<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM MCDERMOTT
INTERNATIONAL'S MARCH 31, 1999 FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                         181,503
<SECURITIES>                                    55,646
<RECEIVABLES>                                  514,404
<ALLOWANCES>                                    67,584
<INVENTORY>                                    231,966
<CURRENT-ASSETS>                             1,375,366
<PP&E>                                       1,460,639
<DEPRECIATION>                               1,026,678
<TOTAL-ASSETS>                               4,305,520
<CURRENT-LIABILITIES>                        1,266,411
<BONDS>                                        323,774
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        61,148
<OTHER-SE>                                     732,586
<TOTAL-LIABILITY-AND-EQUITY>                 4,305,520
<SALES>                                      3,149,985
<TOTAL-REVENUES>                             3,149,985
<CGS>                                        2,958,858
<TOTAL-COSTS>                                2,958,858
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              63,262
<INCOME-PRETAX>                                187,278
<INCOME-TAX>                                   (4,803)
<INCOME-CONTINUING>                            192,081
<DISCONTINUED>                                       0
<EXTRAORDINARY>                               (38,719)
<CHANGES>                                            0
<NET-INCOME>                                   153,362
<EPS-BASIC>                                       2.60
<EPS-DILUTED>                                     2.53