PAGE 1
000 B000000 10/31/2015
000 C000000 0001285650
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 Y
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 CANADA SELF CUSTODY-CDSX DEBT CLEARING SYSTEM
015 B000002 S
015 C010002 TORONTO
015 D010002 CANADA
015 E040002 X
015 A000003 UBS AG
015 B000003 S
015 C010003 Zurich
015 D010003 SWITZERLAND
015 E040003 X
015 A000004 DEUTSCHE BANK AG FRANKFURT
015 B000004 S
015 C010004 FRANKFURT
015 D010004 GERMANY
015 E040004 X
015 A000005 SKANDINAVISKA ENSKILDA BANKEN
015 B000005 S
015 C010005 COPENHAGEN
015 D010005 DENMARK
015 E040005 X
015 A000006 EUROCLEAR
015 B000006 S
015 C010006 BRUSSELS
015 D010006 BELGIUM
015 E040006 X
015 A000007 STATE STREET BANK LONDON-CREST STD CHRTD BANK
015 B000007 S
015 C010007 LONDON
015 D010007 UNITED KINGDOM
015 E040007 X
015 A000008 STANDARD CHARTERED BANK
015 B000008 S
015 C010008 HONG KONG
015 D010008 HONG KONG
015 E040008 X
015 A000009 MIZUHO COPRORATE BANK, LTD.
015 B000009 S
015 C010009 TOKYO
015 D010009 JAPAN
015 E040009 X
015 A000010 DEUTSCHE BANK AG
015 B000010 S
015 C010010 SEOUL
015 D010010 Republic of Korea
015 E040010 X
015 A000011 DEUTSCHE BANK AG, NETHERLANDS
015 B000011 S
015 C010011 AMSTERDAM
015 D010011 THE NETHERLANDS
015 E040011 X
PAGE 3
015 A000012 FIRSTRAND BANK LIMITED
015 B000012 S
015 C010012 JOHANNESBURG
015 D010012 SOUTH AFRICA
015 D020012 2001
015 E040012 X
015 A000013 DEUTSCHE BANK AG
015 B000013 S
015 C010013 PARIS
015 D010013 FRANCE
015 E040013 X
015 A000014 DEUTSCHE BANK BELGIUM
015 B000014 S
015 C010014 BRUSSELS
015 D010014 BELGIUM
015 E040014 X
015 A000015 STANDARD AND CHARTERED BANK (TAIWAN) LTD.
015 B000015 S
015 C010015 TAIPEI
015 D010015 TAIWAN
015 E040015 X
015 A000016 STANDARD BANK OF SOUTH AFRICA LTD.
015 B000016 S
015 C010016 JOHANNESBURG
015 D010016 SOUTH AFRICA
015 E040016 X
018 000000 Y
019 A000000 Y
019 B000000 27
019 C000000 CALAMOSINV
020 A000001 CREDIT SUISSE FIRST BOSTON
020 B000001 13-2853402
020 C000001 19
020 A000002 JPMORGAN CHASE SECURITIES, INC.
020 B000002 13-3224016
020 C000002 16
020 A000003 BARCLAYS CAPITAL INC.
020 B000003 94-3231066
020 C000003 12
020 A000004 BANK OF AMERICA
020 B000004 56-0906609
020 C000004 9
020 A000005 JEFFERIES & COMPANY, INC.
020 B000005 95-2622900
020 C000005 9
020 A000006 BLOOMBERGTRADEBOOK EUROPE LIMITED
020 C000006 8
020 A000007 RW DAY & CO. LTD.
020 C000007 7
020 A000008 CREDIT LYONNAIS SECURITIES ASIA
020 B000008 13-2602298
PAGE 4
020 C000008 6
020 A000009 GOLDMAN SACHS & CO.
020 B000009 13-5108880
020 C000009 5
020 A000010 CALYON SECURITIES
020 B000010 13-2602298
020 C000010 5
021 000000 126
022 A000001 JEFFERIES & CO. INC.
022 B000001 95-2622900
022 C000001 7835
022 D000001 11597
022 A000002 NOMURA SECURITIES INTERNATIONAL, INC.
022 B000002 13-2642206
022 C000002 9133
022 D000002 7675
022 A000003 JPMORGAN CHASE SECURITIES, INC.
022 B000003 13-3224016
022 C000003 7511
022 D000003 9079
022 A000004 BARCLAYS CAPITAL INC.
022 B000004 94-3231066
022 C000004 3687
022 D000004 6867
022 A000005 CREDIT SUISSE FIRST BOSTON
022 B000005 13-2853402
022 C000005 4130
022 D000005 4156
022 A000006 BANK OF AMERICA
022 B000006 56-0906609
022 C000006 5365
022 D000006 1366
022 A000007 GOLDMAN SACHS & CO.
022 B000007 13-5108880
022 C000007 5865
022 D000007 387
022 A000008 BANK OF NEW YORK
022 B000008 13-3989198
022 C000008 1708
022 D000008 4379
022 A000009 Deutsche Bank A.G.
022 B000009 13-2730828
022 C000009 2502
022 D000009 3203
022 A000010 DAIWA SECURITIES AMERICA, INC.
022 B000010 13-5680329
022 C000010 1299
022 D000010 2961
023 C000000 59351
023 D000000 59757
024 000000 Y
PAGE 5
025 A000001 DAIWA SECURITIES AMERICA, INC.
025 B000001 13-5680329
025 C000001 E
025 D000001 1381
025 A000002 JP MORGAN CHASE & CO.
025 B000002 13-3224016
025 C000002 E
025 D000002 1182
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
PAGE 6
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 1.000
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
PAGE 7
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 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
PAGE 8
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
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 119103
071 B000000 134495
071 C000000 155988
071 D000000 76
072 A000000 12
072 B000000 2300
072 C000000 1859
072 D000000 0
072 E000000 19
072 F000000 1658
072 G000000 0
072 H000000 0
072 I000000 25
072 J000000 27
072 K000000 0
PAGE 9
072 L000000 47
072 M000000 20
072 N000000 2
072 O000000 0
072 P000000 431
072 Q000000 39
072 R000000 20
072 S000000 29
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 51
072 X000000 2349
072 Y000000 0
072 Z000000 1829
072AA000000 6927
072BB000000 1518
072CC010000 0
072CC020000 4883
072DD010000 7162
072DD020000 0
072EE000000 0
073 A010000 0.8500
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.3500
074 A000000 0
074 B000000 0
074 C000000 0
074 D000000 66083
074 E000000 5335
074 F000000 76267
074 G000000 219
074 H000000 0
074 I000000 8477
074 J000000 3898
074 K000000 0
074 L000000 572
074 M000000 91
074 N000000 160942
074 O000000 4083
074 P000000 222
074 Q000000 44000
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 163
074 S000000 0
074 T000000 112474
074 U010000 8465
074 U020000 0
PAGE 10
074 V010000 13.29
074 V020000 0.00
074 W000000 0.0000
074 X000000 5
074 Y000000 93548
075 A000000 0
075 B000000 116842
076 000000 11.96
077 A000000 Y
077 B000000 Y
077 C000000 N
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 Y
077 Q020000 N
077 Q030000 N
078 000000 N
080 A000000 ICI MUTUAL INSURANCE COMPANY
080 C000000 15000
081 A000000 Y
081 B000000 39
082 A000000 Y
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
PAGE 11
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