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-8 (Nos. 333-118260, 333-104083, 333-55820, 333-31636 and 333-52661) of Mettler-Toledo International Inc. of our report dated February 12, 2009 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/  PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Columbus, Ohio

February 12, 2009