The 2020–21 Niagara Purple Eagles men's basketball team represented Niagara University in the 2020–21 NCAA Division I men's basketball season.

The Purple Eagles, led by second-year head coach Greg Paulus, played their home games at the Gallagher Center in Lewiston, New York as members of the Metro Atlantic Athletic Conference.

5 seed in the MAAC tournament, they defeated No.

The Purple Eagles finished the 2019–20 season 12–20 overall, 9–11 in MAAC play to finish in a tie for sixth place.

[3] Before they could face #3 seeded Rider in the MAAC tournament quarterfinals, all postseason tournaments were cancelled amid the COVID-19 pandemic.