(1)

Form S-3 No. 333-148838, of Rigel Pharmaceuticals, Inc.

(2)

Form S-3 No. 333-129650, of Rigel Pharmaceuticals, Inc.

(3)

Form S-8 No. 333-148132, pertaining to the 2000 Equity Incentive Plan, 2000 Employee Stock Purchase Plan and 2000 Non-Employee Directors’ Stock Option Plan of Rigel Pharmaceuticals, Inc.

(4)

Form S-8 No. 333-139516, pertaining to the 2000 Employee Stock Purchase Plan of Rigel Pharmaceuticals Inc.

(5)

Form S-8 No. 333-134622, pertaining to the 2000 Equity Incentive Plan, 2000 Employee Stock Purchase Plan and 2000 Non-Employee Directors’ Stock Option Plan of Rigel Pharmaceuticals, Inc.

(6)

Form S-8 No. 333-125895, pertaining to the 2000 Equity Incentive Plan, 2000 Employee Stock Purchase Plan and 2000 Non-Employee Directors’ Stock Option Plan of Rigel Pharmaceuticals, Inc.

(7)

Form S-8 No. 333-111782, pertaining to the 2000 Equity Incentive Plan of Rigel Pharmaceuticals, Inc.

(8)

Form S-8 No. 333-107062, pertaining to the 2000 Employee Stock Purchase Plan of Rigel Pharmaceuticals, Inc.

(9)

Form S-8 No. 333-106532, pertaining to the 2000 Equity Incentive Plan, 2000 Employee Stock Purchase Plan and 2000 Non-Employee Directors’ Stock Option Plan of Rigel Pharmaceuticals, Inc.

(10)

Form S-8 No. 333-72492, pertaining to the 2001 Non-Officer Equity Incentive Plan of Rigel Pharmaceuticals, Inc.

(11)

Form S-8 No. 333-51184, pertaining to the 2000 Equity Incentive Plan, 2000 Employee Stock Purchase Plan and 2000 Non-Employee Directors’ Stock Option Plan of Rigel Pharmaceuticals, Inc.

in each case for the registration of shares of Rigel Pharmceuticals, Inc’s common stock, and in the related prospectuses, as applicable, contained in such Registration Statements of our report dated August 4, 2009 relating to the unaudited condensed interim financial statements of Rigel Pharmaceuticals, Inc. that are included in its Form 10-Q for the quarter ended June 30, 2009.

/s/ Ernst & Young LLP

Palo Alto, California