<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
BIOANALYTICAL SYSTEMS, INC. CONSOLIDATED FINANCIAL STATEMENTS CONTAINED IN THE
COMPANY'S REGISTRATION STATEMENT ON FORM S-1 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   YEAR                    YEAR
<FISCAL-YEAR-END>                          SEP-30-1997             SEP-30-1996
<PERIOD-START>                             OCT-01-1996             OCT-01-1995
<PERIOD-END>                               SEP-30-1997             SEP-30-1996
<CASH>                                             161                     595
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    3,013                   1,652
<ALLOWANCES>                                         0                       0
<INVENTORY>                                      1,911                   1,932
<CURRENT-ASSETS>                                 5,342                   4,382
<PP&E>                                          12,838                   8,859
<DEPRECIATION>                                   2,803                   2,333
<TOTAL-ASSETS>                                  15,931                  11,374
<CURRENT-LIABILITIES>                            2,849                   1,323
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                     298
<PREFERRED>                                      1,231                   1,231
<COMMON>                                           498                     484
<OTHER-SE>                                       5,156                   4,472
<TOTAL-LIABILITY-AND-EQUITY>                    15,931                  11,374
<SALES>                                          9,932                   9,113
<TOTAL-REVENUES>                                14,923                  12,794
<CGS>                                            3,334                   3,227
<TOTAL-COSTS>                                    6,320                   5,368
<OTHER-EXPENSES>                                 7,431                   6,725
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 100                      81
<INCOME-PRETAX>                                  1,097                     683
<INCOME-TAX>                                       413                     283
<INCOME-CONTINUING>                                684                     400
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       657                     347
<EPS-PRIMARY>                                      .21                     .11
<EPS-DILUTED>                                      .21                     .11