The 2019–20 San Diego State Aztecs men's basketball team represented San Diego State University during the 2019–20 NCAA Division I men's basketball season.

The Aztecs, led by third-year head coach Brian Dutcher, played their home games at Viejas Arena as members in the Mountain West Conference.

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 and a high seed in the NCAA tournament, on March 12 the NCAA Tournament was cancelled amid the COVID-19 pandemic.

They defeated UNLV[2] and Nevada[3] to advance to the championship game of the Mountain West tournament where they lost to Utah State.