NUVEEN SENIOR INCOME FUND
NSAR-A, 2000-03-31
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<PAGE>      PAGE  1
000 A000000 01/31/2000
000 C000000 0001093428
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 NUVEEN SENIOR INCOME FUND
001 B000000 811-09571
001 C000000 3129177700
002 A000000 333 WEST WACKER DRIVE
002 B000000 CHICAGO
002 C000000 IL
002 D010000 60606
002 D020000 1286
003  000000 Y
004  000000 N
005  000000 N
006  000000 N
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007 C010100  1
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007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A000001 NUVEEN SENIOR LOAN ASSET MANAGEMENT INC.
008 B000001 A
008 C000001 801-56905
008 D010001 CHICAGO
008 D020001 IL
008 D030001 60606
008 D040001 1286
011 A000001 JOHN NUVEEN & CO. INC.
011 B000001 8-13464
011 C010001 CHICAGO
011 C020001 IL
011 C030001 60606
011 C040001 1286
012 A000001 CHASE GLOBAL FUNDS SERVICES COMPANY
012 B000001 85-10233
012 C010001 BOSTON
012 C020001 MA
012 C030001 02108
<PAGE>      PAGE  2
012 C040001 3913
013 A000001 KPMG LLP
013 B010001 CHICAGO
013 B020001 IL
013 B030001 60601
014 A000001 JOHN NUVEEN & CO., INC.
014 B000001 8-13464
015 A000001 CHASE BANK OF TEXAS, NATIONAL ASSOCIATION
015 B000001 C
015 C010001 HOUSTON
015 C020001 TX
015 C030001 77002
015 E010001 X
018  000000 Y
019 A000000 Y
019 B000000  106
019 C000000 NUVEENFUND
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020 C000002      0
020 C000003      0
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020 C000006      0
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020 C000010      0
021  000000        0
022 A000001 MERRILL LYNCH
022 B000001 13-5674085
022 C000001    148850
022 D000001      9942
022 A000002 CHASE MANHATTAN
022 B000002 13-2633612
022 C000002     93207
022 D000002         0
022 A000003 CIBC, INC
022 B000003 13-2798343
022 C000003     44735
022 D000003         0
022 A000004 DLJ CAPITAL FUNDING, INC.
022 B000004 13-3902248
022 C000004     35999
022 D000004         0
022 A000005 CITIBANK
022 B000005 13-3187336
022 C000005     32512
022 D000005         0
022 A000006 LEHMAN COMMERCIAL PAPER
022 B000006 13-2518466
022 C000006     15512
<PAGE>      PAGE  3
022 D000006      4005
022 A000007 J.P. MORGAN
022 B000007 13-3224016
022 C000007     10031
022 D000007         0
022 A000008 CREDIT SUISSE FIRST BOSTON
022 B000008 13-5659485
022 C000008      9290
022 D000008         0
022 A000009 BANKERS TRUST
022 B000009 13-4941247
022 C000009      2488
022 D000009         0
022 A000010 CREDIT LYONNAIS
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022 D000010         0
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<PAGE>      PAGE  4
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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SIGNATURE   STEPHEN D. FOY
TITLE       V.P. & CONTROLLER



<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains Summary Financial Information extracted from the Form
N-SAR and the financial statements and is qualified in its entirety by
references to such documents.
</LEGEND>
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-2000
<PERIOD-START>                             AUG-01-1999
<PERIOD-END>                               JAN-31-2000
<INVESTMENTS-AT-COST>                           411221
<INVESTMENTS-AT-VALUE>                          410464
<RECEIVABLES>                                     3123
<ASSETS-OTHER>                                     765
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  414352
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       130285
<TOTAL-LIABILITIES>                             130285
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        282486
<SHARES-COMMON-STOCK>                            29611
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                         2186
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            152
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         (757)
<NET-ASSETS>                                    284067
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 7732
<OTHER-INCOME>                                      48
<EXPENSES-NET>                                    1093
<NET-INVESTMENT-INCOME>                           6687
<REALIZED-GAINS-CURRENT>                           152
<APPREC-INCREASE-CURRENT>                        (757)
<NET-CHANGE-FROM-OPS>                             6082
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          29600
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                          283967
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              662
<INTEREST-EXPENSE>                                 524
<GROSS-EXPENSE>                                   1443
<AVERAGE-NET-ASSETS>                            272905
<PER-SHARE-NAV-BEGIN>                                0
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                  0
<EXPENSE-RATIO>                                      0


</TABLE>


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