1985–86 Washington State Cougars men's basketball team

The 1985–86 Washington State Cougars men's basketball team represented Washington State University for the 1985–86 NCAA Division I men's basketball season. Led by third-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 15–16 overall in the regular season and 8–10 in conference play, tied for fifth in the standings. There was no conference tournament this season; it debuted the following year.