<PAGE> PAGE 1
000 A000000 06/30/96
000 C000000 0000045949
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 HARTFORD MUTUAL INVESTMENT FUND, INC.
001 B000000 811-1761
001 C000000 8606452589
002 A000000 923 MAIN STREET
002 B000000 MANCHESTER
002 C000000 CT
002 D010000 06040
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
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007 C010100 1
007 C010200 2
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
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007 C011200 12
007 C011300 13
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<PAGE> PAGE 2
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019 B000000 0
020 A000001 OTA
020 B000001 13-3545927
020 C000001 10
020 A000002 PAINEWEBBER
020 B000002 13-2638166
020 C000002 4
020 A000003 ALEX BROWN
020 B000003 52-1319768
020 C000003 3
020 A000004 C.J. LAWRENCE
020 B000004 13-2730828
020 C000004 2
020 A000005 JEFFRIES
020 B000005 95-2622900
020 C000005 1
020 A000006 MONTGOMERY
020 B000006 94-1701676
020 C000006 1
020 A000007 WILLIAM BLAIR
020 B000007 36-2214610
020 C000007 1
020 A000008 HAMBRECHT & QUIST
020 B000008 94-2856935
020 C000008 1
020 A000009 CHICAGO CORP
020 B000009 36-2549961
020 C000009 1
020 A000010 QUICK & REILLY
020 B000010 13-2967453
<PAGE> PAGE 3
020 C000010 1
021 000000 24
022 A000001 SMITH BARNEY, SHEARSON
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022 C000005 734
022 D000005 419
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022 A000007 MERRILL LYNCH
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022 D000008 367
022 A000009 MONTGOMERY
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022 A000010 PAINEWEBBER
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<PAGE> PAGE 4
025 D000008 0
027 000000 Y
028 A010000 801
028 A020000 0
028 A030000 0
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028 B020000 297
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<PAGE> PAGE 5
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071 C000000 15414
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<PAGE> PAGE 6
072 A000000 6
072 B000000 18
072 C000000 34
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073 A020000 0.0000
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<PAGE> PAGE 7
074 O000000 146
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SIGNATURE NICHOLAS B. MASON
TITLE SECRETARY
<TABLE> <S> <C>
<PAGE>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS AS OF AND FOR THE SIX MONTHS ENDED JUNE 30, 1996 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1996
<PERIOD-START> JAN-01-1996
<PERIOD-END> JUN-30-1996
<INVESTMENTS-AT-COST> 14,731
<INVESTMENTS-AT-VALUE> 16,618
<RECEIVABLES> 113
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 16,731
<PAYABLE-FOR-SECURITIES> 146
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 21
<TOTAL-LIABILITIES> 167
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 15,054
<SHARES-COMMON-STOCK> 248,056
<SHARES-COMMON-PRIOR> 203,806
<ACCUMULATED-NII-CURRENT> (115)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 377
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,887
<NET-ASSETS> 16,563
<DIVIDEND-INCOME> 34
<INTEREST-INCOME> 18
<OTHER-INCOME> 0
<EXPENSES-NET> 58
<NET-INVESTMENT-INCOME> (7)
<REALIZED-GAINS-CURRENT> (331)
<APPREC-INCREASE-CURRENT> 1,254
<NET-CHANGE-FROM-OPS> 916
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 309
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 39,626
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 4,624
<NET-CHANGE-IN-ASSETS> 3,418
<ACCUMULATED-NII-PRIOR> (109)
<ACCUMULATED-GAINS-PRIOR> 633
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 37
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 58
<AVERAGE-NET-ASSETS> 15,189
<PER-SHARE-NAV-BEGIN> 64.50
<PER-SHARE-NII> (.03)
<PER-SHARE-GAIN-APPREC> 3.69
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 1.39
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 66.77
<EXPENSE-RATIO> .38
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
