The 2019–20 St. Bonaventure Bonnies men's basketball team represented St. Bonaventure University during the 2019–20 NCAA Division I men's basketball season.

The Bonnies, led by 13th-year head coach Mark Schmidt, played their home games at the Reilly Center in Olean, New York as members of the Atlantic 10 Conference.

Their season ended when the A-10 tournament and all other postseason tournaments were canceled due to the ongoing coronavirus pandemic.

In the A-10 tournament, they defeated George Mason and Rhode Island before losing in the championship game to Saint Louis.

The Bonnies did not participate in a postseason tournament.