The 2018–19 Oregon State Beavers men's basketball team represented Oregon State University in the 2018–19 NCAA Division I men's basketball season. The Beavers, led by fifth-year head coach Wayne Tinkle, played their home games at Gill Coliseum in Corvallis, Oregon as members of the Pac-12 Conference. They finished the season 18–13, 10–8 in Pac-12 play to finish in a three way tie for fourth place. They lost in the quarterfinals of the Pac-12 tournament to Colorado. Despite having 18 wins and a winning conference record they failed to get an invitation to the National Invitation Tournament and also ruled out of the College Basketball Invitational.