WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862502
<NAME> Salomon Brothers Balanced Fund
<SERIES>
   <NUMBER>009
   <NAME>Salomon Brothers Investment Series Funds Inc.

<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                               Dec-31-2000
<PERIOD-END>                                    Jun-30-2000
<INVESTMENTS-AT-COST>                           133,589,299
<INVESTMENTS-AT-VALUE>                          132,994,565
<RECEIVABLES>                                     1,062,165
<ASSETS-OTHER>                                        4,530
<OTHER-ITEMS-ASSETS>                                      0
<TOTAL-ASSETS>                                  134,061,260
<PAYABLE-FOR-SECURITIES>                          7,842,358
<SENIOR-LONG-TERM-DEBT>                                   0
<OTHER-ITEMS-LIABILITIES>                         1,074,314
<TOTAL-LIABILITIES>                               8,916,672
<SENIOR-EQUITY>                                           0
<PAID-IN-CAPITAL-COMMON>                        115,794,700
<SHARES-COMMON-STOCK>                             6,224,815
<SHARES-COMMON-PRIOR>                             7,651,075
<ACCUMULATED-NII-CURRENT>                           292,308
<OVERDISTRIBUTION-NII>                                    0
<ACCUMULATED-NET-GAINS>                           9,652,314
<OVERDISTRIBUTION-GAINS>                                  0
<ACCUM-APPREC-OR-DEPREC>                           (594,734)
<NET-ASSETS>                                    125,144,588
<DIVIDEND-INCOME>                                 1,273,489
<INTEREST-INCOME>                                 2,233,173
<OTHER-INCOME>                                            0
<EXPENSES-NET>                                    1,039,838
<NET-INVESTMENT-INCOME>                           2,466,824
<REALIZED-GAINS-CURRENT>                          9,667,164
<APPREC-INCREASE-CURRENT>                        (5,975,035)
<NET-CHANGE-FROM-OPS>                             6,158,953
<EQUALIZATION>                                            0
<DISTRIBUTIONS-OF-INCOME>                         1,422,920
<DISTRIBUTIONS-OF-GAINS>                          1,566,608
<DISTRIBUTIONS-OTHER>                                     0
<NUMBER-OF-SHARES-SOLD>                              99,935
<NUMBER-OF-SHARES-REDEEMED>                       1,705,789
<SHARES-REINVESTED>                                 179,594
<NET-CHANGE-IN-ASSETS>                          (30,387,593)
<ACCUMULATED-NII-PRIOR>                             179,672
<ACCUMULATED-GAINS-PRIOR>                         2,444,191
<OVERDISTRIB-NII-PRIOR>                                   0
<OVERDIST-NET-GAINS-PRIOR>                                0
<GROSS-ADVISORY-FEES>                               409,716
<INTEREST-EXPENSE>                                        0
<GROSS-EXPENSE>                                   1,238,712
<AVERAGE-NET-ASSETS>                             86,415,856
<PER-SHARE-NAV-BEGIN>                                12.760
<PER-SHARE-NII>                                       0.220
<PER-SHARE-GAIN-APPREC>                               0.390
<PER-SHARE-DIVIDEND>                                  0.210
<PER-SHARE-DISTRIBUTIONS>                             0.250
<RETURNS-OF-CAPITAL>                                  0.000
<PER-SHARE-NAV-END>                                  12.910
<EXPENSE-RATIO>                                        1.70



</TABLE>