SEI INDEX FUNDS
NSAR-B, 1998-05-29
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<PAGE>      PAGE  1
000 B000000 03/31/98
000 C000000 0000766589
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 SEI INDEX FUNDS
001 B000000 811-4283
001 C000000 8003425734
002 A000000 2 OLIVER STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02109
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  2
007 C010100  1
007 C020100 S&P 500 INDEX PORTFOLIO
007 C030100 N
007 C010200  2
007 C020200 BOND INDEX PORTFOLIO
007 C030200 N
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
010 A00AA01 SEI FUND MANAGEMENT
010 C01AA01 WAYNE
010 C02AA01 PA
010 C03AA01 19087
010 C04AA01 1658
011 A00AA01 SEI INVESTMENTS DISTRIBUTION CO.
011 B00AA01 8-0000
011 C01AA01 WAYNE
011 C02AA01 PA
011 C03AA01 19087
011 C04AA01 1658
012 A00AA01 SEI FUND MANAGEMENT
012 B00AA01 84-0000
012 C01AA01 WAYNE
012 C02AA01 PA
<PAGE>      PAGE  2
012 C03AA01 19087
012 C04AA01 1658
015 A00AA01 COMERICA BANK
015 B00AA01 C
015 C01AA01 DETROIT
015 C02AA01 MI
015 C03AA01 48226
015 E01AA01 X
020 A000001 PAINE WEBBER
020 B000001 13-2760086
020 C000001     25
020 A000002 MORGAN STANLEY
020 B000002 13-2655998
020 C000002     11
020 A000003 NAT WEST
020 C000003      9
020 A000004 WORLD ASSET
020 C000004      7
020 A000005 J.P. MORGAN
020 B000005 13-3224016
020 C000005      5
020 A000006 CANTOR FITZ
020 B000006 13-3680184
020 C000006      5
020 A000007 INSTINET
020 B000007 13-3443395
020 C000007      5
020 A000008 MERRILL LYNCH
020 B000008 13-5674085
020 C000008      2
020 A000009 EXECUTION SERVICES
020 B000009 13-2862329
020 C000009      2
020 A000010 SMITH BARNEY
020 B000010 13-1912900
020 C000010      1
021  000000       90
022 A000001 J.P. MORGAN
022 B000001 13-3224016
022 C000001    429298
022 D000001    438809
022 A000002 NAT WEST
022 C000002    140314
022 D000002         0
022 A000003 PAINE WEBBER
022 B000003 13-2760086
022 C000003     45080
022 D000003      3210
022 A000004 SMITH BARNEY
022 B000004 13-2518466
022 C000004     19812
<PAGE>      PAGE  3
022 D000004     18499
022 A000005 NATIONAL FINANCIAL
022 C000005     33848
022 D000005         0
022 A000006 WORLD ASSET
022 C000006         0
022 D000006     18723
022 A000007 LEHMAN BROTHERS
022 B000007 13-2927667
022 C000007      3377
022 D000007      3264
022 A000008 BEAR STEARNS
022 B000008 13-2975144
022 C000008      3411
022 D000008      3229
022 A000009 MORGAN STANLEY
022 B000009 13-2655998
022 C000009      1892
022 D000009      1645
022 A000010 CANTOR FITZ
022 B000010 13-3680184
022 C000010      3320
022 D000010         0
023 C000000     714468
023 D000000     496781
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 Y
029  00AA00 N
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039  00AA00 N
040  00AA00 Y
041  00AA00 Y
049  00AA00 N
050  00AA00 N
051  00AA00 N
052  00AA00 N
<PAGE>      PAGE  4
053 A00AA00 N
054 A00AA00 Y
054 B00AA00 N
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 N
054 N00AA00 N
054 O00AA00 N
055 A00AA00 N
055 B00AA00 N
056  00AA00 Y
057  00AA00 N
058 A00AA00 N
059  00AA00 Y
061  00AA00        0
077 A000000 Y
077 B000000 Y
080 A00AA00 CONTINENTAL CASUALTY COMPANY
080 B00AA00 RELIANCE INSURANCE COMPANY
080 C00AA00    53000
081 A00AA00 Y
081 B00AA00 330
082 A00AA00 N
082 B00AA00        0
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
008 A000101 WORLD ASSET MANAGEMENT
008 B000101 A
008 C000101 801-0000
008 D010101 DETROIT
008 D020101 MI
008 D030101 48275
008 D040101 3040
024  000100 Y
025 A000101 J.P. MORGAN
025 B000101 13-3224016
025 C000101 E
025 D000101    4786
025 A000102 LEHMAN BROTHERS
<PAGE>      PAGE  5
025 B000102 13-2927667
025 C000102 E
025 D000102    1535
025 A000103 MERRILL LYNCH
025 B000103 13-5674085
025 C000103 E
025 D000103    5553
025 A000104 MORGAN STANLEY
025 B000104 13-2655998
025 C000104 E
025 D000104    8669
025 A000105 J.P. MORGAN
025 B000105 13-3224016
025 C000105 D
025 D000105   30405
025 D000106       0
025 D000107       0
025 D000108       0
028 A010100     56016
028 A020100      3098
028 A030100         0
028 A040100     51474
028 B010100     33598
028 B020100         0
028 B030100         0
028 B040100     15644
028 C010100     79168
028 C020100      6848
028 C030100         0
028 C040100     54152
028 D010100     80340
028 D020100      3198
028 D030100         0
028 D040100     47096
028 E010100     68727
028 E020100         0
028 E030100         0
028 E040100     36666
028 F010100     85265
028 F020100         0
028 F030100         0
028 F040100     48930
028 G010100    403114
028 G020100     13144
028 G030100         0
028 G040100    253962
028 H000100         0
042 A000100   0
042 B000100   0
042 C000100   0
042 D000100   0
<PAGE>      PAGE  6
042 E000100 100
042 F000100   0
042 G000100   0
042 H000100   0
043  000100    378
044  000100      0
045  000100 Y
046  000100 N
047  000100 Y
048  000100  0.030
048 A010100        0
048 A020100 0.000
048 B010100        0
048 B020100 0.000
048 C010100        0
048 C020100 0.000
048 D010100        0
048 D020100 0.000
048 E010100        0
048 E020100 0.000
048 F010100        0
048 F020100 0.000
048 G010100        0
048 G020100 0.000
048 H010100        0
048 H020100 0.000
048 I010100        0
048 I020100 0.000
048 J010100        0
048 J020100 0.000
048 K010100        0
048 K020100 0.000
062 A000100 N
062 B000100   0.0
062 C000100   0.0
062 D000100   0.0
062 E000100   0.0
062 F000100   0.0
062 G000100   0.0
062 H000100   0.0
062 I000100   0.0
062 J000100   0.0
062 K000100   0.0
062 L000100   0.0
062 M000100   0.0
062 N000100   0.0
062 O000100   0.0
062 P000100   0.0
062 Q000100   0.0
062 R000100   0.0
066 A000100 Y
<PAGE>      PAGE  7
066 B000100 N
066 C000100 Y
066 D000100 N
066 E000100 N
066 F000100 N
066 G000100 N
067  000100 N
068 A000100 N
068 B000100 N
069  000100 Y
071 A000100    388696
071 B000100     45966
071 C000100   1288426
071 D000100    4
072 A000100 12
072 B000100     2458
072 C000100    21406
072 D000100        0
072 E000100        0
072 F000100      399
072 G000100     2924
072 H000100        0
072 I000100     2691
072 J000100      209
072 K000100        0
072 L000100       56
072 M000100       20
072 N000100      105
072 O000100        0
072 P000100        0
072 Q000100        0
072 R000100       32
072 S000100       25
072 T000100      378
072 U000100        0
072 V000100        0
072 W000100       73
072 X000100     6912
072 Y000100     3211
072 Z000100    20163
072AA000100    25776
072BB000100        0
072CC010100   461338
072CC020100        0
072DD010100    19320
072DD020100        0
072EE000100     9993
073 A010100   0.4500
073 A020100   0.4100
073 B000100   0.2100
073 C000100   0.0000
<PAGE>      PAGE  8
074 A000100        0
074 B000100    30405
074 C000100     3201
074 D000100        0
074 E000100        0
074 F000100  1719623
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100        0
074 K000100        0
074 L000100        0
074 M000100        0
074 N000100  1753229
074 O000100        0
074 P000100        0
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100     1228
074 S000100        0
074 T000100  1752001
074 U010100    37414
074 U020100    12994
074 V010100    34.77
074 V020100    34.71
074 W000100   0.0000
074 X000100      481
074 Y000100     3201
075 A000100        0
075 B000100  1328796
076  000100     0.00
008 A000201 MELLON BOND ASSOCIATES
008 B000201 A
008 C000201 801-0000
008 D010201 PHILADELPHIA
008 D020201 PA
008 D030201 19101
024  000200 Y
025 A000201 J.P. MORGAN
025 B000201 13-3224016
025 C000201 E
025 D000201     188
025 A000202 LEHMAN BROTHERS
025 B000202 13-2927667
025 C000202 D
025 D000202    1488
025 D000203       0
025 D000204       0
025 D000205       0
<PAGE>      PAGE  9
025 D000206       0
025 D000207       0
025 D000208       0
028 A010200      2039
028 A020200         0
028 A030200         0
028 A040200      1070
028 B010200      1207
028 B020200        60
028 B030200         0
028 B040200      1456
028 C010200      1390
028 C020200        61
028 C030200         0
028 C040200      1081
028 D010200      1652
028 D020200        63
028 D030200         0
028 D040200      2485
028 E010200      3812
028 E020200        57
028 E030200         0
028 E040200      2201
028 F010200      2198
028 F020200       103
028 F030200         0
028 F040200      1204
028 G010200     12298
028 G020200       344
028 G030200         0
028 G040200      9497
028 H000200         0
042 A000200   0
042 B000200   0
042 C000200   0
042 D000200   0
042 E000200 100
042 F000200   0
042 G000200   0
042 H000200   0
043  000200      0
044  000200      0
045  000200 Y
046  000200 N
047  000200 Y
048  000200  0.070
048 A010200        0
048 A020200 0.000
048 B010200        0
048 B020200 0.000
048 C010200        0
<PAGE>      PAGE  10
048 C020200 0.000
048 D010200        0
048 D020200 0.000
048 E010200        0
048 E020200 0.000
048 F010200        0
048 F020200 0.000
048 G010200        0
048 G020200 0.000
048 H010200        0
048 H020200 0.000
048 I010200        0
048 I020200 0.000
048 J010200        0
048 J020200 0.000
048 K010200        0
048 K020200 0.000
062 A000200 Y
062 B000200   0.0
062 C000200   0.3
062 D000200   3.4
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
062 L000200   0.0
062 M000200  39.7
062 N000200  36.9
062 O000200   0.0
062 P000200  16.8
062 Q000200   4.0
062 R000200   0.0
063 A000200   0
063 B000200 10.7
066 A000200 N
067  000200 N
068 A000200 N
068 B000200 N
069  000200 Y
071 A000200     22383
071 B000200     16742
071 C000200     37939
071 D000200   44
072 A000200 12
072 B000200     2587
072 C000200        0
072 D000200        0
072 E000200        0
<PAGE>      PAGE  11
072 F000200       27
072 G000200      137
072 H000200        0
072 I000200       98
072 J000200        6
072 K000200        0
072 L000200       30
072 M000200        1
072 N000200        3
072 O000200        0
072 P000200        0
072 Q000200        0
072 R000200        0
072 S000200        1
072 T000200        0
072 U000200        0
072 V000200        0
072 W000200        3
072 X000200      306
072 Y000200      157
072 Z000200     2438
072AA000200      210
072BB000200        0
072CC010200     1636
072CC020200        0
072DD010200     2438
072DD020200        0
072EE000200        0
073 A010200   0.6400
073 A020200   0.0000
073 B000200   0.0000
073 C000200   0.0000
074 A000200        0
074 B000200     1488
074 C000200      141
074 D000200    42134
074 E000200        0
074 F000200        0
074 G000200        0
074 H000200        0
074 I000200        0
074 J000200        0
074 K000200        0
074 L000200      655
074 M000200        0
074 N000200    44418
074 O000200     1003
074 P000200        0
074 Q000200        0
074 R010200        0
074 R020200        0
<PAGE>      PAGE  12
074 R030200        0
074 R040200      133
074 S000200        0
074 T000200    43282
074 U010200     4116
074 U020200        0
074 V010200    10.52
074 V020200     0.00
074 W000200   0.0000
074 X000200      111
074 Y000200        0
075 A000200        0
075 B000200    39217
076  000200     0.00
SIGNATURE   MARK NAGLE                                   
TITLE       CONTROLLER          
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000766589
<NAME> SEI INDEX FUNDS
<SERIES>
   <NUMBER> 011
   <NAME> S&P 500 CLASS A
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               MAR-31-1998
<INVESTMENTS-AT-COST>                          1002130
<INVESTMENTS-AT-VALUE>                         1753229
<RECEIVABLES>                                        0
<ASSETS-OTHER>                                       0
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<OTHER-ITEMS-LIABILITIES>                         1228
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        355201
<SHARES-COMMON-STOCK>                            12994
<SHARES-COMMON-PRIOR>                             4521
<ACCUMULATED-NII-CURRENT>                         5065
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          19161
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<NET-CHANGE-FROM-OPS>                           507277
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (3067)
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<NUMBER-OF-SHARES-SOLD>                           9710
<NUMBER-OF-SHARES-REDEEMED>                     (1408)
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<ACCUMULATED-NII-PRIOR>                           4335
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<EXPENSE-RATIO>                                    .40
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000766589
<NAME> SEI INDEX FUNDS
<SERIES>
   <NUMBER> 012
   <NAME> S&P 500 CLASS E
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
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<PERIOD-START>                             APR-01-1997
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<INVESTMENTS-AT-COST>                          1002130
<INVESTMENTS-AT-VALUE>                         1753229
<RECEIVABLES>                                        0
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 1753229
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<EQUALIZATION>                                       0
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<NUMBER-OF-SHARES-REDEEMED>                    (12483)
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<AVERAGE-NET-ASSETS>                           1076459
<PER-SHARE-NAV-BEGIN>                            24.10
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<PER-SHARE-GAIN-APPREC>                          10.88
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              34.77
<EXPENSE-RATIO>                                    .25
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000766589
<NAME> SEI INDEX FUNDS
<SERIES>
   <NUMBER> 020
   <NAME> BOND INDEX
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<S>                             <C>
<PERIOD-TYPE>                   YEAR
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<EQUALIZATION>                                       0
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<PER-SHARE-NII>                                    .64
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<PER-SHARE-DIVIDEND>                             (.64)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.52
<EXPENSE-RATIO>                                    .38
<AVG-DEBT-OUTSTANDING>                               0
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</TABLE>

REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Trustees of
SEI Index Funds:

In planning and performing our audit of the financial statements of SEI Index 
Funds for the year ended March 31, 1998, we considered its internal controls, 
including control activities for safeguarding securities, in order to 
determine our auditing procedures for the purpose of expressing our opinion 
on the financial statements and to comply with the requirements of Form 
N-SAR, not to provide assurance on internal controls. 

The management of SEI Index Funds is responsible for establishing and 
maintaining internal controls.  In fulfilling this responsibility, estimates 
and judgments by management are required to assess the expected benefits and 
related costs of control activities.  Generally, control activities that are 
relevant to an audit pertain to the entity's objective of preparing financial
statements for external purposes that are fairly presented in conformity with
generally accepted accounting principles.  Those control activities include the
safeguarding of assets against unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal controls, errors or 
irregularities may occur and not be detected.  Also, projection of any 
evaluation of internal control to future periods is subject to the risk that 
it may become inadequate because of changes in conditions or that the 
effectiveness of the design and operation may deteriorate.

Our consideration of internal controls would not necessarily disclose all 
matters in internal controls that might be material weaknesses under 
standards established by the American Institute of Certified Public 
Accountants.  A material weakness is a condition in which the design or 
operation of any specific internal control components does not reduce to a 
relatively low level the risk that errors or irregularities in amounts that 
would be material in relation to the financial statements being audited may 
occur and not be detected within a timely period by employees in the normal
course of performing their assigned functions.  However, we noted no matters
involving internal control, including control activities for safeguarding
securities, that we consider to be material weaknesses as defined above as of
March 31, 1998.

This report is intended solely for the information and use of management, the
Board of Trustees and the Securities and Exchange Commission.


ARTHUR ANDERSEN LLP

Philadelphia, PA
May 8, 1998






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