PAGE 1
000 A000000 04/30/2013
000 C000000 0001275214
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 STRATEGIC TOTAL RETURN FUND
001 B000000 811-21484
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 & TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02111
015 E010001 X
PAGE 2
015 A000002 Hongkong and Shanghai Banking Corp
015 B000002 S
015 C010002 Seoul
015 D010002 Republic of Korea
015 E040002 X
015 A000003 DEUTSCHE BANK AG FRANKFURT
015 B000003 S
015 C010003 FRANKFURT
015 D010003 GERMANY
015 E040003 X
015 A000004 EUROCLEAR BANK
015 B000004 S
015 C010004 BRUSSELS
015 D010004 BELGIUM
015 E040004 X
015 A000005 STANDARD CHARTERED BANK
015 B000005 S
015 C010005 TAIPEI
015 D010005 TAIWAN
015 E040005 X
015 A000006 DEUTSCHE BANK PARIS
015 B000006 S
015 C010006 PARIS
015 D010006 FRANCE
015 E040006 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 40
020 A000002 Deutsche Bank AG
020 B000002 13-2730828
020 C000002 29
020 A000003 BARCLAYS GLOBAL INVESTORS SERVICES
020 B000003 94-3231066
020 C000003 28
020 A000004 UBS WARBURG
020 B000004 13-2932996
020 C000004 24
020 A000005 BAIRD ROBERT W. & CO, INC.
020 B000005 39-6037917
020 C000005 24
020 A000006 GOLDMAN SACHS & CO.
020 B000006 13-5108880
020 C000006 23
020 A000007 CREDIT SUISSE FIRST BOSTON
020 B000007 13-2853402
020 C000007 23
020 A000008 INVESTMENT TECHNOLOGY GROUP, INC.
PAGE 3
020 B000008 13-3757717
020 C000008 10
020 A000009 JEFFERIES & CO INC
020 B000009 95-262290
020 C000009 10
020 A000010 LAZARD FRERES & CO. LLC
020 B000010 13-5545100
020 C000010 8
021 000000 274
022 A000001 BANK OF AMERICA
022 B000001 56-0906609
022 C000001 57894
022 D000001 61230
022 A000002 J.P. MORGAN SECURITIES INC.
022 B000002 13-3224016
022 C000002 35876
022 D000002 51331
022 A000003 CITIGROUP, INC.
022 B000003 11-2418191
022 C000003 17145
022 D000003 49255
022 A000004 BNP Paribas Securites Corp.
022 B000004 94-1677765
022 C000004 25000
022 D000004 29814
022 A000005 CREDIT SUISSE FIRST BOSTON
022 B000005 13-2853402
022 C000005 29973
022 D000005 11975
022 A000006 WELLS FARGO BANK, N.A.
022 B000006 34-1542819
022 C000006 4534
022 D000006 35308
022 A000007 DEUTSCHE BANK SECURITIES, INC.
022 B000007 13-2730828
022 C000007 24675
022 D000007 1190
022 A000008 DAIWA CAPITAL MARKET AMERICA INC
022 B000008 13-5680329
022 C000008 7854
022 D000008 17826
022 A000009 NOMURA SECURITIES
022 B000009 13-2642206
022 C000009 0
022 D000009 23882
022 A000010 GOLDMAN SACHS & CO.
022 B000010 13-5108880
022 C000010 18194
022 D000010 4476
023 C000000 646880
023 D000000 728530
PAGE 4
024 000000 Y
025 A000001 J.P. MORGAN SECURITIES LLC
025 B000001 13-3224016
025 C000001 E
025 D000001 48275
025 A000002 CITIGROUP, INC.
025 B000002 11-2418191
025 C000002 E
025 D000002 8060
025 A000003 BANK OF AMERICA CORP.
025 B000003 56-0906609
025 C000003 E
025 D000003 6155
025 A000004 WELLS FARGO BANK, N.A.
025 B000004 34-1542819
025 C000004 E
025 D000004 8799
025 A000005 GOLDMAN SACHS & CO.
025 B000005 13-5108880
025 C000005 E
025 D000005 17236
025 A000006 JEFFERIES & CO INC
025 B000006 95-262290
025 C000006 D
025 D000006 8999
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
PAGE 5
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
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
PAGE 6
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 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
PAGE 7
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
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
PAGE 8
070 R010000 Y
070 R020000 N
071 A000000 608968
071 B000000 613841
071 C000000 2198989
071 D000000 28
072 A000000 6
072 B000000 26081
072 C000000 21533
072 D000000 0
072 E000000 245
072 F000000 11196
072 G000000 0
072 H000000 0
072 I000000 10
072 J000000 59
072 K000000 0
072 L000000 126
072 M000000 50
072 N000000 2
072 O000000 0
072 P000000 2981
072 Q000000 194
072 R000000 53
072 S000000 -61
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 88
072 X000000 14698
072 Y000000 0
072 Z000000 33161
072AA000000 0
072BB000000 29401
072CC010000 154617
072CC020000 0
072DD010000 64896
072DD020000 0
072EE000000 0
073 A010000 0.4200
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 0
074 B000000 0
074 C000000 9312
074 D000000 816597
074 E000000 124739
074 F000000 1313353
074 G000000 2069
074 H000000 0
PAGE 9
074 I000000 56854
074 J000000 9604
074 K000000 0
074 L000000 14736
074 M000000 348
074 N000000 2347613
074 O000000 5794
074 P000000 2184
074 Q000000 606000
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 8729
074 S000000 0
074 T000000 1724906
074 U010000 154514
074 U020000 0
074 V010000 11.16
074 V020000 0.00
074 W000000 0.0000
074 X000000 90
074 Y000000 1152331
075 A000000 0
075 B000000 1671062
076 000000 0.00
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
SIGNATURE CURTIS HOLLOWAY
TITLE TREASURER