<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEET AT DECEMBER 31, 1999 AND THE CONDENSED
CONSOLIDATED STATEMENT OF INCOME FOR THE YEAR ENDED DECEMBER 31, 1999 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS
</LEGEND>
<CIK> 0000097210
<NAME> TERADYNE, INC.
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<EXCHANGE-RATE>                                      1
<CASH>                                         181,345
<SECURITIES>                                    66,316
<RECEIVABLES>                                  300,569
<ALLOWANCES>                                     4,410
<INVENTORY>                                    268,693
<CURRENT-ASSETS>                               907,687
<PP&E>                                         981,986
<DEPRECIATION>                                 484,247
<TOTAL-ASSETS>                               1,568,213
<CURRENT-LIABILITIES>                          392,326
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        21,290
<OTHER-SE>                                   1,131,742
<TOTAL-LIABILITY-AND-EQUITY>                 1,568,213
<SALES>                                      1,790,912
<TOTAL-REVENUES>                             1,790,912
<CGS>                                        1,047,752
<TOTAL-COSTS>                                1,532,714
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,656
<INCOME-PRETAX>                                273,849
<INCOME-TAX>                                    82,155
<INCOME-CONTINUING>                            191,694
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   191,694
<EPS-BASIC>                                       1.12
<EPS-DILUTED>                                     1.07