PAGE  1
000 B000000 11/30/2011
000 C000000 0001190935
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 PIMCO CORPORATE OPPORTUNITY FUND
001 B000000 811-21238
001 C000000 2127393371
002 A000000 1633 BROADWAY
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10019
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
008 A000001 ALLIANZ GLOBAL INVESTORS FUND MANAGEMENT LLC
008 B000001 A
008 C000001 801-57798
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10019
008 A000002 PACIFIC INVESTMENT MANAGEMENT COMPANY LLC
008 B000002 S
008 C000002 801-48187
008 D010002 NEWPORT BEACH
008 D020002 CA
008 D030002 92660
010 A000001 ALLIANZ GLOBAL INVESTORS FUND MANAGEMENT LLC
010 B000001 801-57798
010 C010001 NEW YORK
010 C020001 NY
010 C030001 10019
012 A000001 BNY Mellon
012 B000001 84-58023
012 C010001 Providence
012 C020001 RI
012 C030001 02940
012 C040001 3027
013 A000001 PRICEWATERHOUSECOOPERS LLP
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10017
014 A000001 ALLIANZ GLOBAL INVESTORS DISTRIBUTORS LLC
      PAGE  2
014 B000001 8-041811
014 A000002 PIMCO INVESTMENTS LLC
014 B000002 8-68686
015 A000001 STATE STREET BANK & TRUST CO.
015 B000001 C
015 C010001 KANSAS CITY
015 C020001 MO
015 C030001 64105
015 C040001 1307
015 E010001 X
015 A000002 DEUTSCHE BANK AG
015 B000002 S
015 C010002 PARIS
015 D010002 FRANCE
015 E040002 X
015 A000003 CLEARSTREAM BANKING S.A.
015 B000003 S
015 C010003 LUXEMBOURG
015 D010003 LUXEMBOURG
015 E040003 X
015 A000004 CITIBANK N.A. - BRAZIL
015 B000004 S
015 C010004 SAO PAULO
015 D010004 BRAZIL
015 E040004 X
018  000000 Y
019 A000000 Y
019 B000000   75
019 C000000 ALLIANZGLO
020 A000001 THE GOLDMAN SACHS GROUP, INC.
020 B000001 13-4019460
020 C000001      7
020 A000002 DEUTSCHE BANK AG
020 B000002 13-2944980
020 C000002      4
020 A000003 UBS AG
020 B000003 13-3873456
020 C000003      1
021  000000       12
022 A000001 BARCLAYS CAPITAL, INC.
022 B000001 06-1031656
022 C000001    638002
022 D000001   1654426
022 A000002 STATE STREET BANK & TRUST CO.
022 B000002 04-2456637
022 C000002    845507
022 D000002    599300
022 A000003 BANK OF AMERICA CORP.
022 B000003 56-0906609
022 C000003    276981
022 D000003    812573
      PAGE  3
022 A000004 MORGAN STANLEY
022 B000004 36-3145972
022 C000004    805522
022 D000004      8248
022 A000005 DEUTSCHE BANK AG
022 B000005 13-2944980
022 C000005     45257
022 D000005    477966
022 A000006 JPMORGAN CHASE & CO.
022 B000006 13-3224016
022 C000006    313361
022 D000006    158179
022 A000007 CREDIT SUISSE GROUP
022 B000007 13-5659485
022 C000007    169537
022 D000007    184532
022 A000008 GREENWICH CAPITAL MARKETS, INC.
022 B000008 13-3172275
022 C000008         0
022 D000008    348419
022 A000009 CITIGROUP, INC.
022 B000009 52-1568099
022 C000009    181803
022 D000009    129334
022 A000010 NOMURA HOLDINGS, INC.
022 C000010     90903
022 D000010     66739
023 C000000    3755084
023 D000000    4533481
024  000000 Y
025 A000001 JPMORGAN CHASE & CO.
025 B000001 13-3224016
025 C000001 D
025 D000001   61919
025 A000002 THE GOLDMAN SACHS GROUP, INC.
025 B000002 13-4019460
025 C000002 D
025 D000002   47055
025 A000003 BANK OF AMERICA CORP.
025 B000003 56-0906609
025 C000003 D
025 D000003   42118
025 A000004 BARCLAYS CAPITAL, INC.
025 B000004 06-1031656
025 C000004 D
025 D000004   29869
025 A000005 CITIGROUP, INC.
025 B000005 52-1568099
025 C000005 E
025 D000005   14632
025 A000006 CITIGROUP, INC.
      PAGE  4
025 B000006 52-1568099
025 C000006 D
025 D000006   10539
025 A000007 CREDIT SUISSE GROUP
025 B000007 13-5659485
025 C000007 D
025 D000007    9115
025 A000008 STATE STREET BANK & TRUST CO.
025 B000008 04-2456637
025 C000008 D
025 D000008    3412
025 A000009 MORGAN STANLEY
025 B000009 36-3145972
025 C000009 D
025 D000009    1738
026 A000000 N
026 B000000 N
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
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
      PAGE  5
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  0.600
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
049  000000 N
050  000000 N
      PAGE  6
051  000000 N
052  000000 N
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
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 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 Y
055 B000000 N
056  000000 Y
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 Y
060 B000000 Y
061  000000        0
062 A000000 Y
062 B000000   4.3
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   1.5
062 M000000   0.0
062 N000000   0.0
062 O000000  22.8
062 P000000  62.5
062 Q000000  20.0
062 R000000  10.1
063 A000000   0
063 B000000  6.1
064 A000000 Y
064 B000000 Y
065  000000 N
066 A000000 N
      PAGE  7
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 Y
070 E020000 N
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 Y
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000    878173
071 B000000    926479
071 C000000   1657570
071 D000000   53
072 A000000 12
072 B000000   128534
072 C000000    10219
072 D000000        0
072 E000000      227
072 F000000     8442
072 G000000        0
      PAGE  8
072 H000000        0
072 I000000       30
072 J000000      436
072 K000000        0
072 L000000      217
072 M000000      158
072 N000000        0
072 O000000        0
072 P000000     1635
072 Q000000        0
072 R000000      119
072 S000000      114
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000      627
072 X000000    11778
072 Y000000        0
072 Z000000   127202
072AA000000    37069
072BB000000        0
072CC010000        0
072CC020000   164908
072DD010000   140163
072DD020000        0
072EE000000        0
073 A010000   2.0700
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000      286
074 B000000        0
074 C000000    75753
074 D000000  1359786
074 E000000   130231
074 F000000        0
074 G000000        0
074 H000000        0
074 I000000      290
074 J000000      270
074 K000000        0
074 L000000    28626
074 M000000    13700
074 N000000  1608942
074 O000000    18012
074 P000000      648
074 Q000000        0
074 R010000   230212
074 R020000        0
074 R030000        0
074 R040000    67875
      PAGE  9
074 S000000   325000
074 T000000   967195
074 U010000    68001
074 U020000        0
074 V010000    14.22
074 V020000     0.00
074 W000000   0.0000
074 X000000      118
074 Y000000   295827
075 A000000        0
075 B000000  1407043
076  000000    16.78
077 A000000 Y
077 B000000 Y
077 C000000 Y
077 D000000 Y
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 Y
077 Q020000 N
077 Q030000 N
078  000000 N
080 A000000 Great American Insurance Group
080 B000000 National Union Fire Insurance Company
080 C000000    62500
081 A000000 Y
081 B000000  74
082 A000000 Y
082 B000000      250
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
      PAGE  10
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 COMMON
087 A020000 72201B101
087 A030000 PTY
087 B010000 PREFERRED
087 B020000 72201B200
087 B030000 SERIES M
087 C010000 PREFERRED
087 C020000 72201B309
087 C030000 SERIES T
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE   LAWRENCE G. ALTADONNA
TITLE       TREASURER