| Mode: | Basketball |
| Year: | 1964–65 |
| Team: | Washington State Cougars |
| Conference: | Athletic Association of Western Universities |
| Short Conf: | AAWU, Pac-8 |
| Record: | 9–17 |
| Conf Record: | 6–8 |
| Hc Year: | 7th |
The 1964–65 Washington State Cougars men's basketball team represented Washington State University for the 1964–65 NCAA college basketball season. Led by seventh-year head coach Marv Harshman, the Cougars were members of the Athletic Association of Western Universities (AAWU, Pac-8) and played their home games on campus at Bohler Gymnasium in Pullman, Washington.
The Cougars were overall in the regular season and in conference play, fifth in the