The 2020–21 Idaho Vandals men's basketball team represented the University of Idaho in the Big Sky Conference during the 2020–21 NCAA Division I men's basketball season. Led by second-year head coach Zac Claus, the Vandals played their home games on campus at Memorial Gymnasium in Moscow, Idaho. Due to the COVID-19 pandemic, home games were switched to venerable Memorial Gymnasium (1928). The 2020 football season in the Big Sky was delayed until early 2021; football practice started in late January in the Kibbie Dome, and the first of six games was held in late February.