<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
this schedule contains summary financial information extracted from mason street
funds, inc. select bond fund, 03/31/00 financial statements class b.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 072
<NAME> SELECT BOND FUND CLASS B
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> MAR-31-2000
<INVESTMENTS-AT-COST> 36845798
<INVESTMENTS-AT-VALUE> 34377326
<RECEIVABLES> 1726427
<ASSETS-OTHER> 103436
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 36207189
<PAYABLE-FOR-SECURITIES> 1506077
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 35138
<TOTAL-LIABILITIES> 1541215
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 37729073
<SHARES-COMMON-STOCK> 249571
<SHARES-COMMON-PRIOR> 251171
<ACCUMULATED-NII-CURRENT> 3918
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (600795)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2466222)
<NET-ASSETS> 34665974
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2590074
<OTHER-INCOME> 0
<EXPENSES-NET> 303372
<NET-INVESTMENT-INCOME> 2286702
<REALIZED-GAINS-CURRENT> (283558)
<APPREC-INCREASE-CURRENT> (1245539)
<NET-CHANGE-FROM-OPS> (1529097)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 154885
<DISTRIBUTIONS-OF-GAINS> 29176
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 83972
<NUMBER-OF-SHARES-REDEEMED> 103728
<SHARES-REINVESTED> 18156
<NET-CHANGE-IN-ASSETS> 762104
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 91244
<OVERDISTRIB-NII-PRIOR> 10530
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 102994
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 447158
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 9.66
<PER-SHARE-NII> 0.60
<PER-SHARE-GAIN-APPREC> (0.46)
<PER-SHARE-DIVIDEND> 0.57
<PER-SHARE-DISTRIBUTIONS> 0.11
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.12
<EXPENSE-RATIO> 1.50
</TABLE>
