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.

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] Roster Last update: December 7, 2020 Source: [2]