St. John Bosco High School is a Catholic college preparatory school located in Bellflower, California, USA in the Los Angeles Metropolitan Area, conducted by the Salesians of St. John Bosco, San Francisco Province. SJBHS is named after Saint John Bosco and was originally founded as an elementary and intermediate boarding school by the Salesians of Don Bosco in 1940. The first high-school class graduated in 1956, and in 1979 the boarding school closed.
During the Second World War, portions of the school were used as a military barracks.
The school is a Catholic high school in the Roman Catholic Archdiocese of Los Angeles and has a student body of 758 students in grades 9-12.
St. John Bosco High School is one of the premier Catholic high schools in Southern California. The school's philosophy is to develop the "whole person" including "spiritually, morally, intellectually, socially, culturally, artistically, and physically".