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. 333-166529) and Form S-8 (Nos. 333-174241, 333-159391, 333-129836, 333-115942, 333-98415, 333-49802, and 333-91179) of Lionbridge Technologies, Inc. of our report dated March 15, 2013 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Boston, Massachusetts

March 15, 2013