The Warriors are primarily members of the Pacific West Conference (PacWest), where 12 of its 15 athletics programs compete.
The men's and women's indoor track and field programs are independents while the women's swimming and diving program is a member of the Pacific Collegiate Swim and Dive Conference.
On July 14, 2022, Westmont College has been notified by the National Collegiate Athletic Association (NCAA) that it was accepted into the multi-year membership process for Division II, while subsequently joining the (PacWest).
The men's soccer team won the NAIA national championship in 1972.
They also compete in rugby football, ultimate frisbee, men's volleyball and cheerleading.