Bishop Montgomery High School (commonly referred to as "BMHS" or simply "Bishop" by students) is a Catholic high school serving twenty-five parishes in the Roman Catholic Archdiocese of Los Angeles. BMHS was founded in 1957, and staffed by the Sisters of St. Joseph of Carondelet, Conventual Franciscans, and lay faculty. The 24-acre campus is located in Torrance, California, in southwest Los Angeles County, one mile from the Pacific Ocean and the Del Amo Mall. The coeducational student body is comprised of approximately 1,200 students in grades 9 through 12, making BMHS the sixth largest private high school in Los Angeles County. The faculty is headed by Principal Rosemary Libbon.

The school is named for the first American-born Bishop of Monterey-Los Angeles, the Most Reverend George Thomas Montgomery. As the ordinary of the diocese from 1896 to 1902, Bishop Montgomery demanded that government recognize the right of parents to send their children to schools of their choice.

BMHS is accredited by the Western Association of Schools and Colleges (WASC) and offers a comprehensive college preparatory curriculum combined with Christian values. Advanced Placement courses are offered in all major subjects, and 98 percent of graduates pursue higher education.