<PAGE> PAGE 1
000 B000000 12/31/97
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
007 B000000 0
007 C010100 1
007 C010200 2
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
007 C011100 11
007 C011200 12
007 C011300 13
007 C011400 14
007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
007 C012000 20
007 C012100 21
007 C012200 22
007 C012300 23
007 C012400 24
007 C012500 25
007 C012600 26
007 C012700 27
007 C012800 28
007 C012900 29
<PAGE> PAGE 2
007 C013000 30
007 C013100 31
007 C013200 32
007 C013300 33
007 C013400 34
007 C013500 35
007 C013600 36
007 C013700 37
007 C013800 38
007 C013900 39
007 C014000 40
007 C014100 41
007 C014200 42
007 C014300 43
007 C014400 44
007 C014500 45
007 C014600 46
007 C014700 47
007 C014800 48
007 C014900 49
007 C015000 50
019 B000000 0
020 A000001 PAINE WEBBER
020 B000001 13-2638166
020 C000001 15
020 A000002 OTA
020 B000002 13-3545927
020 C000002 12
020 A000003 INSTINET
020 B000003 13-2596491
020 C000003 3
020 A000004 HAMBRECHT & QUIST
020 B000004 94-2856935
020 C000004 2
020 A000005 JEFFRIES
020 B000005 95-2622900
020 C000005 2
020 A000006 ALLEN EWING
020 B000006 59-3000850
020 C000006 2
020 A000007 CHICAGO CORP
020 B000007 36-2549961
020 C000007 2
020 A000008 SOUNDVIEW
020 B000008 13-2998183
020 C000008 2
020 A000009 ALEX BROWN
020 B000009 52-1319768
020 C000009 1
020 A000010 C.J. LAWRENCE
020 B000010 13-2730828
<PAGE> PAGE 3
020 C000010 1
021 000000 43
022 A000001 SMITH BARNEY, SHEARSON
022 B000001 13-2919773
022 C000001 2872
022 D000001 3649
022 A000002 INSTINET
022 B000002 13-2596491
022 C000002 2915
022 D000002 2364
022 A000003 HERZOG
022 B000003 13-1955436
022 C000003 691
022 D000003 1744
022 A000004 ALEX BROWN
022 B000004 52-1319768
022 C000004 2003
022 D000004 393
022 A000005 MORGAN STANLEY
022 B000005 13-2655998
022 C000005 369
022 D000005 1477
022 A000006 PAINEWEBBER
022 B000006 13-2638166
022 C000006 132
022 D000006 1245
022 A000007 GOLDMAN SACHS
022 B000007 13-5108880
022 C000007 427
022 D000007 807
022 A000008 ROBERTSON STEPHENS
022 B000008 94-2524501
022 C000008 892
022 D000008 236
022 A000009 JEFFRIES
022 B000009 95-2622900
022 C000009 617
022 D000009 499
022 A000010 SOUNDVIEW
022 B000010 13-2998183
022 C000010 421
022 D000010 461
023 C000000 39087
023 D000000 37337
024 000000 N
025 D000001 0
025 D000002 0
025 D000003 0
025 D000004 0
025 D000005 0
025 D000006 0
<PAGE> PAGE 4
025 D000007 0
025 D000008 0
027 000000 Y
028 A010000 10
028 A020000 0
028 A030000 155
028 A040000 0
028 B010000 10
028 B020000 0
028 B030000 0
028 B040000 0
028 C010000 20
028 C020000 0
028 C030000 0
028 C040000 0
028 D010000 20
028 D020000 0
028 D030000 0
028 D040000 0
028 E010000 20
028 E020000 0
028 E030000 0
028 E040000 0
028 F010000 0
028 F020000 2265
028 F030000 279
028 F040000 0
028 G010000 80
028 G020000 2265
028 G030000 434
028 G040000 0
028 H000000 0
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
031 B000000 0
032 000000 0
033 000000 0
035 000000 0
036 B000000 0
038 000000 0
042 A000000 0
042 B000000 0
042 C000000 0
042 D000000 0
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 0
<PAGE> PAGE 5
044 000000 0
048 000000 0.000
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
048 K020000 0.000
055 A000000 Y
061 000000 0
062 A000000 N
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 0
063 B000000 0.0
066 A000000 Y
066 D000000 Y
071 A000000 21625
071 B000000 21970
071 C000000 19860
<PAGE> PAGE 6
071 D000000 109
072 A000000 12
072 B000000 13
072 C000000 46
072 D000000 0
072 E000000 0
072 F000000 88
072 G000000 0
072 H000000 0
072 I000000 0
072 J000000 28
072 K000000 0
072 L000000 0
072 M000000 0
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 12
072 S000000 6
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 2
072 X000000 136
072 Y000000 0
072 Z000000 -78
072AA000000 2998
072BB000000 390
072CC010000 0
072CC020000 956
072DD010000 0
072DD020000 0
072EE000000 2727
073 A010000 0.0000
073 A020000 0.0000
073 B000000 11.0600
073 C000000 0.0000
074 A000000 0
074 B000000 0
074 C000000 0
074 D000000 0
074 E000000 0
074 F000000 17749
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 558
074 K000000 0
074 L000000 7
074 M000000 34
<PAGE> PAGE 7
074 N000000 18349
074 O000000 144
074 P000000 0
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 444
074 S000000 0
074 T000000 17761
074 U010000 278671
074 U020000 0
074 V010000 63.73
074 V020000 0.00
074 W000000 0.0000
074 X000000 10
074 Y000000 0
075 A000000 0
075 B000000 19860
076 000000 0.00
077 A000000 Y
077 B000000 Y
077 Q010000 Y
077 Q020000 N
077 Q030000 N
080 A000000 TRAVELERS INSURANCE COMPANY
080 C000000 300
081 A000000 N
081 B000000 0
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 N
085 B000000 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
SIGNATURE NICHOLAS B. MASON
TITLE SECRETARY
<TABLE> <S> <C>
<PAGE>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE AUDITED
FINANCIAL STATEMENTS AS OF AND FOR THE YEAR ENDED DECEMBER 31, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1997
<PERIOD-START> JAN-01-1997
<PERIOD-END> DEC-31-1997
<INVESTMENTS-AT-COST> 16,898
<INVESTMENTS-AT-VALUE> 17,749
<RECEIVABLES> 565
<ASSETS-OTHER> 34
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 18,349
<PAYABLE-FOR-SECURITIES> 144
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 444
<TOTAL-LIABILITIES> 588
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 17,058
<SHARES-COMMON-STOCK> 278,671
<SHARES-COMMON-PRIOR> 249,864
<ACCUMULATED-NII-CURRENT> (228)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 79
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 851
<NET-ASSETS> 17,761
<DIVIDEND-INCOME> 46
<INTEREST-INCOME> 13
<OTHER-INCOME> 0
<EXPENSES-NET> 136
<NET-INVESTMENT-INCOME> (78)
<REALIZED-GAINS-CURRENT> 2,608
<APPREC-INCREASE-CURRENT> (956)
<NET-CHANGE-FROM-OPS> 1,574
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 2,727
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,969
<NUMBER-OF-SHARES-REDEEMED> 14,775
<SHARES-REINVESTED> 36,613
<NET-CHANGE-IN-ASSETS> 731
<ACCUMULATED-NII-PRIOR> (150)
<ACCUMULATED-GAINS-PRIOR> 198
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 88
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 136
<AVERAGE-NET-ASSETS> 17,396
<PER-SHARE-NAV-BEGIN> 68.16
<PER-SHARE-NII> (.35)
<PER-SHARE-GAIN-APPREC> 6.98
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 11.06
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 63.73
<EXPENSE-RATIO> .78
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<PAGE>
[LETTERHEAD OF COOPERS & LYBRAND APPEARS HERE]
REPORT OF INDEPENDENT ACCOUNTANTS
---------------------------------
To the Shareholders and Board of Directors of
the Hartford Mutual Investment Fund, Inc.:
In planning and performing our audit of the financial statements and financial
highlights of the Hartford Mutual Investment Fund, Inc. for the year ended
December 31, 1997, we considered its internal controls, including control over
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 Hartford Mutual Investment Fund, Inc. is responsible for
establishing and maintaining an internal control. In fulfilling this
responsibility, estimates and judgments by management are required to assess the
expected benefits and related costs of controls. Generally, controls that are
relevant to an audit pertain to the entity's objective of preparing financial
statements and financial highlights for external purposes that are fairly
presented in conformity with generally accepted accounting principles. Those
controls include the safeguarding of assets against unauthorized acquisition,
use or disposition.
Because of inherent limitations in internal controls, errors or fraud may occur
and may not be detected. Also, projection of any evaluation of internal control
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 internal control would not necessarily disclose all
matters in the internal control 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 component does not reduce to
a relatively low level the risk that errors or fraud 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 internal control, including controls over safeguarding
securities, that we consider to be material weaknesses, as defined
above, as of December 31, 1997.
This report is intended solely for the information and use of management of the
Hartford Mutual Investment Fund, Inc.
/s/ COOPERS & LYBRAND L.L.P.
Hartford, Connecticut
February 13, 1998
