<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
STATEMENT OF ASSETS AND LIABILITIES, STATEMENT OF OPERATIONS, AND STATE-
MENT OF CHANGES IN NET ASSETS FOUND ON PAGES 108 THROUGH 134 OF THE FORTIS
SERIES FUND, INC. SEMI-ANNUAL SHAREHOLDER REPORT.
</LEGEND>
<CIK> 0000790558
<NAME> FORTIS SERIES FUND, INC.
<SERIES>
<NUMBER> 20
<NAME> BLUE CHIP STOCK SERIES II
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 2-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> MAY-01-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 6,624,508
<INVESTMENTS-AT-VALUE> 6,863,802
<RECEIVABLES> 55,117
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 3,371
<TOTAL-ASSETS> 6,922,290
<PAYABLE-FOR-SECURITIES> 78,169
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 7,401
<TOTAL-LIABILITIES> 85,570
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 6,623,452
<SHARES-COMMON-STOCK> 659,275
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 830
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (26,856)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 239,294
<NET-ASSETS> 6,836,720
<DIVIDEND-INCOME> 6,240
<INTEREST-INCOME> 10,064
<OTHER-INCOME> 0
<EXPENSES-NET> (15,474)
<NET-INVESTMENT-INCOME> 830
<REALIZED-GAINS-CURRENT> (26,856)
<APPREC-INCREASE-CURRENT> 239,294
<NET-CHANGE-FROM-OPS> 213,268
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 663,208
<NUMBER-OF-SHARES-REDEEMED> (3,933)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 6,836,720
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 10,828
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 17,566
<AVERAGE-NET-ASSETS> 5,876,713
<PER-SHARE-NAV-BEGIN> 10.36
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 0.02
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.37
<EXPENSE-RATIO> 1.30<F1><F2>
<FN>
<F1>ANNUALIZED.
<F2>FORTIS ADVISERS HAS VOLUNTARILY UNDERTAKEN TO LIMIT ANNUAL EXPENSES FOR
BLUE CHIP STOCK SERIES II (EXCLUSIVE OF INTEREST, TAXES, BROKERAGE COMMISSION
AND NON-RECURRING EXTRAORDINARY CHARGES AND EXPENSES) TO 1.30% OF THE AVERAGE
NET ASSETS. FOR THE PERIOD, HAD THE WAIVER AND REIMBURSMENT OF EXPENSES NOT
BEEN IN EFFECT, THE RATIO OF EXPENSES TO AVERAGE DAILY NET ASSETS WOULD HAVE
BEEN 1.52%.
</FN>
</TABLE>
