The 2018–19 Saint Mary's Gaels men's basketball team represents Saint Mary's College of California during the 2018–19 NCAA Division I men's basketball season. The team is led by head coach Randy Bennett in his 18th season at Saint Mary's. The Gaels play their home games at the McKeon Pavilion in Moraga, California as members of the West Coast Conference. They finished the season 22-12, to finish in 2nd place. In the WCC Tournament, they defeated San Diego in the semifinals and beat Gonzaga in the championship to win the WCC Tournament. Therefore, they received a automatic bid to the NCAA Tournament where they lost in the first round to Villanova.