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.

As a result, they received the conference's automatic bid to the NCAA tournament as the No.

They defeated Air Force and Boise State to reach the championship game of the Mountain West tournament where they lost to Utah State.

Although they were a virtual lock to receive an at-large bid to the NCAA tournament, on March 12 the NCAA Tournament was cancelled amid the COVID-19 pandemic.