The 2003 Washington State Cougars football team represented Washington State University as a member of Pacific-10 Conference during the 2003 NCAA Division I-A football season. Led by first-year head coach Bill Doba, the Cougars compiled an overall record of 10–3 with a mark of 6–2 in conference play, finished second in the Pac-10 behind champion USC. Washington State was invited to the Holiday Bowl in San Diego, where the Cougars defeated fifth-ranked Texas and moved up to ninth in the final rankings. The team played home games on campus at Martin Stadium in Pullman, Washington.

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