In keeping with its commitment to developing well-rounded students, Brentwood offers a strong athletic program. During the course of each school year, the school fields 48 interscholastic teams in the Middle and Upper Schools, as well as 6 in the Lower School, many overseen by faculty coaches. Boys compete in football, cross-country, basketball, soccer, tennis, golf, baseball, volleyball, and track.
Girls compete in volleyball, tennis, cross-country, basketball, soccer, softball, track, and golf.
Three years of physical education are required in the Upper School, where program offerings include cardio-fitness and weight training.