PAGE  1
000 A000000 04/30/2006
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 CORPORATION
010 B000001 01-07511
010 C010001 BOSTON
010 C020001 MA
010 C030001 02110
012 A000001 BANK OF NEW YORK (COMMON)
012 B000001 85-05006
012 C010001 NEW YORK
012 C020001 NY
012 C030001 10286
013 A000001 DELOITTE & TOUCHE, LLP
013 B010001 CHICAGO
013 B020001 IL
013 B030001 60601
014 A000001 CALAMOS FINANCIAL SERVICES LLC
014 B000001 8-37854
015 A000001 BANK OF NEW YORK
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10286
015 E010001 X
      PAGE  2
015 A000002 Banca Intesa
015 B000002 S
015 C010002 Milan
015 D010002 Italy
015 E040002 X
015 A000003 BNY LONDON - CREST
015 B000003 S
015 C010003 LONDON
015 D010003 UNITED KINGDOM
015 E040003 X
015 A000004 Credit Suisse Zurich
015 B000004 S
015 C010004 Zurich
015 D010004 Switzerland
015 E040004 X
015 A000005 Euroclear Bank
015 B000005 S
015 C010005 Brussels
015 D010005 Belgium
015 E040005 X
015 A000006 National Australia Bank
015 B000006 S
015 C010006 Melbourne
015 D010006 Australia
015 E040006 X
015 A000007 BNP Paribas Security Services
015 B000007 S
015 C010007 Athens
015 D010007 Greece
015 E040007 X
015 A000008 Royal Bank of Canada
015 B000008 S
015 C010008 Toronto
015 D010008 Canada
015 E040008 X
015 A000009 Standard Bank SA
015 B000009 S
015 C010009 Johannesburg
015 D010009 South Africa
015 E040009 X
015 A000010 Skandinaviska Enskilda Banken
015 B000010 S
015 C010010 Stockholm
015 D010010 Sweden
015 E040010 X
015 A000011 Nordea Bank Finland
015 B000011 S
015 C010011 Helsinki
015 D010011 Finland
015 E040011 X
015 A000012 The Bank of Tokyo-Mitsibushi Limited
      PAGE  3
015 B000012 S
015 C010012 Tokyo
015 D010012 Japan
015 E040012 X
015 A000013 Bank Austria AG
015 B000013 S
015 C010013 Vienna
015 D010013 Austria
015 E040013 X
015 A000014 United Overseas Bank Ltd./DBS Bank Ltd.
015 B000014 S
015 C010014 N/A
015 D010014 Singapore
015 E040014 X
018  000000 Y
019 A000000 Y
019 B000000   14
019 C000000 CALAMOSINV
020 A000001 DEUTSCHE BANK SECURITIES, INC.
020 B000001 13-2730828
020 C000001     32
020 A000002 MORGAN STANLEY
020 B000002 13-2655998
020 C000002     23
020 A000003 BANK OF NEW YORK
020 B000003 13-3894751
020 C000003      6
020 A000004 J.P. MORGAN SECURITIES INC.
020 B000004 13-3224016
020 C000004      6
020 A000005 CREDIT SUISSE FIRST BOSTON
020 B000005 13-2853402
020 C000005      6
020 A000006 NCB Stockbrokers LTD.
020 C000006      6
020 A000007 ITG, INC.
020 B000007 95-4339369
020 C000007      5
020 A000008 CITIGROUP GLOBAL MARKETS, INC.
020 B000008 11-2418191
020 C000008      4
020 A000009 GGET LLC
020 B000009 13-4138399
020 C000009      3
020 A000010 UBS Financial
020 B000010 13-2638166
020 C000010      3
021  000000      110
022 A000001 BANK OF NEW YORK
022 B000001 13-3894751
022 C000001   1129485
      PAGE  4
022 D000001         0
022 A000002 BANK OF AMERICA SECURITIES LLC
022 B000002 56-2058405
022 C000002     12174
022 D000002       911
022 A000003 DEUTSCHE BANK SECURITIES, INC.
022 B000003 13-2730828
022 C000003     12423
022 D000003       615
022 A000004 LEHMAN BROTHERS
022 B000004 13-2518466
022 C000004      8170
022 D000004         0
022 A000005 J.P. MORGAN SECURITIES INC.
022 B000005 13-3224016
022 C000005      7739
022 D000005         0
022 A000006 DAIWA SECURITIES GROUP
022 B000006 13-5680329
022 C000006      7569
022 D000006         0
022 A000007 UBS Financial
022 B000007 13-2638166
022 C000007      7550
022 D000007         0
022 A000008 CITIGROUP GLOBAL MARKETS, INC.
022 B000008 11-2418191
022 C000008      7175
022 D000008         0
022 A000009 KBC SECURITIES
022 B000009 06-1548680
022 C000009      6334
022 D000009         0
022 A000010 CREDIT SUISSE FIRST BOSTON
022 B000010 13-2853402
022 C000010      6166
022 D000010         0
023 C000000    1230837
023 D000000       1526
024  000000 Y
025 A000001 DEUTSCHE BANK SECURITIES, INC.
025 B000001 13-2730828
025 C000001 D
025 D000001    1195
025 A000002 LEHMAN BROTHERS
025 B000002 13-2518466
025 C000002 E
025 D000002    2627
025 A000003 J.P. MORGAN SECURITIES INC.
025 B000003 13-3224016
025 C000003 E
      PAGE  5
025 D000003    1815
025 A000004 MORGAN STANLEY
025 B000004 13-2655998
025 C000004 E
025 D000004     957
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
033  000000      0
      PAGE  6
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
054 G000000 N
      PAGE  7
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 N
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 Y
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 Y
      PAGE  8
070 B020000 Y
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 N
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000    185286
071 B000000     13902
071 C000000    159965
071 D000000    9
072 A000000  6
072 B000000     2641
072 C000000     1517
072 D000000        0
072 E000000       16
072 F000000      788
072 G000000        0
072 H000000        0
072 I000000       57
072 J000000       11
072 K000000        0
072 L000000       35
072 M000000        8
072 N000000       16
      PAGE  9
072 O000000        0
072 P000000        0
072 Q000000       22
072 R000000       26
072 S000000        3
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000        3
072 X000000      969
072 Y000000        0
072 Z000000     3205
072AA000000     1534
072BB000000      277
072CC010000    17648
072CC020000        0
072DD010000     2602
072DD020000        0
072EE000000        0
073 A010000   0.3300
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000        1
074 B000000        0
074 C000000      630
074 D000000    70918
074 E000000    16637
074 F000000   103496
074 G000000        0
074 H000000        0
074 I000000    14805
074 J000000        0
074 K000000        0
074 L000000     2037
074 M000000       16
074 N000000   208540
074 O000000        0
074 P000000      124
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000     1939
074 R040000    15229
074 S000000    59040
074 T000000   132208
074 U010000     8007
074 U020000        0
074 V010000    16.51
074 V020000     0.00
074 W000000   0.0000
      PAGE  10
074 X000000        6
074 Y000000        1
075 A000000        0
075 B000000   122155
076  000000    14.44
077 A000000 N
078  000000 N
080 C000000        0
081 B000000   0
082 B000000        0
083 B000000        0
084 B000000        0
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 Common Stock
087 A020000 128118106
087 A030000 CGO
087 B010000 Preferred Stock
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE   NIMISH BHATT
TITLE       TREASURER