PAGE  1
000 B000000 09/30/2005
000 C000000 910068
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 HIGH INCOME OPPORTUNITY FUND INC.
001 B000000 811-7920
001 C000000 8004512010
002 A000000 125 BROAD STREET
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10004
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
008 A000001 SMITH BARNEY FUND MANAGEMENT LLC
008 B000001 A
008 C000001 801-8314
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10022
011 A000001 CITIGROUP GLOBAL MARKET INC.
011 B000001 8-8177
011 C010001 NEW YORK
011 C020001 NY
011 C030001 10004
012 A000001 PFPC INC.
012 B000001 84-1761
012 C010001 PROVIDENCE
012 C020001 RI
012 C030001 02940
013 A000001 KPMG LLP
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10017
014 A0000** CITICORP CAPITAL PHILLIPINES, INC.
014 A0000** CITICORP SECURITIES INTERNATIONAL (RP) INC.
014 A0000** CITIGROUP (CHILE) S.A. CORREDORES DE BOLSA
014 A0000** CITIGROUP GLOBAL MARKETS CHINA LIMITED
014 A0000** CITIGROUP GLOBAL MARKETS POLSKA SP. ZO.O
014 A0000** SALOMON BROTHERS ASSET MANAGE. ASIA PAC LTD.
014 A0000** SALOMON BROTHERS ASSET MANAGEMENT INC.
014 A0000** SALOMON BROTHERS ASSET MANAGEMENT LIMITED
      PAGE  2
014 A0000** SALOMON BROTHERS UK LIMITED
014 A0000** SALOMON SMITH BARNEY AUS. CAP MKTS PTY LTD.
014 A0000** SALOMON SMITH BARNEY AUS. CORP. FIN. PTY LTD.
014 A0000** SALOMON SMITH BARNEY SA
014 A0000** SMITH BARNEY FUND MANAGEMENT LLC
014 A0000** SALOMON SMITH BARNEY SECURITIES (TAIWAN) LTD
014 A0000** SMITH BARNEY GLOBAL CAPITAL MANAGEMENT, INC.
014 A0000** SMITH BARNEY STRAGEGY ADVISERS INC.
014 A0000** TL&A INSURANCE DISTRIBUTION LLC
014 A0000** TRAVELERS ASSET MANAGEMENT INTL CORP.
014 A0000** TRAVELERS INVESTMENT ADVISERS, INC.
014 A0000** TRIBECA MANAGEMENT, LLC
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 B0000** 8-0
014 A000001 ACCIONES Y VALORES DE MEXICO, S.A. DE C.V.
014 B000001 8-0
014 A000002 CASA DE BOLSA BANAMEX, S.A. DE C.V. GRUPO FX
014 B000002 8-0
014 A000003 CITI VALORES DE EL SALVADOR S.A. DE C.V.
014 B000003 8-0
014 A000004 CITIBANK (SWITZERLAND)
014 B000004 8-0
014 A000005 CITIBANK AGENCIA DE VALORES S.A.
014 B000005 8-0
014 A000006 CITIBANK MERCADO DE CAPITALES, CA CITMERCA
014 B000006 8-0
014 A000007 CITIBANK SECURITIES (TAIWAN) LIMITED
014 B000007 8-0
014 A000008 CITIBANK-CORRETORA DE CAMBIO, TUTULOS E VALO.
014 B000008 8-0
014 A000009 CITIBANK-DISTRIBUIDORA DE TITULOS E VALORES
014 B000009 8-0
014 A000010 CITICORP BROKERAGE (INDIA) LIMITED
      PAGE  3
014 B000010 8-0
014 A000011 CITICORP CAPITAL MARKETS AUSTRALIA LIMITED
014 B000011 8-0
014 A000012 CITICORP CAPITAL MARKETS LIMITED
014 B000012 8-0
014 A000013 CITICORP CAPITAL MARKETS SOCIEDAD ANONIMA
014 B000013 8-0
014 A000014 CITICORP CAPITAL MARKETS URUGUAY S.A.
014 B000014 8-0
014 A000015 CITICORP DERIVATIVES MARKETS INC.
014 B000015 8-0
014 A000016 CITICORP FINANCIAL SERVICES CORPORATION
014 B000016 8-0
014 A000017 CITICORP INTERNATIONAL LIMITED
014 B000017 8-0
014 A000018 CITICORP INTERNATIONAL SECURITIES LTD.
014 B000018 8-0
014 A000019 CITICORP INVERSORA S.A. GERENTE DE FONDOS
014 B000019 8-0
014 A000020 CITICORP INVESTMENT BANK (SINGAPORE) LIMITED
014 B000020 8-0
014 A000021 CITICORP INVESTMENT SERVICES
014 B000021 8-0
014 A000022 CITICORP MERCHANT BANK LIMITED
014 B000022 8-0
014 A000023 CITICORP PERU S.A. SOCIEDAD AGENTE DE BOLSA
014 B000023 8-0
014 A000024 CITICORP SECURITIES (CR) S.R.O.
014 B000024 8-0
014 A000025 CITICORP SECURITIES (JAPAN) LIMITED
014 B000025 8-0
014 A000026 CITICORP SECURITIES (THAILAND) LTD.
014 B000026 8-0
014 A000027 CITICORP SECURITIES ASIA PACIFIC LIMITED
014 B000027 8-0
014 A000028 CITICORP SECURITIES SERVICES, INC.
014 B000028 8-0
014 A000029 CITICORP TRUST BANK, FSB
014 B000029 8-0
014 A000030 CITIGROUP ASSET MANAGEMENT AUSTRALIA LIMITED
014 B000030 8-0
014 A000031 CITIGROUP GLOBAL MARKETS (GUERNSEY) LIMITED
014 B000031 8-0
014 A000032 CITIGROUP GLOBAL MARKETS (PROPRIETARY) LTD.
014 B000032 8-0
014 A000033 CITIGROUP GLOBAL MARKETS ASIA LIMITED
014 B000033 8-0
014 A000034 CITIGROUP GLOBAL MARKETS AUSTRALIA FIXED INC.
014 B000034 8-0
014 A000035 CITIGROUP GLOBAL MARKETS AUSTRALIA PTY LTD.
014 B000035 8-0
      PAGE  4
014 A000036 CITIGROUP GLOBAL MARKETS CANADA INC.
014 B000036 8-0
014 A000037 CITIGROUP GLOBAL MARKETS INC.
014 B000037 8-0
014 A000038 CITIGROUP GLOBAL MARKETS INDIA PRIVATE LTD.
014 B000038 8-0
014 A000039 CITIGROUP GLOBAL MARKETS KOREA SECURITIES LTD
014 B000039 8-0
014 A000040 CITIGROUP GLOBAL MARKETS LIMITED
014 B000040 8-0
014 A000041 CITIGROUP GLOBAL MARKETS MALAYSIA SDN. BHD.
014 B000041 8-0
014 A000042 CITIGROUP GLOBAL MARKETS MAURITIUS PRIVATE
014 B000042 8-0
014 A000043 CITIGROUP GLOBAL MARKETS NEW ZEALAND LIMITED
014 B000043 8-0
014 A000044 CITIGROUP GLOBAL MARKETS PUERTO RICO INC.
014 B000044 8-0
014 A000045 CITIGROUP GLOBAL MARKETS REPRESENTACOES LTDA.
014 B000045 8-0
014 A000046 CITIGROUP GLOBAL MARKETS SINGAPORE PTE. LTD.
014 B000046 8-0
014 A000047 CITIGROUP GLOBAL MARKETS TAIWAN LIMITED
014 B000047 8-0
014 A000048 CITIGROUP GLOBAL MARKETS U.K. EQUITY LIMITED
014 B000048 8-0
014 A000049 CITINVERSIONES DE TUTULOS Y VALORES (PUESTO)
014 B000049 8-0
014 A000050 CITINVERSIONES, S.A.
014 B000050 8-0
014 A000051 CITISECURITIES LIMITED
014 B000051 8-0
014 A000052 CITISTREET ADVISORS LLC
014 B000052 8-0
014 A000053 CITISTREET EQUITIES LLC
014 B000053 8-0
014 A000054 CITITRADING S.A. CASA SE VALORES
014 B000054 8-0
014 A000055 CITIVALORES DE HONDURAS, S.A.
014 B000055 8-0
014 A000056 CITIVALORES PUESTO DE BOLSA, S.A.
014 B000056 8-0
014 A000057 CITIVALORES S.A. COMISIONISTA DE BOLSA
014 B000057 8-0
014 A000058 CITIVALORES, S.A. (GUATEMALA)
014 B000058 8-0
014 A000059 CITIVALORES, S.A. (PANAMA CITY)
014 B000059 8-0
014 A000060 DOM MAKLERSKI BANKU HANDLOWEGO S.A.
014 B000060 8-0
014 A000061 LAVA TRADING, INC.
      PAGE  5
014 B000061 8-0
014 A000062 LATIN AMERICAN INVESTMENT BANK BAHAMAS LTD.
014 B000062 8-0
014 A000063 NIKKO CITIGROUP LIMITED
014 B000063 8-0
014 A000064 PFS INVESTMENTS INC.
014 B000064 8-0
014 A000065 PFSL INVESTMENTS INC.
014 B000065 8-0
014 A000066 PT. CITIGROUP SECURITIES INDONESIA
014 B000066 8-0
014 A000067 SALOMON REINVESTMENT COMPANY, INC.
014 B000067 8-0
014 A000068 SALOMON SMITH BARNEY ASIA LIMITED
014 B000068 8-0
014 A000069 SALOMON SMITH BARNEY SECURITIES ASIA LIMITED
014 B000069 8-0
014 A000070 SALOMON SWAPCO INC.
014 B000070 8-0
014 A000071 SMITH BARNEY CITIGROUP AUSTRALIA PTY LIMITED
014 B000071 8-0
014 A000072 TOWER SQUARE SECURITIES, INC.
014 B000072 8-0
014 A000073 TRAVELERS DISTRIBUTION LLC
014 B000073 8-0
014 A000074 ZAO CITIGROUP GLOBAL MARKETS
014 B000074 8-0
014 A000075 BANCO CITIBANK S.A.
014 B000075 8-0
014 A000076 CITIBANK AKTIENGESELLSCHAFT
014 B000076 8-0
014 A000077 CITIBANK BELGIUM S.A./N.V.
014 B000077 8-0
014 A000078 CITIBANK BERHAD
014 B000078 8-0
014 A000079 CITIBANK CANADA
014 B000079 8-0
014 A000080 CITIBANK GLOBAL ASSET MANAGEMENT (ASIA) LTD
014 B000080 8-0
014 A000081 CITIBANK INTERNATIONAL
014 B000081 8-0
014 A000082 CITIBANK INTERNATIONAL PLC
014 B000082 8-0
014 A000083 CITIBANK INVESTMENT AND SECURITIES RT.
014 B000083 8-0
014 A000084 CITIBANK LIMITED
014 B000084 8-0
014 A000085 CITIBANK MALAYSIA (L) LIMITED
014 B000085 8-0
014 A000086 CITIBANK PRIVATKUNDEN AG
014 B000086 8-0
      PAGE  6
014 A000087 CITIBANK, N.A.
014 B000087 8-0
014 A000088 CITIBROKERAGE S.A.
014 B000088 8-0
014 A000089 CITIBUSINESS-LEASING FINANCIAL SERV CO. LTD.
014 B000089 8-0
014 A000090 CITICORP VALORES S.A. SOCIEDAD DE BOLSA
014 B000090 8-0
014 A000091 CITICORP VENTURE CAPITAL BERATUNGS GMBH
014 B000091 8-0
014 A000092 CITIGROUP GENEVA CAPITAL STRATEGIES
014 B000092 8-0
014 A000093 CITIGROUP INC.
014 B000093 8-0
014 A000094 CITISTREET FINANCIAL SERVICES LLC
014 B000094 8-0
014 A000095 CITISTREET FUNDS MANAGEMENT LLC
014 B000095 8-0
014 A000096 CITIVALORES DE EL SALVADOR S.A. DE C.V.
014 B000096 8-0
014 A000097 FORUM SECURITIES SERVICES LTD.
014 B000097 8-0
014 A000098 INARCO INTERNATIONAL BANK NV
014 B000098 8-0
014 A000099 PFS DISTRIBUTORS, INC.
014 B000099 8-0
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
015 E010001 X
018  000000 Y
019 A000000 Y
019 B000000  185
019 C000000 BARNEYOOOO
021  000000        0
022 A000001 UBS FINANCIAL SERVICES INC.
022 B000001 13-3873456
022 C000001   3754728
022 D000001      2453
022 A000002 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
022 B000002 13-5674085
022 C000002   1984497
022 D000002      1321
022 A000003 BARCLAYS BANK PLC
022 B000003 13-3551367
022 C000003    420409
022 D000003         0
022 A000004 GOLDMAN SACHS & CO.
022 B000004 13-5108880
      PAGE  7
022 C000004    293175
022 D000004      3469
022 A000005 DEUTSCHE BANK SECURITIES INC
022 B000005 13-6124068
022 C000005    184675
022 D000005      1908
022 A000006 BANK OF AMERICA
022 B000006 95-4035346
022 C000006     50158
022 D000006       963
022 A000007 MORGAN STANLEY CO INC.
022 B000007 13-2655998
022 C000007     33423
022 D000007      5241
022 A000008 LEHMAN BROTHERS INC.
022 B000008 13-2518466
022 C000008     23810
022 D000008      3829
022 A000009 JPMORGAN CHASE & CO.
022 B000009 13-3224016
022 C000009     13814
022 D000009      4757
022 A000010 BEAR STEARNS SECURITIES CORP
022 B000010 13-3299429
022 C000010      8802
022 D000010      3091
023 C000000    6757480
023 D000000      23434
024  000000 N
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 N
028 A010000         0
028 A020000         0
028 A030000         0
028 A040000         0
028 B010000         0
028 B020000         0
028 B030000         0
028 B040000         0
028 C010000         0
028 C020000         0
028 C030000         0
028 C040000         0
      PAGE  8
028 D010000         0
028 D020000         0
028 D030000         0
028 D040000         0
028 E010000         0
028 E020000         0
028 E030000         0
028 E040000         0
028 F010000         0
028 F020000         0
028 F030000         0
028 F040000         0
028 G010000         0
028 G020000         0
028 G030000         0
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
044  000000      0
045  000000 Y
046  000000 N
047  000000 Y
048  000000  1.150
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
      PAGE  9
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
049  000000 N
050  000000 N
051  000000 N
052  000000 N
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 Y
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 Y
054 M000000 Y
054 N000000 N
054 O000000 Y
055 A000000 N
055 B000000 N
056  000000 N
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 Y
060 B000000 Y
061  000000        0
062 A000000 Y
062 B000000   0.0
062 C000000   0.0
062 D000000   5.5
062 E000000   0.0
062 F000000   0.0
062 G000000   0.0
062 H000000   0.0
062 I000000   0.0
062 J000000   0.0
      PAGE  10
062 K000000   0.0
062 L000000   0.0
062 M000000   0.0
062 N000000   0.0
062 O000000   0.0
062 P000000  89.9
062 Q000000   1.1
062 R000000   2.5
063 A000000   0
063 B000000  8.5
064 A000000 N
064 B000000 Y
065  000000 N
066 A000000 N
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 Y
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 N
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 N
070 O020000 N
070 P010000 N
070 P020000 N
070 Q010000 N
      PAGE  11
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000    109460
071 B000000    120557
071 C000000    504261
071 D000000   22
072 A000000 12
072 B000000    44634
072 C000000      162
072 D000000        0
072 E000000        0
072 F000000     6193
072 G000000        0
072 H000000        0
072 I000000       30
072 J000000       68
072 K000000        0
072 L000000      253
072 M000000        7
072 N000000       71
072 O000000        0
072 P000000        0
072 Q000000        0
072 R000000       34
072 S000000       54
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       19
072 X000000     6729
072 Y000000        0
072 Z000000    38067
072AA000000     5682
072BB000000        0
072CC010000        0
072CC020000    12302
072DD010000    40364
072DD020000        0
072EE000000        0
073 A010000   0.5460
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000      198
074 B000000    29035
074 C000000        0
074 D000000   480943
074 E000000     6974
074 F000000     5803
074 G000000        0
      PAGE  12
074 H000000        0
074 I000000      734
074 J000000        0
074 K000000        0
074 L000000     9661
074 M000000      211
074 N000000   533559
074 O000000      925
074 P000000     3612
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000      227
074 S000000        0
074 T000000   528795
074 U010000    73927
074 U020000        0
074 V010000     7.15
074 V020000     0.00
074 W000000   0.0000
074 X000000      782
074 Y000000        0
075 A000000        0
075 B000000   537247
076  000000     6.29
077 A000000 Y
077 B000000 Y
077 C000000 Y
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078  000000 N
080 A000000 ICI MUTUAL INSURANCE COMPANY
080 C000000   145000
081 A000000 Y
081 B000000 185
082 A000000 Y
      PAGE  13
082 B000000      100
083 A000000 N
083 B000000        0
084 A000000 N
084 B000000        0
085 A000000 Y
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
087 A010000 HIGH INCOME OPPORTUNITY FUND INC.
087 A020000 42967Q105
087 A030000 HIO
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE   ROBERT BRAULT
TITLE       TREASURER