<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000795422
<NAME> Fidelity Advisor Series II
<SERIES>
<NUMBER> 92
<NAME> Fidelity Advisor Mortgage Securities Fund - Class A
<MULTIPLIER> 1,000
<S>
<C>
<PERIOD-TYPE>
6-MOS
<FISCAL-YEAR-END>
OCT-31-2000
<PERIOD-END>
APR-30-2000
<INVESTMENTS-AT-COST>
463,964
<INVESTMENTS-AT-VALUE>
449,051
<RECEIVABLES>
3,653
<ASSETS-OTHER>
35
<OTHER-ITEMS-ASSETS>
0
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452,739
<PAYABLE-FOR-SECURITIES>
23,049
<SENIOR-LONG-TERM-DEBT>
0
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1,256
<TOTAL-LIABILITIES>
24,305
<SENIOR-EQUITY>
0
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450,642
<SHARES-COMMON-STOCK>
404
<SHARES-COMMON-PRIOR>
295
<ACCUMULATED-NII-CURRENT>
637
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(8,112)
<OVERDISTRIBUTION-GAINS>
0
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(14,733)
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428,434
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
16,481
<OTHER-INCOME>
0
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1,681
<NET-INVESTMENT-INCOME>
14,800
<REALIZED-GAINS-CURRENT>
(2,942)
<APPREC-INCREASE-CURRENT>
(4,704)
<NET-CHANGE-FROM-OPS>
7,154
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
118
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
150
<NUMBER-OF-SHARES-REDEEMED>
50
<SHARES-REINVESTED>
9
<NET-CHANGE-IN-ASSETS>
(45,070)
<ACCUMULATED-NII-PRIOR>
1,902
<ACCUMULATED-GAINS-PRIOR>
(5,170)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
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963
<INTEREST-EXPENSE>
0
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1,690
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3,395
<PER-SHARE-NAV-BEGIN>
10.480
<PER-SHARE-NII>
.328
<PER-SHARE-GAIN-APPREC>
(.177)
<PER-SHARE-DIVIDEND>
.361
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
10.270
<EXPENSE-RATIO>
90
</TABLE>
