Bishop Amat Memorial High School is a co-ed Catholic high school serving the San Gabriel Valley in the Roman Catholic Archdiocese of Los Angeles, and was founded in 1957. The campus is located in La Puente, California, approximately 20 miles (32 km) east of downtown Los Angeles in Los Angeles County. The coeducational student body comprises approximately 1,520 students in grades 9 through 12, making Bishop Amat the largest private high school in Los Angeles County. It is the only Catholic high school in Los Angeles County that offers the International Baccalaureate Diploma Program (IB).