| Year: | 2020–21 |
| Prev Year: | 2019–20 |
| Next Year: | 2021–22 |
| Team: | Cal State Fullerton Titans |
| Sex: | men |
| Sport: | basketball |
| Conference: | Big West Conference |
| Short Conf: | Big West |
| Record: | 5–6 |
| Conf Record: | 4–6 |
| Head Coach: | Dedrique Taylor |
| Hc Year: | 8th |
| Assoc Coach: | Gus Argenal |
| Ahc Year: | 2nd |
| Asst Coach1: | Brandon Dunson |
| Ac1 Year: | 2nd |
| Asst Coach2: | Anthony Santos |
| Ac2 Year: | 4th |
| Arena: | Titan Gym (Capacity: 4,000) |
The 2020–21 Cal State Fullerton Titans men's basketball team represented California State University, Fullerton in the 2020–21 NCAA Division I men's basketball season. The Titans, led by eighth-year head coach Dedrique Taylor, played their home games at Titan Gym as members of the Big West Conference.
See also: 2019–20 Cal State Fullerton Titans men's basketball team.
The Titans finished the 2019–20 season 11–20 overall, 6–10 in Big West Conference play to finish tied for 7th in the conference standings. A 7th seed in the Big West Conference tournament, the tournament was cancelled due to the COVID-19 pandemic, ending the Titans season.[1]
|-!colspan=9 style=| Non-conference regular season|-!colspan=9 style=| Big West regular season
Source: [2]