The 2021 Mountain West Conference men's basketball tournament was the postseason men's basketball tournament for the Mountain West Conference.
It was held on March 10–13, 2021 at the Thomas & Mack Center on the campus of University of Nevada, Las Vegas, in Las Vegas, Nevada.
All 11 MW schools were eligible to participate in the tournament.
The top five teams received byes into the tournament quarterfinals.
Tie-breaking procedures remained unchanged from the 2020 tournament.