The 2020–21 San Diego State Aztecs men's basketball team represented San Diego State University during the 2020–21 NCAA Division I men's basketball season. The Aztecs, led by fourth-year head coach Brian Dutcher, played their home games at Viejas Arena as members in the Mountain West Conference. The Aztecs finished the season 23–5, 14–3 in Mountain West play to win the regular season championship. In the Mountain West tournament, they defeated Wyoming, Nevada, and Utah State to win the tournament championship. As a result, they received the conference's automatic bid to the NCAA tournament as the No. 6 seed in the Midwest region. There they lost in the first round to Syracuse.