| Year: | 2020–21 |
| Next Year: | 2021–22 |
| Team: | UC San Diego Tritons |
| Sport: | basketball |
| Sex: | men |
| Conference: | Big West Conference |
| Short Conf: | Big West |
| Record: | 7–10 |
| Conf Record: | 4–8 |
| Head Coach: | Eric Olen |
| Hc Year: | 8th |
| Assoc Coach: | Clint Allard |
| Ahc Year: | 7th |
| Asst Coach1: | Nick Booker |
| Ac1 Year: | 1st |
| Asst Coach2: | Brendan Clowry |
| Ac2 Year: | 7th |
| Arena: | RIMAC Arena |
The 2020–21 UC San Diego Tritons men's basketball team represented the University of California, San Diego in the 2020–21 NCAA Division I men's basketball season. The Tritons, led by eighth-year head coach Eric Olen, were in their first season at the NCAA Division I level and played their games at RIMAC Arena as a member of the Big West Conference. Because of the transition period, games in the Big West did not count towards the standings or conference record, and the Tritons were ineligible for the postseason, including the Big West tournament.
The Tritons finished the 2019–20 season with a 30–1 record, 21–1 in California Collegiate Athletic Association (CCAA) play, to finish first in the CCAA. They later won the CCAA conference tournament with a 76–62 win over Cal Poly Pomona.
|-!colspan=9 style=| Regular season
Source:[1]