<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000887589
<NAME> CREDIT SUISSE INSTITUTIONAL SERIES FUND, INC.
<SERIES>
<NUMBER> 01
<NAME> INTERNATIONAL EQUITY PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> APR-30-2000
<INVESTMENTS-AT-COST> 351285918
<INVESTMENTS-AT-VALUE> 422543845
<RECEIVABLES> 8285591
<ASSETS-OTHER> 5062
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 430834498
<PAYABLE-FOR-SECURITIES> 488662
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 551348
<TOTAL-LIABILITIES> 1040010
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 214506688
<SHARES-COMMON-STOCK> 20457707
<SHARES-COMMON-PRIOR> 29278275
<ACCUMULATED-NII-CURRENT> (4161970)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 148343686
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 71106084
<NET-ASSETS> 429794488
<DIVIDEND-INCOME> 2009460
<INTEREST-INCOME> 202228
<OTHER-INCOME> 0
<EXPENSES-NET> (2261275)
<NET-INVESTMENT-INCOME> (49587)
<REALIZED-GAINS-CURRENT> 149404394
<APPREC-INCREASE-CURRENT> (65920637)
<NET-CHANGE-FROM-OPS> 83434170
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (16548760)
<DISTRIBUTIONS-OF-GAINS> (4574109)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 178035714
<NUMBER-OF-SHARES-REDEEMED> (381816173)
<SHARES-REINVESTED> 19433416
<NET-CHANGE-IN-ASSETS> (122035742)
<ACCUMULATED-NII-PRIOR> 11949013
<ACCUMULATED-GAINS-PRIOR> 4000765
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1904232
<INTEREST-EXPENSE> 128969
<GROSS-EXPENSE> 2909312
<AVERAGE-NET-ASSETS> 478673590
<PER-SHARE-NAV-BEGIN> 18.85
<PER-SHARE-NII> .11
<PER-SHARE-GAIN-APPREC> 3.05
<PER-SHARE-DIVIDEND> (.78)
<PER-SHARE-DISTRIBUTIONS> (.22)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.01
<EXPENSE-RATIO> .98
</TABLE>