The 2018–19 Saint Mary's Gaels men's basketball team represented Saint Mary's College of California during the 2018–19 NCAA Division I men's basketball season.

The team was led by head coach Randy Bennett in his 18th season at Saint Mary's.

The Gaels played their home games at the McKeon Pavilion in Moraga, California as members of the West Coast Conference.

Therefore, they received an automatic bid to the NCAA Tournament and they lost in the first round to Villanova.

2 seed in the WCC tournament, they defeated Pepperdine in the quarterfinals before losing to BYU in the semifinals.