weaknesses  under standards  established by the American  Institute of Certified
Public  Accountants.  A material  weakness is a condition in which the design or
operation of the specific internal control structure elements does not reduce to
a relatively  low level the risk that errors or  irregularities  in amounts that
would  be  material  in  relation  to the  financial  statements  and  financial
highlights being audited may occur and not be detected within a timely period by
employees in the normal course of performing their assigned functions.  However,
we  noted  no  matters  involving  the  internal  control  structure,  including
procedures  for  safeguarding  securities,  that  we  consider  to  be  material
weaknesses, as defined above, as of December 31, 1996.

This report is intended  solely for the information and use of management of the
Trust and the Securities and Exchange Commission.


/S/ Coopers & Lybrand L.L.P.

Springfield, Massachusetts
February 14, 1997




For Period Ended 12/31/96
File No. 811-8274


Item 77C.   Submission of Matters to a Vote of Security Holders


      At the special meeting held on October 16, 1996, Registrant's shareholders
voted on certain matters described in the proxy solicitation materials that were
furnished  to  contract  holders  and filed  with the  Securities  and  Exchange
Commission by letter dated September 26, 1996.

      These  matters  included  the  following  proposals:  (i) to  approve  new
investment  sub-advisory  agreements between Massachusetts Mutual Life Insurance
Company  ("MassMutual")  and David L. Babson and Company  Incorporated;  (ii) to
elect six  Trustees;  and (iii) to ratify the  selection of Coopers & Lybrand as
independent accountants for the fiscal year ending December 31, 1996.

      All  of the  above-listed  proposals  were  approved  by the  shareholders
according to the attached  voting  certificate  which sets forth the vote totals
for each proposal.

      Richard H. Ayers, David E.A. Carson, Richard G. Dooley, Richard W. Greene,
Beverly C.L. Hamilton, and F.William Marshall, Jr. were elected as Trustees at 
the special shareholder meeting.  Gary E. Wendlandt, Ronald J. Abdow, Mary E. 
Boland, Charles J. McCarthy, John V. Murphy and John H. Southworth are the other
Trustees as of the date hereof.














                  MASSMUTUAL INSTITUTIONAL FUNDS: VOTING CERTIFICATE


                  October 16, 1996 Special Meeting of Shareholders

- ------------------ --------------- ----------------- -----------------
                   Prime Fund      Short-Term Bond   Core Bond Fund    
                                   Fund                                 
                                                                        
- ------------------ --------------- ----------------- ----------------- 
Number of Shares   1,535,470.40    13,343,403.33     30,752,701.81    
as of the Record
Date
- ------------------ --------------- ----------------- ----------------- 
- ------------------ --------------- ----------------- ----------------- 
Shares Present     1,535,470.40    13,343,403.33     30,752,291.054   
in Person or by
Proxy
- ------------------ --------------- ----------------- -----------------


- ------------------ ----------------- ----------------- ---------------
                   Balanced Fund    Value Equity     Small Cap        
                                    Fund             Value Equity     
                                                                      
- ------------------ --------------- ----------------- -----------------
Number of Shares   41,884,702.61    167,208,460.54   34,223,488.57    
as of the Record
Date
- ------------------ --------------- ----------------- -----------------
- ------------------ --------------- ----------------- -----------------
Shares Present     41,884,435.157   167,208,460.54   34,221,947.778   
in Person or by
Proxy
- ------------------ -----------------

- ------------------ -----------------
                   International
                   Equity Fund
                   
- ------------------ -----------------
Number of Shares   28,994,142.01
as of the Record
Date
- ------------------ -----------------
- ------------------ -----------------
Shares Present     28,991,582.828
in Person or by
Proxy
- ------------------ -----------------

Proposal 1 - Approval of Investment Sub-Advisory Agreement to be entered into 
between Massachusetts Mutual Life Insurance Company and David L. Babson & 
Company, as described in the Proxy Statement.

- ------------------ --------------- ----------------- -----------------
                   Prime Fund      Short-Term Bond   Core Bond Fund   
                                   Fund                               
                                                                      
- ------------------ --------------- ----------------- -----------------
- ------------------ --------------- ----------------- -----------------
Shares Voted For   N/A             N/A               N/A              
- ------------------ --------------- ----------------- -----------------
- ------------------ --------------- ----------------- -----------------
Shares Voted       N/A             N/A               N/A              
Against or
Abstain
- ------------------ --------------- ----------------- -----------------
- ------------------ --------------- ----------------- -----------------
% Voted For        N/A             N/A               N/A              
- ------------------ --------------- ----------------- -----------------


- ------------------ ---------------- ---------------- ---------------- 
                   Balanced Fund    Value Equity     Small Cap        
                                     Fund             Value Equity    
                                                     Fund
- ------------------ ---------------- ---------------- ---------------- 
- ------------------ ---------------- ---------------- ---------------- 
Shares Voted For   41,884,435.157   167,208,460.54   34,221,947.778   
- ------------------ ---------------- ---------------- ---------------- 
- ------------------ ---------------- ---------------- ---------------- 
Shares Voted        0                0                0               
Against or
Abstain
- ------------------ ---------------- ---------------- ---------------- 
- ------------------ ---------------- ---------------- ---------------- 
% Voted For         99.99%           100%             99.99%          
- ------------------ ---------------- ---------------- ---------------- 


- ------------------ -----------------
                   International
                   Equity Fund
                   Fund
- ------------------ -----------------
- ------------------ -----------------
Shares Voted For   N/A
- ------------------ -----------------
- ------------------ -----------------
Shares Voted       N/A
Against or
Abstain
- ------------------ -----------------
- ------------------ -----------------
% Voted For        N/A
- ------------------ -----------------

Proposal 2 - Election of Richard H. Ayers, David E. A. Carson, Richard G. 
Dooley, Richard W. Greene, Beverly C. L. Hamilton, and F. William Marshall, Jr.
as members of the Board of Trustees, each for an indefinite term.

- ------------------ --------------- ----------------- ---------------
                   Prime Fund      Short-Term Bond   Core Bond Fund 
                                   Fund                             
- ------------------ --------------- ----------------- ---------------
- ------------------ --------------- ----------------- ---------------
Shares Voted For   1,535,470.40    13,343,403.33     30,752,291.054 
All Nominees
- ------------------ --------------- ----------------- ---------------
- ------------------ --------------- ----------------- ---------------
Shares Voted       0               0                 0              
Against or
Abstain
- ------------------ --------------- ----------------- --------------- 
- ------------------ --------------- ----------------- --------------- 
% Voted For        100%            100%              99.99%          
- ------------------ --------------- ----------------- --------------- 

- ------------------ ----------------- ---------------- ----------------- 
                   Balanced Fund     Value Equity     Small Cap Value   
                                     Fund             Equity Fund       
- ------------------ ----------------- ---------------- ----------------- 
- ------------------ ----------------- ---------------- ----------------- 
Shares Voted For   41,884,435.157    167,208,460.54   34,221,947.778    
All Nominees
- ------------------ ----------------- ---------------- ----------------- 
- ------------------ ----------------- ---------------- ----------------- 
Shares Voted                       0                0                 0
Against or
Abstain
- ------------------ ----------------- ---------------- ----------------- 
- ------------------ ----------------- ---------------- ----------------- 
% Voted For        99.99%            100%             99.99%            
- ------------------ ----------------- ---------------- ----------------- 

- ------------------ -----------------
                   International
                   Equity Fund
- ------------------ -----------------
- ------------------ -----------------
Shares Voted For   28,991,582.828
All Nominees
- ------------------ -----------------
- ------------------ -----------------
Shares Voted       0
Against or
Abstain
- ------------------ -----------------
- ------------------ -----------------
% Voted For        99.99%
- ------------------ -----------------


Proposal 3 - Ratification of the selection of Coopers & Lybrand L.L.P. as 
independent auditors and accountants of the Trust for the fiscal year ending 
December 31, 1996.

- ------------------ -------------- ---------------- ----------------- 
                   Prime Fund     Short-Term       Core Bond Fund    
                                  Bond Fund                          
- ------------------ -------------- ---------------- ----------------- 
- ------------------ -------------- ---------------- ----------------- 
Shares Voted For   1,535,470.40   13,343,403.33    30,752,291.054    
- ------------------ -------------- ---------------- ----------------- 
- ------------------ -------------- ---------------- ----------------- 
Shares Voted       0              0                0                 
Against or
Abstain
- ------------------ -------------- ---------------- ----------------- 
- ------------------ -------------- ---------------- ----------------- 
% Voted For        100%           100%             99.99%            
- ------------------ -------------- ---------------- ----------------- 


- ------------------ ---------------- ---------------- ----------------- 
                   Balanced Fund    Value Equity     Small Cap Value   
                                    Fund             Equity Fund       
- ------------------ ---------------- ---------------- ----------------- 
- ------------------ ---------------- ---------------- ----------------- 
Shares Voted For   41,884,435.157   167,208,460.54   34,221,947.778    
- ------------------ ---------------- ---------------- ----------------- 
- ------------------ ---------------- ---------------- ----------------- 
Shares Voted                      0                0                 0
Against or
Abstain
- ------------------ ---------------- ---------------- ----------------- 
- ------------------ ---------------- ---------------- ----------------- 
% Voted For        99.99%           100%             99.99%            
- ------------------ ---------------- ---------------- ----------------- 

- ------------------ ------------------
                   International
                   Equity Fund
- ------------------ ------------------
- ------------------ ------------------
Shares Voted For   28,991,582.828
- ------------------ ------------------
- ------------------ ------------------
Shares Voted       0
Against or
Abstain
- ------------------ ------------------
- ------------------ ------------------
% Voted For        99.99%
- ------------------ ------------------


                                                 John E. Deitelbaum
                                                 Election Inspector



                        INVESTMENT SUB-ADVISORY AGREEMENT



                                     Between




                   MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY



                                       And




                    DAVID L. BABSON AND COMPANY INCORPORATED



                 (With respect to MassMutual Value Equity Fund)


<PAGE>





                        INVESTMENT SUB-ADVISORY AGREEMENT


         This INVESTMENT SUB-ADVISORY AGREEMENT (the "Sub-Advisory  Agreement"),
is by and between David L. Babson and Company Incorporated,  organized under the
laws of the Commonwealth of Massachusetts (the "Sub-Adviser"), and Massachusetts
Mutual Life  Insurance  Company,  a  Massachusetts  corporation  ("MassMutual"),
effective this 1st day of January, 1997.

         WHEREAS,  the MassMutual  Value Equity Fund (the "Fund") is a series of
MassMutual  Institutional  Funds (the "Trust"),  a Massachusetts  business trust
which is an open-end  diversified  management  investment  company registered as
such with the Securities and Exchange Commission (the "Commission")  pursuant to
the  Investment  Company Act of 1940, as amended (the "Act"),  and the Trust has
appointed  MassMutual  as the  investment  adviser for the Fund  pursuant to the
terms of an Investment Advisory Agreement (the "Advisory Agreement");

         WHEREAS,  the Advisory  Agreement  provides that MassMutual may, at its
option,  subject to  approval  by the  Trustees  of the Trust and, to the extent
necessary,  shareholders  of the Fund,  appoint a sub-adviser  to assume certain
responsibilities and obligations of MassMutual under the Advisory Agreement;

         WHEREAS,   MassMutual  and  the  Sub-Adviser  are  investment  advisers
registered  with the  Commission  as such under the  Investment  Advisers Act of
1940, as amended (the "Advisers Act"); and

         WHEREAS,   MassMutual   desires  to  appoint  the  Sub-Adviser  as  its
sub-adviser  for the Fund and the Sub-Adviser is willing to act in such capacity
upon the terms herein set forth;

         NOW  THEREFORE,  in  consideration  of the  premises  and of the mutual
covenants herein contained,  MassMutual and the Sub-Adviser, the parties hereto,
intending to be legally bound, hereby agree as follows:

1.       General Provision.

         MassMutual  hereby employs the Sub-Adviser  and the Sub-Adviser  hereby
         undertakes to act as the investment  sub-adviser of the Fund to provide
         investment  advice  and to perform  for the Fund such other  duties and
         functions as are hereinafter set forth.  The Sub-Adviser  shall, in all
         matters,  give to the Fund and the Trust's Board of Trustees,  directly
         or through MassMutual,  the benefit of the Sub-Adviser's best judgment,
         effort,  advice and recommendations and shall, at all times conform to,
         and use its best efforts to enable the Fund to conform to:

         (a) the provisions of the Act and any rules or regulations thereunder;

         (b) any other applicable provisions of state or federal law;

         (c) the provisions of the Agreement and Declaration of Trust and Bylaws
             of the Trust, as amended from time to time (collectively referred 
             to as the "Trust Documents");

         (d) policies and determinations of the Board of Trustees of the Trust 
             and MassMutual;

         (e) the fundamental and non-fundamental policies and investment
             restrictions of the Fund as reflected in the Trust's registration
             statement under the Investment Company Act or as such policies may,
             from time to time, be amended by the Fund's shareholders; and

         (f) the Prospectus and Statement of Additional Information of the Fund
             in effect from time to time.

         The  appropriate  officers and  employees of the  Sub-Adviser  shall be
         available  upon  reasonable  notice  for  consultation  with any of the
         Trustees and officers of the Trust and  MassMutual  with respect to any
         matter  dealing with the business and affairs of the Fund,  such as the
         valuation  of  portfolio  securities  of the  Fund,  including  but not
         limited to securities that are either not registered for public sale or
         securities not traded on any securities market.

2.       Duties of the Sub-Adviser.

         (a)      The Sub-Adviser shall, subject to the direction and control by
                  the  Trust's Board of Trustees or MassMutual, to the extent 
                  MassMutual's direction is not inconsistent  with that of the 
                  Board of Trustees, (i) regularly provide investment advice and
                  recommendations  to the Fund, directly or through MassMutual, 
                  with respect to the Fund's  investments, investment policies
                  and he purchase and  sale of securities; (ii) supervise  and 
                  monitor  continuously the  investment program of the  Fund and
                  the composition of its portfolio and determine what securities
                  shall be purchased or sold by the Fund; (iii) arrange, subject
                  to the provisions of Section 5 hereof, for the  purchase  of
                  securities and other investments for the Fund and the sale of
                  securities and other investments held in the portfolio of the
                  Fund; and (iv) provide reports on the  foregoing to the Board 
                  of Trustees at each Board meeting. 

         (b)      Provided that none of MassMutual,  the Fund or the Trust shall
                  be required to pay any compensation other than as provided by
                  the terms of this  Sub-Advisory  Agreement  and subject to the
                  provisions  of Section 5 hereof,  the  Sub-Adviser  may obtain
                  investment information,  research or assistance from any other
                  person, firm or corporation to supplement, update or otherwise
                  improve its investment management services.

         (c)      Provided  that  nothing  herein shall be deemed to protect the
                  Sub-Adviser  from  willful  misfeasance,  bad  faith  or gross
                  negligence  in the  performance  of its  duties,  or  reckless
                  disregard   to  its   obligations   and   duties   under  this
                  Sub-Advisory  Agreement,  the Sub-Adviser  shall not be liable
                  for any loss  sustained  by  reason  of good  faith  errors or
                  omissions  in  connection  with  any  matters  to  which  this
                  Sub-Advisory Agreement relates.

         (d)      Nothing  in  this   Sub-Advisory   Agreement   shall   prevent
                  MassMutual  or the  Sub-Adviser  or any officer  thereof  from
                  acting as  investment  adviser  or  sub-adviser  for any other
                  person,  firm or corporation and shall not in any way limit or
                  restrict  MassMutual  or  the  Sub-Adviser  or  any  of  their
                  respective  directors,   officers,  members,  stockholders  or
                  employees from buying,  selling, or trading any securities for
                  its own  account  or for the  account of others for whom it or
                  they may be acting,  provided  that such  activities  will not
                  adversely  affect or otherwise  impair the  performance by any
                  party of its duties and  obligations  under this  Sub-Advisory
                  Agreement.

         (e)      The  Sub-Adviser  shall cooperate with MassMutual by providing
                  MassMutual   with  any   information   in  the   Sub-Adviser's
                  possession  necessary for  supervising  the  activities of all
                  administrative  and clerical personnel as shall be required to
                  provide corporate  administration for the Fund,  including the
                  compilation  and  maintenance  of such records with respect to
                  its operations as may reasonably be required.  The Sub-Adviser
                  shall, at its own expense, provide such officers for the Trust
                  as its Board may request.

3.       Duties of MassMutual

         MassMutual shall provide the Sub-Adviser with the following information
about the Fund:

         (a)      cash flow estimates on request;

         (b)      notice of the Fund's "investable funds" by 9:00 a.m. each 
                  business day;

         (c)      as they are modified,  from time to time,  current versions of
                  the documents  and policies  referred to in  Subsections  (c),
                  (d), (e) and (f) of Section 1 hereof, above.

4.       Compensation of the Sub-Adviser.

         MassMutual agrees to pay the Sub-Adviser and the Sub-Adviser  agrees to
         accept as full  compensation  for the  performance of all functions and
         duties on its part to be performed pursuant to the provisions hereof, a
         fee paid weekly at the annual rate .13% of the average  daily net asset
         value of the  Fund,  determined  at the  close  of the New  York  Stock
         Exchange on each day that the  Exchange is open for trading and paid on
         the last day of each week.




5.       Portfolio Transactions and Brokerage.

         (a)      The  Sub-Adviser is authorized,  in arranging the purchase and
                  sale of the Fund's  publicly-traded  portfolio securities,  to
                  employ or deal  with such  members  of securities exchanges,
                  brokers or dealers (hereinafter "broker- dealers"),  including
                  "affiliated"  broker-dealers,  as that term is  defined in the
                  Act, as may, in its best judgment, implement the policy of the
                  Fund to obtain,  at  reasonable  expense,  the best  execution
                  (prompt and reliable  execution at the most favorable security
                  price obtainable) of the Fund's portfolio transactions.

         (b)      The Sub-Adviser may effect the purchase and sale of securities
                  (which are otherwise publicly traded) in private  transactions
                  on  such  terms  and  conditions  as  are  customary  in  such
                  transactions,  may  use  a  broker  in  such  to  effect  said
                  transactions,  and may  enter  into a  contract  in which  the
                  broker acts either as principal or as agent.

                   The  Sub-Adviser  shall select  broker-dealers  to effect the
                  Fund's portfolio  transactions on the basis of its estimate of
                  their  ability to obtain  best  execution  of  particular  and
                  related   portfolio   transactions.   The   abilities   of   a
                  broker-dealer to obtain best execution of particular portfolio
                  transaction(s)  will be judged by the Sub-Adviser on the basis
                  of all relevant factors and considerations including,  insofar
                  as  feasible,  the  execution  capabilities  required  by  the
                  transaction or  transactions;  the ability and  willingness of
                  the   broker-dealer   to  facilitate   the  Fund's   portfolio
                  transactions by participating therein for its own account; the
                  importance    to   the   Fund   of   speed,    efficiency   or
                  confidentiality; the broker-dealer's apparent familiarity with
                  sources  from  or  to  whom  particular  securities  might  be
                  purchased or sold;  as well as any other  matters  relevant to
                  the selection of a  broker-dealer  for  particular and related
                  transactions of the Fund.

6.       Duration.

         Unless   terminated   earlier  pursuant  to  Section  7  hereof,   this
         Sub-Advisory  Agreement  shall  remain in effect  until August 2, 1997.
         Thereafter  it shall  continue in effect from year to year,  so long as
         such  continuance  shall be approved  at least  annually by the Trust's
         Board of Trustees,  including  the vote of the majority of the Trustees
         of the Trust who are not  parties  to this  Sub-Advisory  Agreement  or
         "interested  persons" (as defined in the Act) of any such party cast in
         person at a meeting  called for the purpose of voting on such approval,
         or by the  holders  of a  "majority"  (as  defined  in the  Act) of the
         outstanding voting securities of the Fund.

7.       Termination.

         This  Sub-Advisory  Agreement  shall terminate  automatically  upon its
         assignment  or in the  event  upon  the  termination  of  the  Advisory
         Agreement; it may also be terminated: (i) for cause or with the consent
         of the parties and the Trust by  MassMutual or the  Sub-Adviser  at any
         time without penalty upon sixty days' written notice to the other party
         and the Trust;  or (ii) by the Trust at any time  without  penalty upon
         sixty days' written notice to MassMutual and the  Sub-Adviser  provided
         that such  termination  by the Trust shall be directed or approved by a
         vote of a majority  of all of the  Trustees of the Trust then in office
         or by the vote of the holders of a "majority" of the outstanding voting
         securities of the Fund (as defined in the Act).

8.       Disclaimer of Shareholder Liability.

         MassMutual and the  Sub-Adviser  understand that the obligations of the
         Trust  under  this  Sub-Advisory  Agreement  are not  binding  upon any
         Trustee or shareholder of the Trust personally, but bind only the Trust
         and the Trust's property. MassMutual and the Sub-Adviser represent that
         each has notice of the  provisions of the Trust  Documents  disclaiming
         shareholder and Trustee liability for acts or obligations of the Trust.

9.       Notice.

         Any  notice  under this  Sub-Advisory  Agreement  shall be in  writing,
         addressed and delivered or mailed, postage prepaid, to the other party,
         with a copy to the Trust,  at the addresses below or such other address
         as such other party may designate for the receipt of such notice.

                  If to MassMutual:

                           Massachusetts Mutual Life Insurance Company
                           1295 State Street
                           Springfield, MA  01111
                           Attention:  Hamline C. Wilson
                                        Senior Managing Director

                  If to the Sub-Adviser:

                           David L. Babson and Company Incorporated
                           One Memorial Drive
                           Cambridge, MA 02142
                           Attention:  John V. Murphy
                                        Chief Operating Officer

                  If to either party, copies to:

                           MassMutual Institutional Funds
                           1295 State Street
                           Springfield, MA 01111
                           Attention:  Stuart H. Reese
                                        President
                           Investors Bank & Trust
                           89 South Street
                           Boston, MA  02111
                           Attention:  Susan Mosher, Esq.


         IN WITNESS  WHEREOF,  MassMutual and the  Sub-Adviser  have caused this
Sub-Advisory Agreement to be executed on the day and year first above written.


                            MASSACHUSETTS MUTUAL LIFE
                                            INSURANCE COMPANY



                           By:  ___________________________________
                                Hamline C. Wilson
                                Senior Managing Director



                                DAVID L. BABSON AND COMPANY INCORPORATED



                            By:  ____________________________________
                                 John V. Murphy
                                 Chief Operating Officer



         Accepted and Acknowledged:


         MASSMUTUAL INSTITUTIONAL FUNDS on behalf of
         MASSMUTUAL VALUE EQUITY FUND




         By:  _____________________________________
               Stuart H. Reese
               President

<PAGE>


                        INVESTMENT SUB-ADVISORY AGREEMENT



                                     Between




                   MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY



                                       And




                    DAVID L. BABSON AND COMPANY INCORPORATED



               (With respect to MassMutual Small Cap Value Equity Fund)

<PAGE>



                        INVESTMENT SUB-ADVISORY AGREEMENT



         This INVESTMENT SUB-ADVISORY AGREEMENT (the "Sub-Advisory  Agreement"),
is by and between David L. Babson and Company Incorporated,  organized under the
laws of the Commonwealth of Massachusetts (the "Sub-Adviser"), and Massachusetts
Mutual Life  Insurance  Company,  a  Massachusetts  corporation  ("MassMutual"),
effective this 1st day of January, 1997.

         WHEREAS,  the MassMutual  Small Cap Value Equity Fund (the "Fund") is a
series of MassMutual Institutional Funds (the "Trust"), a Massachusetts business
trust which is an open-end diversified  management investment company registered
as such with the Securities and Exchange Commission (the "Commission")  pursuant
to the Investment Company Act of 1940, as amended (the "Act"), and the Trust has
appointed  MassMutual  as the  investment  adviser for the Fund  pursuant to the
terms of an Investment Advisory Agreement (the "Advisory Agreement");

         WHEREAS,  the Advisory  Agreement  provides that MassMutual may, at its
option,  subject to  approval  by the  Trustees  of the Trust and, to the extent
necessary,  shareholders  of the Fund,  appoint a sub-adviser  to assume certain
responsibilities and obligations of MassMutual under the Advisory Agreement;

         WHEREAS,   MassMutual  and  the  Sub-Adviser  are  investment  advisers
registered  with the  Commission  as such under the  Investment  Advisers Act of
1940, as amended (the "Advisers Act"); and

         WHEREAS,   MassMutual   desires  to  appoint  the  Sub-Adviser  as  its
sub-adviser  for the Fund and the Sub-Adviser is willing to act in such capacity
upon the terms herein set forth;

         NOW  THEREFORE,  in  consideration  of the  premises  and of the mutual
covenants herein contained,  MassMutual and the Sub-Adviser, the parties hereto,
intending to be legally bound, hereby agree as follows:

1.       General Provision.

         MassMutual  hereby employs the Sub-Adviser  and the Sub-Adviser  hereby
         undertakes to act as the investment  sub-adviser of the Fund to provide
         investment  advice  and to perform  for the Fund such other  duties and
         functions as are hereinafter set forth.  The Sub-Adviser  shall, in all
         matters,  give to the Fund and the Trust's Board of Trustees,  directly
         or through MassMutual,  the benefit of the Sub-Adviser's best judgment,
         effort,  advice and recommendations and shall, at all times conform to,
         and use its best efforts to enable the Fund to conform to:

     (a)  the provisions of the Act and any rules or regulations thereunder;

     (b)  any other applicable provisions of state or federal law;
         
     (c)  the  provisions  of the Agreement  and  Declaration  of Trust and
          Bylaws of the Trust,  as amended from time to time  (collectively
          referred to as the "Trust Documents");
         
     (d)  policies and determinations of the Board of Trustees of the Trust and
          MassMutual;

     (e)  the fundamental and non-fundamental  policies and investment
          restrictions of  the  Fund  as reflected  in  the  Trust's
          registration  statement under the Investment Company Act or as such 
          policies may, from time to time, be amended by the Fund's 
          shareholders; and

     (f)  the Prospectus and Statement of Additional Information of the Fund in
          effect from time to time.

         The  appropriate  officers and  employees of the  Sub-Adviser  shall be
         available  upon  reasonable  notice  for  consultation  with any of the
         Trustees and officers of the Trust and  MassMutual  with respect to any
         matter  dealing with the business and affairs of the Fund,  such as the
         valuation  of  portfolio  securities  of the  Fund,  including  but not
         limited to securities that are either not registered for public sale or
         securities not traded on any securities market.

2.       Duties of the Sub-Adviser.

         (a)      The Sub-Adviser shall, subject to the direction and control by
                  the Trust's Board of Trustees or MassMutual, to the extent
                  MassMutual's direction is not inconsistent with that of the
                  Board of Trustees, (i) regularly provide investment advice and
                  recommendations to the Fund, directly or through MassMutual, 
                  with respect to the Fund's investments, investment policies 
                  and the purchase and sale of securities; (ii) supervise and
                  monitor continuously the investment program of the Fund and 
                  the composition of its portfolio and determine what securities
                  shall be purchased or sold by the Fund; (iii) arrange, subject
                  to the provisions of Section 5 hereof, for the purchase of 
                  securities and other investments for the Fund and the sale of
                  securities and other investments held in the portfolio of the
                  Fund; and (iv) provide reports on the foregoing to the Board 
                  of Trustees at each Board meeting.

         (b)      Provided that none of MassMutual,  the Fund or the Trust shall
                  be required to pay any compensation  other than as provided by
                  the terms of this  Sub-Advisory  Agreement  and subject to the
                  provisions  of Section 5 hereof,  the  Sub-Adviser  may obtain
                  investment information,  research or assistance from any other
                  person, firm or corporation to supplement, update or otherwise
                  improve its investment management services.

         (c)      Provided  that  nothing  herein shall be deemed to protect the
                  Sub-Adviser  from  willful  misfeasance,  bad  faith  or gross
                  negligence  in the  performance  of its  duties,  or  reckless
                  disregard   to  its   obligations   and   duties   under  this
                  Sub-Advisory  Agreement,  the Sub-Adviser  shall not be liable
                  for any loss  sustained  by  reason  of good  faith  errors or
                  omissions  in  connection  with  any  matters  to  which  this
                  Sub-Advisory Agreement relates.

         (d)      Nothing  in  this   Sub-Advisory   Agreement   shall   prevent
                  MassMutual  or the  Sub-Adviser  or any officer  thereof  from
                  acting as  investment  adviser  or  sub-adviser  for any other
                  person,  firm or corporation and shall not in any way limit or
                  restrict  MassMutual  or  the  Sub-Adviser  or  any  of  their
                  respective  directors,   officers,  members,  stockholders  or
                  employees from buying,  selling, or trading any securities for
                  its own  account  or for the  account of others for whom it or
                  they may be acting,  provided  that such  activities  will not
                  adversely  affect or otherwise  impair the  performance by any
                  party of its duties and  obligations  under this  Sub-Advisory
                  Agreement.

         (e)      The  Sub-Adviser  shall cooperate with MassMutual by providing
                  MassMutual   with  any   information   in  the   Sub-Adviser's
                  possession  necessary for  supervising  the  activities of all
                  administrative  and clerical personnel as shall be required to
                  provide corporate  administration for the Fund,  including the
                  compilation  and  maintenance  of such records with respect to
                  its operations as may reasonably be required.  The Sub-Adviser
                  shall, at its own expense, provide such officers for the Trust
                  as its Board may request.

3.       Duties of MassMutual

         MassMutual shall provide the Sub-Adviser with the following information
about the Fund:

         (a)      cash flow estimates on request;

         (b)      notice of the Fund's "investable funds" by 9:00 a.m. each 
                  business day;

         (c)      as they are modified,  from time to time,  current versions of
                  the documents  and policies  referred to in  Subsections  (c),
                  (d), (e) and (f) of Section 1 hereof, above.

4.       Compensation of the Sub-Adviser.

         MassMutual agrees to pay the Sub-Adviser and the Sub-Adviser  agrees to
         accept as full  compensation  for the  performance of all functions and
         duties on its part to be performed pursuant to the provisions hereof, a
         fee paid weekly at the annual rate .25% of the average  daily net asset
         value of the  Fund,  determined  at the  close  of the New  York  Stock
         Exchange on each day that the  Exchange is open for trading and paid on
         the last day of each week.




5.       Portfolio Transactions and Brokerage.

         (a)      The  Sub-Adviser is authorized,  in arranging the purchase and
                  sale of the Fund's  publicly-traded  portfolio securities,  to
                  employ or deal  with such  members  of  securities  exchanges,
                  brokers or dealers (hereinafter "broker- dealers"),  including
                  "affiliated"  broker-dealers,  as that term is  defined in the
                  Act, as may, in its best judgment, implement the policy of the
                  Fund to obtain,  at  reasonable  expense,  the best  execution
                  (prompt and reliable  execution at the most favorable security
                  price obtainable) of the Fund's portfolio transactions.

         (b)      The Sub-Adviser may effect the purchase and sale of securities
                  (which are otherwise publicly traded) in private  transactions
                  on  such  terms  and  conditions  as  are  customary  in  such
                  transactions,  may  use  a  broker  in  such  to  effect  said
                  transactions,  and may  enter  into a  contract  in which  the
                  broker acts either as principal or as agent.

                   The  Sub-Adviser  shall select  broker-dealers  to effect the
                  Fund's portfolio  transactions on the basis of its estimate of
                  their  ability to obtain  best  execution  of  particular  and
                  related   portfolio   transactions.   The   abilities   of   a
                  broker-dealer to obtain best execution of particular portfolio
                  transaction(s)  will be judged by the Sub-Adviser on the basis
                  of all relevant factors and considerations including,  insofar
                  as  feasible,  the  execution  capabilities  required  by  the
                  transaction or  transactions;  the ability and  willingness of
                  the   broker-dealer   to  facilitate   the  Fund's   portfolio
                  transactions by participating therein for its own account; the
                  importance    to   the   Fund   of   speed,    efficiency   or
                  confidentiality; the broker-dealer's apparent familiarity with
                  sources  from  or  to  whom  particular  securities  might  be
                  purchased or sold;  as well as any other  matters  relevant to
                  the selection of a  broker-dealer  for  particular and related
                  transactions of the Fund.

6.       Duration.

         Unless   terminated   earlier  pursuant  to  Section  7  hereof,   this
         Sub-Advisory  Agreement  shall  remain in effect  until August 2, 1997.
         Thereafter  it shall  continue in effect from year to year,  so long as
         such  continuance  shall be approved  at least  annually by the Trust's
         Board of Trustees,  including  the vote of the majority of the Trustees
         of the Trust who are not  parties  to this  Sub-Advisory  Agreement  or
         "interested  persons" (as defined in the Act) of any such party cast in
         person at a meeting  called for the purpose of voting on such approval,
         or by the  holders  of a  "majority"  (as  defined  in the  Act) of the
         outstanding voting securities of the Fund.

7.       Termination.

         This  Sub-Advisory  Agreement  shall terminate  automatically  upon its
         assignment  or in the  event  upon  the  termination  of  the  Advisory
         Agreement; it may also be terminated: (i) for cause or with the consent
         of the parties and the Trust by  MassMutual or the  Sub-Adviser  at any
         time without penalty upon sixty days' written notice to the other party
         and the Trust;  or (ii) by the Trust at any time  without  penalty upon
         sixty days' written notice to MassMutual and the  Sub-Adviser  provided
         that such  termination  by the Trust shall be directed or approved by a
         vote of a majority  of all of the  Trustees of the Trust then in office
         or by the vote of the holders of a "majority" of the outstanding voting
         securities of the Fund (as defined in the Act).

8.       Disclaimer of Shareholder Liability.

         MassMutual and the  Sub-Adviser  understand that the obligations of the
         Trust  under  this  Sub-Advisory  Agreement  are not  binding  upon any
         Trustee or shareholder of the Trust personally, but bind only the Trust
         and the Trust's property. MassMutual and the Sub-Adviser represent that
         each has notice of the  provisions of the Trust  Documents  disclaiming
         shareholder and Trustee liability for acts or obligations of the Trust.

9.       Notice.

         Any  notice  under this  Sub-Advisory  Agreement  shall be in  writing,
         addressed and delivered or mailed, postage prepaid, to the other party,
         with a copy to the Trust,  at the addresses below or such other address
         as such other party may designate for the receipt of such notice.

                  If to MassMutual:

                           Massachusetts Mutual Life Insurance Company
                           1295 State Street
                           Springfield, MA  01111
                           Attention:  Hamline C. Wilson
                                        Senior Managing Director

                  If to the Sub-Adviser:

                           David L. Babson and Company Incorporated
                           One Memorial Drive
                           Cambridge, MA 02142
                           Attention:  John V. Murphy
                                        Chief Operating Officer

                  If to either party, copies to:

                           MassMutual Institutional Funds
                           1295 State Street
                           Springfield, MA 01111
                           Attention:  Stuart H. Reese
                                        President
                           Investors Bank & Trust
                           89 South Street
                           Boston, MA  02111
                           Attention:  Susan Mosher, Esq.


         IN WITNESS  WHEREOF,  MassMutual and the  Sub-Adviser  have caused this
Sub-Advisory Agreement to be executed on the day and year first above written.


                            MASSACHUSETTS MUTUAL LIFE
                                            INSURANCE COMPANY



                                By:  ___________________________________
                                Hamline C. Wilson
                                Senior Managing Directo


                               DAVID L. BABSON AND COMPANY INCORPORATED



                                By:  ____________________________________
                                John V. Murphy
                                Chief Operating Officer



         Accepted and Acknowledged:


         MASSMUTUAL INSTITUTIONAL FUNDS on behalf of
         MASSMUTUAL SMALL CAP VALUE EQUITY FUND




         By:  _____________________________________
               Stuart H. Reese
               President


<PAGE>



                        INVESTMENT SUB-ADVISORY AGREEMENT



                                     Between




                   MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY



                                       And




                    DAVID L. BABSON AND COMPANY INCORPORATED



(With respect to the Value Equity Sector of the MassMutual Balanced Fund)


<PAGE>



                        INVESTMENT SUB-ADVISORY AGREEMENT



         This INVESTMENT SUB-ADVISORY AGREEMENT (the "Sub-Advisory  Agreement"),
is by and between David L. Babson and Company Incorporated,  organized under the
laws of the Commonwealth of Massachusetts (the "Sub-Adviser"), and Massachusetts
Mutual Life  Insurance  Company,  a  Massachusetts  corporation  ("MassMutual"),
effective this 1st day of January, 1997.

         WHEREAS,  the  MassMutual  Balanced  Fund (the  "Fund")  is a series of
MassMutual  Institutional  Funds (the "Trust"),  a Massachusetts  business trust
which is an open-end  diversified  management  investment  company registered as
such with the Securities and Exchange Commission (the "Commission")  pursuant to
the  Investment  Company Act of 1940, as amended (the "Act"),  and the Trust has
appointed  MassMutual  as the  investment  adviser for the Fund,  including  the
Equity  Sector of the Fund,  pursuant  to the  terms of an  Investment  Advisory
Agreement (the "Advisory Agreement");

         WHEREAS,  the Advisory  Agreement  provides that MassMutual may, at its
option,  subject to  approval  by the  Trustees  of the Trust and, to the extent
necessary,  shareholders  of the Fund,  appoint a sub-adviser  to assume certain
responsibilities and obligations of MassMutual under the Advisory Agreement;

         WHEREAS,   MassMutual  and  the  Sub-Adviser  are  investment  advisers
registered  with the  Commission  as such under the  Investment  Advisers Act of
1940, as amended (the "Advisers Act"); and

         WHEREAS,   MassMutual   desires  to  appoint  the  Sub-Adviser  as  its
sub-adviser  for the Fund and the Sub-Adviser is willing to act in such capacity
upon the terms herein set forth;

         NOW  THEREFORE,  in  consideration  of the  premises  and of the mutual
covenants herein contained,  MassMutual and the Sub-Adviser, the parties hereto,
intending to be legally bound, hereby agree as follows:

1.       General Provision.

         MassMutual  hereby employs the Sub-Adviser  and the Sub-Adviser  hereby
         undertakes to act as the investment  sub-adviser of the Fund to provide
         investment  advice  and to perform  for the Fund such other  duties and
         functions as are hereinafter set forth.  The Sub-Adviser  shall, in all
         matters,  give to the Fund and the Trust's Board of Trustees,  directly
         or through MassMutual,  the benefit of the Sub-Adviser's best judgment,
         effort,  advice and recommendations and shall, at all times conform to,
         and use its best efforts to enable the Fund to conform to:

         (a)      the provisions of the Act and any rules or regulations 
                  thereunder;

         (b)      any other applicable provisions of state or federal law;

         (c)      the provisions of the Agreement and Declaration of Trust and
                  Bylaws of the Trust, as amended from time to time 
                 (collectively referred to as the "Trust Documents");

         (d)      policies and determinations of the Board of Trustees of the
                  Trust and MassMutual;

         (e)      the  fundamental and  non-fundamental  policies and investment
                  restrictions   of  the  Fund  as   reflected  in  the  Trust's
                  registration  statement under the Investment Company Act or as
                  such policies may, from time to time, be amended by the Fund's
                  shareholders; and

         (f)      the Prospectus and Statement of Additional Information of the
                  Fund in effect from time to time.

         The  appropriate  officers and  employees of the  Sub-Adviser  shall be
         available  upon  reasonable  notice  for  consultation  with any of the
         Trustees and officers of the Trust and  MassMutual  with respect to any
         matter  dealing with the business and affairs of the Fund,  such as the
         valuation  of  portfolio  securities  of the  Fund,  including  but not
         limited to securities that are either not registered for public sale or
         securities not traded on any securities market.

2.       Duties of the Sub-Adviser.

          (a)     The Sub-Adviser shall, subject to the direction and control by
                  the Trust's Board of Trustees or MassMutual, to the extent
                  MassMutual's direction is not inconsistent with that of the 
                  Board of Trustees, (i) regularly provide investment advice and
                  recommendations to the Fund, directly or through MassMutual,
                  with respect to the Fund's  investments, investment  policies
                  and the purchase  and sale of  securities; (ii) supervise and
                  monitor continuously the  investment program  of the Fund  and
                  the composition of its portfolio and determine what securities
                  shall be purchased or sold by the Fund; (iii) arrange, subject
                  to the  provisions  of Section  5 hereof, for the purchase of
                  securities and other investments for the  Fund and the sale of
                  securities and other investments held in the  portfolio of the
                  Fund; and (iv) provide reports on the foregoing to  the  Board
                  of Trustees at each Board meeting.

         (b)      Provided that none of MassMutual,  the Fund or the Trust shall
                  be required to pay any compensation  other than as provided by
                  the terms of this  Sub-Advisory  Agreement  and subject to the
                  provisions  of Section 5 hereof,  the  Sub-Adviser  may obtain
                  investment information,  research or assistance from any other
                  person, firm or corporation to supplement, update or otherwise
                  improve its investment management services.

         (c)      Provided  that  nothing  herein shall be deemed to protect the
                  Sub-Adviser  from  willful  misfeasance,  bad  faith  or gross
                  negligence  in the  performance  of its  duties,  or  reckless
                  disregard   to  its   obligations   and   duties   under  this
                  Sub-Advisory  Agreement,  the Sub-Adviser  shall not be liable
                  for any loss  sustained  by  reason  of good  faith  errors or
                  omissions  in  connection  with  any  matters  to  which  this
                  Sub-Advisory Agreement relates.

         (d)      Nothing  in  this   Sub-Advisory   Agreement   shall   prevent
                  MassMutual  or the  Sub-Adviser  or any officer  thereof  from
                  acting as  investment  adviser  or  sub-adviser  for any other
                  person,  firm or corporation and shall not in any way limit or
                  restrict  MassMutual  or  the  Sub-Adviser  or  any  of  their
                  respective  directors,   officers,  members,  stockholders  or
                  employees from buying,  selling, or trading any securities for
                  its own  account  or for the  account of others for whom it or
                  they may be acting,  provided  that such  activities  will not
                  adversely  affect or otherwise  impair the  performance by any
                  party of its duties and  obligations  under this  Sub-Advisory
                  Agreement.

         (e)      The  Sub-Adviser  shall cooperate with MassMutual by providing
                  MassMutual   with  any   information   in  the   Sub-Adviser's
                  possession  necessary for  supervising  the  activities of all
                  administrative  and clerical personnel as shall be required to
                  provide corporate  administration for the Fund,  including the
                  compilation  and  maintenance  of such records with respect to
                  its operations as may reasonably be required.  The Sub-Adviser
                  shall, at its own expense, provide such officers for the Trust
                  as its Board may request.

3.       Duties of MassMutual

         MassMutual shall provide the Sub-Adviser with the following information
about the Fund:

         (a)      cash flow estimates on request;

         (b)      notice of the Fund's "investable funds" by 9:00 a.m. each
                  business day;

         (c)      as they are modified,  from time to time,  current versions of
                  the documents  and policies  referred to in  Subsections  (c),
                  (d), (e) and (f) of Section 1 hereof, above.

4.       Compensation of the Sub-Adviser.

         MassMutual agrees to pay the Sub-Adviser and the Sub-Adviser  agrees to
         accept as full  compensation  for the  performance of all functions and
         duties on its part to be performed pursuant to the provisions hereof, a
         fee paid weekly at the annual rate .13% of the average  daily net asset
         value of the  Fund,  determined  at the  close  of the New  York  Stock
         Exchange on each day that the  Exchange is open for trading and paid on
         the last day of each week.




5.       Portfolio Transactions and Brokerage.

         (a)      The  Sub-Adviser is authorized,  in arranging the purchase and
                  sale of the Fund's  publicly-traded  portfolio securities,  to
                  employ or deal  with such  members  of  securities  exchanges,
                  brokers or dealers (hereinafter "broker- dealers"),  including
                  "affiliated"  broker-dealers,  as that term is  defined in the
                  Act, as may, in its best judgment, implement the policy of the
                  Fund to obtain,  at  reasonable  expense,  the best  execution
                  (prompt and reliable  execution at the most favorable security
                  price obtainable) of the Fund's portfolio transactions.

         (b)      The Sub-Adviser may effect the purchase and sale of securities
                  (which are otherwise publicly traded) in private  transactions
                  on  such  terms  and  conditions  as  are  customary  in  such
                  transactions,  may  use  a  broker  in  such  to  effect  said
                  transactions,  and may  enter  into a  contract  in which  the
                  broker acts either as principal or as agent.

                   The  Sub-Adviser  shall select  broker-dealers  to effect the
                  Fund's portfolio  transactions on the basis of its estimate of
                  their  ability to obtain  best  execution  of  particular  and
                  related   portfolio   transactions.   The   abilities   of   a
                  broker-dealer to obtain best execution of particular portfolio
                  transaction(s)  will be judged by the Sub-Adviser on the basis
                  of all relevant factors and considerations including,  insofar
                  as  feasible,  the  execution  capabilities  required  by  the
                  transaction or  transactions;  the ability and  willingness of
                  the   broker-dealer   to  facilitate   the  Fund's   portfolio
                  transactions by participating therein for its own account; the
                  importance    to   the   Fund   of   speed,    efficiency   or
                  confidentiality; the broker-dealer's apparent familiarity with
                  sources  from  or  to  whom  particular  securities  might  be
                  purchased or sold;  as well as any other  matters  relevant to
                  the selection of a  broker-dealer  for  particular and related
                  transactions of the Fund.

6.       Duration.

         Unless   terminated   earlier  pursuant  to  Section  7  hereof,   this
         Sub-Advisory  Agreement  shall  remain in effect  until August 2, 1997.
         Thereafter  it shall  continue in effect from year to year,  so long as
         such  continuance  shall be approved  at least  annually by the Trust's
         Board of Trustees,  including  the vote of the majority of the Trustees
         of the Trust who are not  parties  to this  Sub-Advisory  Agreement  or
         "interested  persons" (as defined in the Act) of any such party cast in
         person at a meeting  called for the purpose of voting on such approval,
         or by the  holders  of a  "majority"  (as  defined  in the  Act) of the
         outstanding voting securities of the Fund.

7.       Termination.

         This  Sub-Advisory  Agreement  shall terminate  automatically  upon its
         assignment  or in the  event  upon  the  termination  of  the  Advisory
         Agreement; it may also be terminated: (i) for cause or with the consent
         of the parties and the Trust by  MassMutual or the  Sub-Adviser  at any
         time without penalty upon sixty days' written notice to the other party
         and the Trust;  or (ii) by the Trust at any time  without  penalty upon
         sixty days' written notice to MassMutual and the  Sub-Adviser  provided
         that such  termination  by the Trust shall be directed or approved by a
         vote of a majority  of all of the  Trustees of the Trust then in office
         or by the vote of the holders of a "majority" of the outstanding voting
         securities of the Fund (as defined in the Act).

8.       Disclaimer of Shareholder Liability.

         MassMutual and the  Sub-Adviser  understand that the obligations of the
         Trust  under  this  Sub-Advisory  Agreement  are not  binding  upon any
         Trustee or shareholder of the Trust personally, but bind only the Trust
         and the Trust's property. MassMutual and the Sub-Adviser represent that
         each has notice of the  provisions of the Trust  Documents  disclaiming
         shareholder and Trustee liability for acts or obligations of the Trust.

9.       Notice.

         Any  notice  under this  Sub-Advisory  Agreement  shall be in  writing,
         addressed and delivered or mailed, postage prepaid, to the other party,
         with a copy to the Trust,  at the addresses below or such other address
         as such other party may designate for the receipt of such notice.

                  If to MassMutual:

                           Massachusetts Mutual Life Insurance Company
                           1295 State Street
                           Springfield, MA  01111
                           Attention:  Hamline C. Wilson
                                        Senior Managing Director

                  If to the Sub-Adviser:

                           David L. Babson and Company Incorporated
                           One Memorial Drive
                           Cambridge, MA 02142
                           Attention:  John V. Murphy
                                        Chief Operating Officer

                  If to either party, copies to:

                           MassMutual Institutional Funds
                           1295 State Street
                           Springfield, MA 01111
                           Attention:  Stuart H. Reese
                                        President
                           Investors Bank & Trust
                           89 South Street
                           Boston, MA  02111
                           Attention:  Susan Mosher, Esq.


         IN WITNESS  WHEREOF,  MassMutual and the  Sub-Adviser  have caused this
Sub-Advisory Agreement to be executed on the day and year first above written.


                            MASSACHUSETTS MUTUAL LIFE
                                            INSURANCE COMPANY



                                By:  ___________________________________
                                Hamline C. Wilson
                                Senior Managing Director



                                DAVID L. BABSON AND COMPANY INCORPORATED



                                By:  ____________________________________
                                John V. Murphy
                                Chief Operating Officer



         Accepted and Acknowledged:


         MASSMUTUAL INSTITUTIONAL FUNDS on behalf of
         the Value Equity Sector of the MASSMUTUAL BALANCED FUND




         By:  _____________________________________
               Stuart H. Reese
               President




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