<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>                   9-MOS                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997             SEP-30-1996
<PERIOD-START>                             OCT-01-1996             OCT-01-1995
<PERIOD-END>                               JUN-30-1997             SEP-30-1996
<CASH>                                             241                     595
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    2,550                   1,652
<ALLOWANCES>                                         0                       0
<INVENTORY>                                      2,088                   1,932
<CURRENT-ASSETS>                                 5,092                   4,382
<PP&E>                                          11,410                   8,812
<DEPRECIATION>                                   2,777                   2,333
<TOTAL-ASSETS>                                  14,423                  11,374
<CURRENT-LIABILITIES>                            1,730                   1,323
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                     298
<PREFERRED>                                      1,231                   1,231
<COMMON>                                           498                     484
<OTHER-SE>                                       5,143                   4,472
<TOTAL-LIABILITY-AND-EQUITY>                    14,423                  11,374
<SALES>                                          7,347                   9,113
<TOTAL-REVENUES>                                11,038                  12,794
<CGS>                                            2,268                   3,227
<TOTAL-COSTS>                                    4,425                   5,368
<OTHER-EXPENSES>                                 5,414                   6,725
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  69                      81
<INCOME-PRETAX>                                  1,141                     683
<INCOME-TAX>                                       470                     283
<INCOME-CONTINUING>                                671                     400
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       644                     347
<EPS-PRIMARY>                                      .21                     .11
<EPS-DILUTED>                                      .21                     .11