| Mode: | Basketball |
| Year: | 2020–21 |
| Prev Year: | 2019–20 |
| Next Year: | 2021–22 |
| Team: | Mount St. Mary's Mountaineers |
| Sport: | basketball |
| Conference: | Northeast Conference |
| Short Conf: | NEC |
| Record: | 12–11 |
| Conf Record: | 9–7 |
| Head Coach: | Dan Engelstad |
| Hc Year: | 3rd |
| Asst Coach1: | Will Holland |
| Asst Coach2: | Matt Miller |
| Asst Coach3: | Matt Graves |
| Stadium: | Knott Arena |
| Champion: | NEC tournament champions |
| Tourney: | NCAA tournament |
| Tourney Result: | First Four |
The 2020–21 Mount St. Mary's Mountaineers men's basketball team represented Mount St. Mary's University during the 2020–21 NCAA Division I men's basketball season. The Mountaineers were led by third-year head coach Dan Engelstad, and played their home games at Knott Arena in Emmitsburg, Maryland as members of the Northeast Conference. They finished the season 12-11, 9-7 in NEC Play to finish in 4th place. They defeated Wagner and Bryant to be champions of the NEC tournament. They received the conference’s automatic bid to the NCAA tournament where they lost in the First Four to Texas Southern.
The Mountaineers finished their previous season 11–21, 7–11 in NEC play to finish in a three-way tie for seventh place. They lost in the quarterfinals of the NEC tournament to Sacred Heart.
|-!colspan=12 style=| Non-Conference Regular season|-!colspan=12 style=| NEC tournament|-|-!colspan=12 style=| NCAA tournament|-Source[1]