a5915319ex23

We consent to the incorporation by reference in Registration Statement Nos. 33-90854, 333-36597, 333-63706, 333-90480, 333-135473 and 333-151683 on Form S-8 and Registration Statement No. 333-140333 on Form S-3 of our reports dated March 12, 2009, relating to the consolidated financial statements of ARIAD Pharmaceuticals, Inc. and the effectiveness of ARIAD Pharmaceuticals, Inc.’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of ARIAD Pharmaceuticals, Inc. for the year ended December 31, 2008.