<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862501
<NAME> SALOMON BROTHERS INSTITUTIONAL SERIES FUNDS
<SERIES>
   <NUMBER> 3
   <NAME> INSTITUTIONAL EMERGING MARKET DEBT FUND

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          FEB-28-2000
<PERIOD-END>                               AUG-31-1999
<INVESTMENTS-AT-COST>                       39,090,149
<INVESTMENTS-AT-VALUE>                      39,819,847
<RECEIVABLES>                                8,173,476
<ASSETS-OTHER>                                  30,488
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              48,023,488
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       38,559
<TOTAL-LIABILITIES>                             38,559
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    53,238,982
<SHARES-COMMON-STOCK>                        8,552,246
<SHARES-COMMON-PRIOR>                        6,162,939
<ACCUMULATED-NII-CURRENT>                    2,926,886
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (8,910,314)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       729,698
<NET-ASSETS>                                47,985,252
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            2,502,885
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 150,398
<NET-INVESTMENT-INCOME>                      2,352,487
<REALIZED-GAINS-CURRENT>                     1,108,424
<APPREC-INCREASE-CURRENT>                      908,447
<NET-CHANGE-FROM-OPS>                        4,369,358
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,581,133
<NUMBER-OF-SHARES-REDEEMED>                    191,826
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      17,461,894
<ACCUMULATED-NII-PRIOR>                        574,399
<ACCUMULATED-GAINS-PRIOR>                 (10,018,738)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           11,356
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                198,463
<AVERAGE-NET-ASSETS>                        39,534,365
<PER-SHARE-NAV-BEGIN>                             4.95
<PER-SHARE-NII>                                   0.33
<PER-SHARE-GAIN-APPREC>                           0.33
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               5.61
<EXPENSE-RATIO>                                   0.75


</TABLE>