The 2021 Pac-12 Conference men's basketball tournament was a postseason men's basketball tournament for the Pac-12 Conference, which was played March 10–13, 2021, at T-Mobile Arena on the Las Vegas Strip in Paradise, Nevada. The winner was Oregon State, which was the first for the Beavers in the history of the tournament. They received the conference's automatic bid to the 2021 NCAA Division I men's basketball tournament. The 2020 Tournament had been cancelled after the first round due to the Covid-19 pandemic. The 2021 tournament was played, but with only family of student-athletes as spectators in attendance.