Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-75632 and 333-47564) and Form S-8 (Nos. 333-155564; 333-149017; 333-143231; 333-134519; 333-116632; 333-101983; 333-73700; 333-68074; 333-56373; 333-32547; 333-26045; 333-07177; 033-55123; and 33-42352) of Teradyne, Inc. of our report dated March 2, 2009 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/PricewaterhouseCoopers LLP

Boston, Massachusetts

March 2, 2009