1984–85 Washington State Cougars men's basketball team

The 1984–85 Washington State Cougars men's basketball team represented Washington State University for the 1984–85 NCAA Division I men's basketball season. Led by second-year head coach Len Stevens, 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 5–13 in conference play, tied for eighth in the standings. There was no conference tournament this season; it debuted two years later.