PAGE 1
000 A000000 04/30/2012
000 C000000 0001285650
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 Calamos Global Total Return Fund
001 B000000 811-21547
001 C000000 6302457200
002 A000000 2020 Calamos Court
002 B000000 Naperville
002 C000000 IL
002 D010000 60563
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
008 A000001 CALAMOS ADVISORS LLC
008 B000001 A
008 C000001 801-29688
008 D010001 NAPERVILLE
008 D020001 IL
008 D030001 60563
010 A000001 State Street Bank and Trust Company
010 B000001 028-00733
010 C010001 Boston
010 C020001 MA
010 C030001 02111
012 A000001 COMPUTERSHARE
012 B000001 85-05006
012 C010001 JERSEY CITY
012 C020001 NJ
012 C030001 07310
013 A000001 Deloitte & Touche LLP
013 B010001 Chicago
013 B020001 IL
013 B030001 60606
014 A000001 CALAMOS FINANCIAL SERVICES LLC
014 B000001 8-37854
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02111
015 E010001 X
PAGE 2
015 A000002 CITIBANK NA
015 B000002 S
015 C010002 SAO PAULO
015 D010002 BRAZIL
015 E040002 X
015 A000003 Skandinaviska Enskilda Banken
015 B000003 S
015 C010003 COPENHAGEN
015 D010003 DENMARK
015 E040003 X
015 A000004 EUROCLEAR BANK
015 B000004 S
015 C010004 BRUSSELS
015 D010004 BELGIUM
015 E040004 X
015 A000005 DEUTSCHE BANK PARIS
015 B000005 S
015 C010005 PARIS
015 D010005 FRANCE
015 E040005 X
015 A000006 DEUTSCHE BANK AG FRANKFURT
015 B000006 S
015 C010006 FRANKFURT
015 D010006 GERMANY
015 E040006 X
015 A000007 HSBC - JAPAN
015 B000007 S
015 C010007 TOKYO
015 D010007 JAPAN
015 E040007 X
015 A000008 Credit Suisse Zurich
015 B000008 S
015 C010008 Zurich
015 D010008 Switzerland
015 E040008 X
015 A000009 STANDARD CHARTERED BANK
015 B000009 S
015 C010009 KWUN TONG
015 D010009 HONG KONG
015 E040009 X
015 A000010 STATE STREET BANK AND TRUST COMPANY
015 B000010 S
015 C010010 LONDON
015 D010010 UNITED KINGDOM
015 E040010 X
015 A000011 CANADA SELF CUSTODY-CDSX DEBT CLEARING SYSTEM
015 B000011 S
015 C010011 TORONTO
015 D010011 CANADA
015 E040011 X
015 A000012 CLEARSTREAM BANKING SA
PAGE 3
015 B000012 S
015 C010012 LUXEMBOURG
015 D010012 LUXEMBOURG
015 E040012 X
015 A000013 STANDARD CHARTERED BANK
015 B000013 S
015 C010013 TAIPEI
015 D010013 TAIWAN
015 E040013 X
015 A000014 DEUTSCHE BANK A.G.
015 B000014 S
015 C010014 AMSTERDAM
015 D010014 NETHERLANDS
015 E040014 X
015 A000015 HSBC AUSTRALIA
015 B000015 S
015 C010015 MELBOURNE
015 D010015 AUSTRALIA
015 E040015 X
015 A000016 SKANDINAVISKA ENSKILDA BANKEN
015 B000016 S
015 C010016 STOCKHOLM
015 D010016 SWEDEN
015 E040016 X
015 A000017 SKANDINAVISKA ENSKILDA BANKEN
015 B000017 S
015 C010017 OSLO
015 D010017 NORWAY
015 E040017 X
018 000000 Y
019 A000000 Y
019 B000000 19
019 C000000 CALAMOSINV
020 A000001 J.P. MORGAN SECURITIES INC.
020 B000001 13-3224016
020 C000001 10
020 A000002 BANK OF AMERICA
020 B000002 56-0906609
020 C000002 8
020 A000003 CREDIT SUISSE FIRST BOSTON
020 B000003 13-2853402
020 C000003 5
020 A000004 CALYON SECURITIES
020 B000004 13-2602298
020 C000004 4
020 A000005 NOMURA SECURITIES INTERNATIONAL INC.
020 B000005 13-2642206
020 C000005 2
020 A000006 BARCLAYS GLOBAL INVESTORS SERVICES
020 B000006 94-3231066
020 C000006 1
PAGE 4
020 A000007 Jonestrading Institutional Services LLC
020 B000007 51-0484896
020 C000007 1
020 A000008 DEUTSCHE BANK SECURITIES, INC.
020 B000008 13-2730828
020 C000008 1
020 A000009 GOLDMAN SACHS & CO.
020 B000009 13-5108880
020 C000009 1
020 A000010 G TRADE
020 B000010 14-1950353
020 C000010 1
021 000000 36
022 A000001 BNP PARIBAS
022 B000001 13-1929559
022 C000001 12157
022 D000001 12000
022 A000002 J.P. MORGAN SECURITIES INC.
022 B000002 13-3224016
022 C000002 6339
022 D000002 3005
022 A000003 WELLS FARGO SECURITIES, LLC
022 B000003 94-3379992
022 C000003 40
022 D000003 4351
022 A000004 CITIGROUP, INC.
022 B000004 11-2418191
022 C000004 0
022 D000004 4084
022 A000005 BANK OF AMERICA
022 B000005 56-0906609
022 C000005 1874
022 D000005 835
022 A000006 MORGAN STANLEY & CO., INC.
022 B000006 13-2655998
022 C000006 1281
022 D000006 0
022 A000007 ROYAL BANK OF SCOTLAND
022 B000007 56-1688522
022 C000007 1202
022 D000007 0
022 A000008 GOLDMAN SACHS & CO.
022 B000008 13-5108880
022 C000008 1200
022 D000008 0
022 A000009 DEUTSCHE BANK SECURITIES, INC.
022 B000009 13-2730828
022 C000009 99
022 D000009 999
022 A000010 NOMURA SECURITIES INTERNATIONAL INC.
022 B000010 13-2642206
PAGE 5
022 C000010 330
022 D000010 600
023 C000000 49124
023 D000000 44589
024 000000 N
025 D000001 0
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
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
PAGE 6
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 1.000
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
049 000000 N
050 000000 N
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
PAGE 7
054 G000000 N
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 N
055 B000000 Y
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 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 B000000 N
066 C000000 N
066 D000000 N
066 E000000 N
066 F000000 N
066 G000000 Y
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
PAGE 8
070 B010000 Y
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 Y
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 Y
070 O010000 Y
070 O020000 Y
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000 39288
071 B000000 48077
071 C000000 155205
071 D000000 25
072 A000000 6
072 B000000 1497
072 C000000 994
072 D000000 0
072 E000000 8
072 F000000 796
072 G000000 0
072 H000000 0
072 I000000 13
072 J000000 14
072 K000000 0
072 L000000 24
072 M000000 10
PAGE 9
072 N000000 28
072 O000000 0
072 P000000 290
072 Q000000 18
072 R000000 11
072 S000000 17
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 11
072 X000000 1232
072 Y000000 0
072 Z000000 1267
072AA000000 3482
072BB000000 278
072CC010000 0
072CC020000 94
072DD010000 4351
072DD020000 0
072EE000000 603
073 A010000 0.5300
073 A020000 0.0000
073 B000000 0.0700
073 C000000 0.0000
074 A000000 0
074 B000000 0
074 C000000 1201
074 D000000 68479
074 E000000 3738
074 F000000 80142
074 G000000 0
074 H000000 0
074 I000000 9583
074 J000000 0
074 K000000 0
074 L000000 1099
074 M000000 68
074 N000000 164310
074 O000000 2363
074 P000000 195
074 Q000000 41000
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 652
074 S000000 0
074 T000000 120100
074 U010000 8293
074 U020000 0
074 V010000 14.48
074 V020000 0.00
PAGE 10
074 W000000 0.0000
074 X000000 0
074 Y000000 95030
075 A000000 0
075 B000000 119643
076 000000 14.61
077 A000000 N
078 000000 N
080 C000000 0
081 B000000 0
082 B000000 0
083 B000000 0
084 B000000 0
086 A010000 48
086 A020000 690
086 B010000 31
086 B020000 441
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 Common Stock
087 A020000 128118106
087 A030000 CGO
088 A000000 N
088 B000000 N
088 C000000 Y
088 D000000 N
SIGNATURE CURTIS HOLLOWAY
TITLE TREASURER