2003–04 Washington State Cougars men's basketball team

The 2003–04 Washington State Cougars men's basketball team represented Washington State University for the 2003–04 NCAA Division I men's basketball season. Led by third-year head coach Dick Bennett, the Cougars were members of the Pacific-10 Conference and played their home games on campus at Beasley Coliseum in Pullman, Washington.

The Cougars were 13–15 overall in the regular season and 7–11 in conference play, tied for seventh in the standings.

Seeded eighth in the conference tournament, the Cougars met top seed and second-ranked Stanford in the quarterfinal round and lost by 21 points.

Bennett was hired in March 2003; he was formerly the head coach at Wisconsin.

Postseason result
!colspan=5 style=| Pacific-10 Tournament