The 2018–19 St. Bonaventure Bonnies men's basketball team represented St. Bonaventure University during the 2018–19 NCAA Division I men's basketball season.

The Bonnies, led by 12th-year head coach Mark Schmidt, played their home games at the Reilly Center in Olean, New York as members of the Atlantic 10 Conference.

They defeated George Mason and Rhode Island to advance to the championship game where they lost to Saint Louis.

They defeated Richmond in the quarterfinals of the A-10 tournament before losing in the semifinals to Davidson.

They received one of the last four at-large bids to the NCAA tournament where they defeated UCLA in the First Four before losing in the first round to Florida.