WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
[DESCRIPTION] FDS JANUS FUND
[TEXT]
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 2000 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<CIK> 0000277751
<NAME> JANUS FUND
<SERIES>
<NUMBER> 001
<NAME> JANUS FUND
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-START> NOV-01-1999
<PERIOD-END> OCT-31-2000
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 32,636,174
<INVESTMENTS-AT-VALUE> 46,556,265
<RECEIVABLES> 332,328
<ASSETS-OTHER> 21,789
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 46,910,382
<PAYABLE-FOR-SECURITIES> 363,969
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 78,666
<TOTAL-LIABILITIES> 442,635
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 28,064,163
<SHARES-COMMON-STOCK> 1,056,100
<SHARES-COMMON-PRIOR> 837,703
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,463,616
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 13,939,968
<NET-ASSETS> 46,467,747
<DIVIDEND-INCOME> 147,080
<INTEREST-INCOME> 147,549
<OTHER-INCOME> 0
<EXPENSES-NET> 378,244
<NET-INVESTMENT-INCOME> (83,615)
<REALIZED-GAINS-CURRENT> 4,876,094
<APPREC-INCREASE-CURRENT> 742,125
<NET-CHANGE-FROM-OPS> 5,534,604
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (4,451,206)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 265,999
<NUMBER-OF-SHARES-REDEEMED> (150,373)
<SHARES-REINVESTED> 102,771
<NET-CHANGE-IN-ASSETS> 10,633,017
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 4,444,420
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 293,095
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 383,692
<AVERAGE-NET-ASSETS> 45,103,049
<PER-SHARE-NAV-BEGIN> 42.780
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> 6.440
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (5.220)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 44.000
<EXPENSE-RATIO> 0.850
</TABLE>
