The 2020–21 Stony Brook Seawolves men's basketball team represented Stony Brook University in the 2020–21 NCAA Division I men's basketball season. They played their home games at the Island Federal Credit Union Arena in Stony Brook, New York and were led by second-year head coach Geno Ford. They were members of the America East Conference. They finished the season 9-14, 7-9 in America East Play to finish in 7th place. In the America East tournament, they lost in the first round to UMass Lowell.