The 2019–20 Oregon State Beavers men's basketball team represented Oregon State University in the 2019–20 NCAA Division I men's basketball season.

The Beavers were led by sixth-year head coach Wayne Tinkle, and played their home games at Gill Coliseum in Corvallis, Oregon as members of the Pac-12 Conference.

They defeated Utah in the first round of the Pac-12 tournament and were set to take on rival Oregon in the quarterfinals before the remainder of the Pac-12 Tournament was cancelled amid the COVID-19 pandemic.

The 2017–18 Beavers finished the 2018–19 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.