<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000719269
<NAME> MFS/SUN LIFE SERIES TRUST
<SERIES>
<NUMBER> 16
<NAME> GLOBAL ASSET ALLOCATION SERIES
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 115004644
<INVESTMENTS-AT-VALUE> 124866999
<RECEIVABLES> 2275510
<ASSETS-OTHER> 1593
<OTHER-ITEMS-ASSETS> 6471619
<TOTAL-ASSETS> 133615721
<PAYABLE-FOR-SECURITIES> 1032733
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 7125225
<TOTAL-LIABILITIES> 8157958
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 103649126
<SHARES-COMMON-STOCK> 7978878
<SHARES-COMMON-PRIOR> 7725899
<ACCUMULATED-NII-CURRENT> 1965557
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 9953131
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9889949
<NET-ASSETS> 125457763
<DIVIDEND-INCOME> 879343
<INTEREST-INCOME> 1774484
<OTHER-INCOME> (49857)
<EXPENSES-NET> (548260)
<NET-INVESTMENT-INCOME> 2055710
<REALIZED-GAINS-CURRENT> 10174066
<APPREC-INCREASE-CURRENT> (8970393)
<NET-CHANGE-FROM-OPS> 3259383
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (5541581)
<DISTRIBUTIONS-OF-GAINS> (959983)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 395690
<NUMBER-OF-SHARES-REDEEMED> (577598)
<SHARES-REINVESTED> 434887
<NET-CHANGE-IN-ASSETS> 384080
<ACCUMULATED-NII-PRIOR> 5451428
<ACCUMULATED-GAINS-PRIOR> 739048
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 464198
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 548260
<AVERAGE-NET-ASSETS> 123791846
<PER-SHARE-NAV-BEGIN> 16.19
<PER-SHARE-NII> 0.27
<PER-SHARE-GAIN-APPREC> 0.12
<PER-SHARE-DIVIDEND> (0.73)
<PER-SHARE-DISTRIBUTIONS> (0.13)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.72
<EXPENSE-RATIO> 0.89
</TABLE>
