| Mode: | Basketball |
| Year: | 1939–40 |
| Team: | Washington State Cougars |
| Conference: | Pacific Coast Conference |
| Short Conf: | PCC |
| Record: | 23–10 |
| Conf Record: | 9–7 |
| Hc Year: | 12th |
| Bowl Result: | Runner-up |
The 1939–40 Washington State Cougars men's basketball team represented Washington State College for the college basketball season. Led by twelfth-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 overall in the regular season and in conference play, third place in Northern