PAGE  1
000 A000000 04/30/2016
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 College Station
012 C020001 TX
012 C030001 77842
012 C040001 3170
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
      PAGE  2
015 E010001 X
015 A000002 UBS AG
015 B000002 S
015 C010002 Zurich
015 D010002 SWITZERLAND
015 E040002 X
015 A000003 DEUTSCHE BANK AG FRANKFURT
015 B000003 S
015 C010003 FRANKFURT
015 D010003 GERMANY
015 E040003 X
015 A000004 SKANDINAVISKA ENSKILDA BANKEN
015 B000004 S
015 C010004 COPENHAGEN
015 D010004 DENMARK
015 E040004 X
015 A000005 STATE STREET BK LONDON - CREST
015 B000005 S
015 C010005 LONDON
015 D010005 UNITED KINGDOM
015 E040005 X
015 A000006 STANDARD CHARTERED BANK
015 B000006 S
015 C010006 HONG KONG
015 D010006 HONG KONG
015 E040006 X
015 A000007 MIZUHO COPRORATE BANK, LTD.
015 B000007 S
015 C010007 TOKYO
015 D010007 JAPAN
015 E040007 X
015 A000008 DEUTSCHE BANK AG AMSTERDAM
015 B000008 S
015 C010008 AMSTERDAM
015 D010008 NETHERLANDS
015 E040008 X
015 A000009 DEUTSCHE BANK FRANCE
015 B000009 S
015 C010009 PARIS
015 D010009 FRANCE
015 E040009 X
015 A000010 DEUTSCHE BANK BELGIUM
015 B000010 S
015 C010010 BRUSSELS
015 D010010 BELGIUM
015 E040010 X
015 A000011 HONGKONG AND SHAGHAI BANKING CORP - CORP DEBT
015 B000011 S
015 C010011 TOKYO
015 D010011 JAPAN
015 E040011 X
      PAGE  3
015 A000012 STANDARD BANK OF SOUTH AFRICA LTD.
015 B000012 S
015 C010012 JOHANNESBURG
015 D010012 SOUTH AFRICA
015 E040012 X
018  000000 Y
019 A000000 Y
019 B000000   28
019 C000000 CALAMOSINV
020 A000001 JPMORGAN CHASE SECURITIES, INC.
020 B000001 13-3224016
020 C000001     18
020 A000002 BLOOMBERG TRADEBOOK LLC
020 B000002 13-3880286
020 C000002     15
020 A000003 CITIGROUP, INC.
020 B000003 52-1568099
020 C000003      6
020 A000004 CREDIT SUISSE FIRST BOSTON
020 B000004 13-2853402
020 C000004      5
020 A000005 JEFFERIES & COMPANY, INC.
020 B000005 95-2622900
020 C000005      4
020 A000006 Morgan Stanley & Inc.
020 B000006 13-2655998
020 C000006      3
020 A000007 BANK OF AMERICA
020 B000007 56-0906609
020 C000007      3
020 A000008 BARCLAYS CAPITAL INC.
020 B000008 94-3231066
020 C000008      3
020 A000009 DNB NOR MARKETS CUSTODY DNB NORBANK ASA
020 C000009      2
020 A000010 CREDIT LYONNAIS SECURITIES ASIA
020 B000010 13-2602298
020 C000010      2
021  000000       67
022 A000001 JEFFERIES & CO. INC.
022 B000001 95-2622900
022 C000001       675
022 D000001      9401
022 A000002 BARCLAYS CAPITAL INC.
022 B000002 94-3231066
022 C000002      5484
022 D000002      3197
022 A000003 BANK OF AMERICA
022 B000003 56-0906609
022 C000003      3998
022 D000003      1908
      PAGE  4
022 A000004 CREDIT SUISSE FIRST BOSTON
022 B000004 13-2853402
022 C000004      2157
022 D000004      3671
022 A000005 GOLDMAN SACHS & CO.
022 B000005 13-5108880
022 C000005      3592
022 D000005      2091
022 A000006 BANK OF NEW YORK
022 B000006 13-3989198
022 C000006       849
022 D000006      3876
022 A000007 JPMORGAN CHASE SECURITIES, INC.
022 B000007 13-3224016
022 C000007      1674
022 D000007      2489
022 A000008 WELLS FARGO BANK, NA
022 B000008 42-0945022
022 C000008      2424
022 D000008         0
022 A000009 UBS AG
022 B000009 98-0186363
022 C000009       772
022 D000009      1446
022 A000010 CREDIT AGRICOLE INDO SUEZ
022 B000010 13-2602298
022 C000010      2049
022 D000010         0
023 C000000      30714
023 D000000      33336
024  000000 Y
025 A000001 CITIGROUP, INC.
025 B000001 11-2418191
025 C000001 E
025 D000001     703
025 A000002 JPMORGAN CHASE SECURITIES, INC.
025 B000002 13-3224016
025 C000002 E
025 D000002    1454
025 A000003 WELLS FARGO BANK, NA
025 B000003 42-0945022
025 C000003 E
025 D000003    3013
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
      PAGE  5
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
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
      PAGE  6
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
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 Y
056  000000 Y
057  000000 N
058 A000000 N
      PAGE  7
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
070 B010000 Y
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
      PAGE  8
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     87102
071 B000000     86415
071 C000000    139325
071 D000000   62
072 A000000  6
072 B000000     1029
072 C000000      829
072 D000000        0
072 E000000        5
072 F000000      730
072 G000000        0
072 H000000        0
072 I000000       12
072 J000000        9
072 K000000        0
072 L000000       22
072 M000000       10
072 N000000        1
072 O000000        0
072 P000000      237
072 Q000000       18
072 R000000       13
072 S000000       16
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       29
072 X000000     1097
072 Y000000        0
072 Z000000      766
072AA000000     3729
      PAGE  9
072BB000000      431
072CC010000        0
072CC020000     8055
072DD010000     5079
072DD020000        0
072EE000000        0
073 A010000   0.6000
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000       28
074 B000000        0
074 C000000        0
074 D000000    56807
074 E000000     7218
074 F000000    79098
074 G000000       15
074 H000000        0
074 I000000     2031
074 J000000        0
074 K000000        0
074 L000000      650
074 M000000       92
074 N000000   145940
074 O000000        0
074 P000000      206
074 Q000000    42000
074 R010000        0
074 R020000        0
074 R030000      226
074 R040000      104
074 S000000        0
074 T000000   103404
074 U010000     8465
074 U020000        0
074 V010000    12.22
074 V020000     0.00
074 W000000   0.0000
074 X000000        5
074 Y000000    90763
075 A000000        0
075 B000000   104208
076  000000    11.01
077 A000000 N
078  000000 N
080 C000000        0
081 B000000   0
082 B000000        0
083 B000000        0
084 B000000        0
086 A010000      0
      PAGE  10
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
088 A000000 N
088 B000000 N
088 C000000 Y
088 D000000 N
SIGNATURE   CURTIS HOLLOWAY
TITLE       TREASURER