1930–31 Washington State Cougars men's basketball team

The 1930–31 Washington State Cougars men's basketball team represented Washington State College for the 1930–31 college basketball season. Led by third-year head coach Jack Friel, the Cougars were members of the Pacific Coast Conference and played their home games on campus at WSC Gymnasium in Pullman, Washington.

The Cougars were 18–7 overall in the regular season and 10–6 in conference play, second in the Northern division.