Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 333-11097 and 333-67208) on Form S-8 of Mitcham Industries, Inc. of our report dated April 16, 2007, relating to the consolidated financial statements, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

Hein & Associates LLP
Certified Public Accountants
Houston, Texas

April 16, 2007