000 A000000 03/31/2006
000 C000000 0000038188
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 FORT DEARBORN INCOME SECURITIES, INC.
001 B000000 811-02319
001 C000000 3126460676
002 A000000 ONE N. WACKER DR.
002 B000000 CHICAGO
002 C000000 IL
002 D010000 60606
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000 0
008 A000001 UBS GLOBAL ASSET MANAGEMENT (AMERICAS) INC.
008 B000001 A
008 C000001 801-34910
008 D010001 CHICAGO
008 D020001 IL
008 D030001 60606
008 D040001 1295
010 A000001 J.P. MORGAN INVESTOR SERVICES, CO.
010 B000001 84-1719
010 C010001 BOSTON
010 C020001 MA
010 C030001 02108
010 C040001 3913
012 A000001 Computershare Trust Company, N.A.
012 B000001 84-0000
012 C010001 PROVIDENCE
012 C020001 RI
012 C030001 02940
012 C040001 3069
013 A000001 ERNST & YOUNG LLP
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10036
014 A000001 CANTRADE PRIVATE BANK (CI) LTD.
014 B000001 8-000000
014 A000002 GAM SERVICES, INC.
014 B000002 8-00000000
014 A000003 GIUBERGIA UBS SIM SPA
014 B000003 8-00000000
014 A000004 PT UBS SECURITIES INDONESIA
014 B000004 8-00000000
014 A000005 UBS WEALTH MANAGEMENT AG
014 B000005 8-00000000
014 A000006 UBS AMERICAS, INC.
014 B000006 8-00000000
014 A000007 UBS BANK (CANADA)
014 B000007 8-00000000
014 A000008 UBS SERVICES (USA) LLC
014 B000008 8-00000000
014 A000009 UBS GLOBAL ASSET MANAGEMENT (US), INC.
014 B000009 8-00000000
014 A000010 UBS INTERNATIONAL, INC.
014 B000010 8-00000000
014 A000011 UBS FINANCIAL SERVICES, INC.
014 B000011 8-00000000
014 A000012 UBS INTERNATIONAL U.K. LTD.
014 B000012 8-00000000
014 A000013 UBS INTERNATIONAL (SINGAPORE) PTE, LTD.
014 B000013 8-00000000
014 A000014 UBS FINANCIAL SERVICES, INC. OF PUERTO RICO
014 B000014 8-00000000
014 A000015 UBS LIMITED
014 B000015 8-00000000
014 A000016 UBS (ASIA) LTD.
014 B000016 8-00000000
014 A000017 UBS (BAHAMAS) LTD.
014 B000017 8-00000000
014 A000018 UBS FUND SERVICES (CAYMAN) LTD.
014 B000018 8-00000000
014 A000019 UBS (MONACO) SA
014 B000019 8-00000000
014 A000020 UBS FUTURES & OPTIONS LTD.
014 B000020 8-00000000
014 A000021 UBS SECURITIES (CANADA), INC.
014 B000021 8-00000000
014 A000022 UBS SECURITIES LLC
014 B000022 8-00000000
014 A000023 UBS SECURITIES FRANCE SA
014 B000023 8-00000000
014 A000024 UBS FUTURES & OPTIONS SINGAPORE PTE LTD.
014 B000024 8-00000000
014 A000025 UBS SECURITIES ISRAEL LIMITED
014 B000025 8-00000000
014 A000026 UBS SECURITIES JAPAN LTD.
014 B000026 8-00000000
014 A000027 UBS INVESTMENT BANK NEDERLAND BV
014 B000027 8-00000000
014 A000028 UBS INVESTMENT BANK AG
014 B000028 8-00000000
014 A000029 UBS SECURITIES ASIA LTD.
014 B000029 8-00000000
014 A000030 UBS SECURITIES AUSTRALIA LTD.
014 B000030 8-00000000
014 A000031 UBS CAPITAL MARKETS AUSTRALIA LTD.
014 B000031 8-00000000
014 A000032 UBS CORRETORA DE CAMBIO E VALORES MOBILIARIOS
014 B000032 8-00000000
014 A000033 UBS DERIVATIVES HONG KONG LIMITED
014 B000033 8-00000000
014 A000034 UBS FUTURES, INC.
014 B000034 8-00000000
014 A000035 UBS SECURITIES HONG KONG LTD.
014 B000035 8-00000000
014 A000036 UBS NEW ZEALAND LTD.
014 B000036 8-00000000
014 A000037 UBS SECURITIES NEW ZEALAND LTD.
014 B000037 8-00000000
014 A000038 UBS PRIVATE CLIENTS AUSTRALIA LTD.
014 B000038 8-00000000
014 A000039 JULIUS BAER
014 B000039 8-00000000
014 A000040 UBS CASA DE BOLSA, S.A. DE C.V.
014 B000040 8-00000000
014 A000041 UBS BUNTING LTD.
014 B000041 8-00000000
015 A000001 JPMORGAN CHASE BANK
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10003
015 C040001 9598
015 E010001 X
018  000000 Y
019 A000000 Y
019 B000000   88
019 C000000 UBSGLBALAM
020 C000001      0
020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 JPMORGAN CHASE & CO.
022 B000001 13-3379014
022 C000001     18308
022 D000001     18436
022 A000002 DEUTSCHE BANK AG
022 B000002 62-1223991
022 C000002      9124
022 D000002     12485
022 A000003 MORGAN STANLEY & CO., INC.
022 B000003 13-2655985
022 C000003     10952
022 D000003      9815
022 A000004 LEHMAN BROTHERS, INC
022 B000004 13-2518466
022 C000004     11148
022 D000004      5740
022 A000005 BARCLAYS BANK PLC
022 B000005 13-4942190
022 C000005      7026
022 D000005      4317
022 A000006 MERRILL LYNCH, PIERCE, FENNER & SMITH
022 B000006 13-5674085
022 C000006      6028
022 D000006      4423
022 A000007 GOLDMAN SACHS & CO.
022 B000007 13-5108880
022 C000007         0
022 D000007      5322
022 A000008 BANK OF AMERICA CORP.
022 B000008 56-0906609
022 C000008      2456
022 D000008      2293
022 A000009 CREDIT SUISSE FIRST BOSTON
022 B000009 13-2853402
022 C000009       697
022 D000009      1626
022 A000010 BEAR STEARNS & CO., INC.
022 B000010 13-4946705
022 C000010       339
022 D000010       924
023 C000000      66582
023 D000000      67450
024  000000 Y
025 A000001 GOLDMAN SACHS & CO.
025 B000001 13-5108880
025 C000001 D
025 D000001    2216
025 A000002 MORGAN STANLEY & CO., INC.
025 B000002 13-2655985
025 C000002 D
025 D000002    2170
025 A000003 BANK OF AMERICA CORP.
025 B000003 56-0906609
025 C000003 D
025 D000003    2070
025 A000004 JPMORGAN CHASE & CO.
025 B000004 13-3379014
025 C000004 D
025 D000004    1893
025 A000005 CREDIT SUISSE FIRST BOSTON
025 B000005 13-2853402
025 C000005 D
025 D000005    1308
025 A000006 BARCLAYS BANK PLC
025 B000006 13-4942190
025 C000006 D
025 D000006     326
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
045  000000 Y
046  000000 N
047  000000 Y
048  000000  0.000
048 A010000   100000
048 A020000 0.500
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   100000
048 K020000 0.400
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 Y
054 H000000 N
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 Y
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   1.4
062 M000000  16.5
062 N000000   0.0
062 O000000   3.5
062 P000000  61.0
062 Q000000  16.5
062 R000000   0.0
063 A000000   0
063 B000000 14.0
064 A000000 N
064 B000000 N
066 A000000 N
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 N
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 N
070 N010000 N
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000     48950
071 B000000     51163
071 C000000    137089
071 D000000   36
072 A000000  6
072 B000000     4038
072 C000000        0
072 D000000        0
072 E000000        0
072 F000000      329
072 G000000        0
072 H000000        0
072 I000000       30
072 J000000       25
072 K000000        0
072 L000000       31
072 M000000       18
072 N000000        0
072 O000000        4
072 P000000        0
072 Q000000        0
072 R000000       23
072 S000000       32
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       26
072 X000000      518
072 Y000000        0
072 Z000000     3520
072AA000000        0
072BB000000       15
072CC010000        0
072CC020000     5149
072DD010000     3686
072DD020000        0
072EE000000     1237
073 A010000   0.4200
073 A020000   0.0000
073 B000000   0.1410
073 C000000   0.0000
074 A000000        0
074 B000000        0
074 C000000     1943
074 D000000   132555
074 E000000        0
074 F000000        0
074 G000000        0
074 H000000        0
074 I000000        0
074 J000000      366
074 K000000        0
074 L000000     1804
074 M000000       23
074 N000000   136691
074 O000000      532
074 P000000      161
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000       95
074 S000000        0
074 T000000   135903
074 U010000     8776
074 U020000        0
074 V010000    15.49
074 V020000     0.00
074 W000000   0.0000
074 X000000     2112
074 Y000000        0
075 A000000        0
075 B000000   140134
076  000000    14.06
077 A000000 Y
077 B000000 N
077 C000000 Y
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 N
077 Q020000 N
077 Q030000 N
078  000000 N
080 C000000
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 347200107
087 A030000 FDI
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE    JOSEPH MALONE
TITLE