The 2017–18 Saint Mary's Gaels women's basketball team represented Saint Mary's College of California in the 2017–18 NCAA Division I women's basketball season.

The Gales, led by twelfth year head coach Paul Thomas, played their home games at the McKeon Pavilion and were members of the West Coast Conference.

They received an automatic bid to the Women's National Invitation Tournament, where they lost to New Mexico in the first round.

They advanced to the championship game of the WCC women's tournament where they lost to Gonzaga.

They received an at-large bid to the WNIT where they lost to Colorado State in the first round.