| Year: | 2021 |
| Conference: | Mountain West Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 11 |
| Arena: | Thomas & Mack Center |
| City: | Paradise, Nevada |
| Champions: | San Diego State |
| Titlecount: | 6th |
| Coach: | Brian Dutcher |
| Coachcount: | 2nd |
| Mvp: | Matt Mitchell |
| Mvpteam: | San Diego State |
| Television: | Stadium/MWN, CBSSN, CBS |
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. The tournament champion, San Diego State, received the Mountain West's automatic bid to the NCAA tournament.
All 11 MW schools were eligible to participate in the tournament. Teams were seeded by conference record with a tiebreaker system to seed teams with identical percentages. The top five teams received byes into the tournament quarterfinals. The remaining teams played in the first round. Tie-breaking procedures remained unchanged from the 2020 tournament.
| Seed | School | Conf | Tiebreaker(s) | |
|---|---|---|---|---|
| 1 | San Diego State | 14-3 | ||
| 2 | Utah State | 15–4 | ||
| 3 | Colorado State | 14–4 | ||
| 4 | Boise State | 14–6 | ||
| 5 | Nevada | 10–7 | ||
| 6 | Fresno State | 9–11 | ||
| 7 | UNLV | 8–10 | ||
| 8 | Wyoming | 7–9 | ||
| 9 | San Jose State | 3–13 | ||
| 10 | Air Force | 3–17 | ||
| 11 | New Mexico | 2–15 |
| Game | Time[1] | Matchup | Score | Television | Attendance | |
|---|---|---|---|---|---|---|
| First round – Wednesday, March 10 | ||||||
| 1 | 11:00 am | No. 8 Wyoming vs. No. 9 San Jose State | 111–80 | Stadium/MWN | ||
| 2 | 1:30 pm | No. 7 UNLV vs. No. 10 Air Force | 80–52 | |||
| 3 | 4:00 pm | No. 6 Fresno State vs. No. 11 New Mexico | 85–77 | |||
| Quarterfinals – Thursday, March 11 | ||||||
| 4 | 12:00 pm | No. 1 San Diego State vs. No. 8 Wyoming | 69–66 | CBSSN | ||
| 5 | 2:30 pm | No. 4 Boise State vs. No. 5 Nevada | 82–89 | |||
| 6 | 6:00 pm | No. 2 Utah State vs. No. 7 UNLV | 74–53 | |||
| 7 | 8:30 pm | No. 3 Colorado State vs. No. 6 Fresno State | 72–62 | |||
| Semifinals – Friday, March 12 | ||||||
| 8 | 6:30 pm | No. 1 San Diego State vs. No. 5 Nevada | 77–70 | CBSSN | ||
| 9 | 9:00 pm | No. 2 Utah State vs. No. 3 Colorado State | 62–50 | |||
| Championship – Saturday, March 13 | ||||||
| 10 | 3:00 pm | No. 1 San Diego State vs. No. 2 Utah State | 68–57 | CBS | ||
| Game times in PT. Rankings denote tournament seeding. | ||||||
* denotes overtime period