The 2020–21 Idaho State Bengals men's basketball team represented Idaho State University in the 2020–21 NCAA Division I men's basketball season.

The Bengals, led by second-year head coach Ryan Looney, played their home games at Reed Gym in Pocatello, Idaho as members of the Big Sky Conference.

They lost in the quarterfinals of the Big Sky tournament to Montana State.

[1] The Bengals finished the 2019–20 season 8–22, 4–16 Big Sky play, to finish in a tie for tenth place.

[2] They were scheduled to take on the #3 seed Montana in the quarterfinals, but due to the ongoing coronavirus pandemic, all postseason tournaments were canceled, including the remainder of the Big Sky tournament.