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 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.

They defeated Washington in the first round of the Pac-12 tournament before losing in the quarterfinals to USC.