<ARTICLE>                     5
<LEGEND>
    This schedule  contains summary  financial  information  extracted from the
condensed  consolidated  balance  sheet  at  July   4,  1999  and the  condensed
consolidated statement of income  for  the six months  ended July 4, 1999 and is
qualified in its entirety by reference to such financial staements.
</LEGEND>
<CIK>          0000097210
<NAME>         Teradyne, Inc.
<MULTIPLIER>                                   1,000
<CURRENCY>                                     U.S. Dollars

                             
<PERIOD-TYPE>                  6-Mos
<FISCAL-YEAR-END>                              DEC-31-1999
<PERIOD-START>                                 JAN-01-1999
<PERIOD-END>                                   JUL-04-1999
<EXCHANGE-RATE>                                1.00
<CASH>                                         143,285
<SECURITIES>                                   103,316
<RECEIVABLES>                                  287,762
<ALLOWANCES>                                   2,949
<INVENTORY>                                    257,157
<CURRENT-ASSETS>                               874,761
<PP&E>                                         905,884
<DEPRECIATION>                                 457,418
<TOTAL-ASSETS>                                 1,450,504
<CURRENT-LIABILITIES>                          326,312
<BONDS>                                        0
<PREFERRED-MANDATORY>                          0
<PREFERRED>                                    0
<COMMON>                                       21,331
<OTHER-SE>                                     1,072,329
<TOTAL-LIABILITY-AND-EQUITY>                   1,450,504
<SALES>                                        745,358
<TOTAL-REVENUES>                               745,358
<CGS>                                          456,798
<TOTAL-COSTS>                                  675,218
<OTHER-EXPENSES>                               0
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                             904
<INCOME-PRETAX>                                76,856
<INCOME-TAX>                                   23,057
<INCOME-CONTINUING>                            53,799
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   53,799
<EPS-BASIC>                                  0.32
<EPS-DILUTED>                                  0.30