John Marshall High School (JMHS) is a free public secondary school in the San Antonio suburb of Leon Valley in northwest Bexar County named after Chief Justice John Marshall. The school serves students in grades 9-12, and is part of the Northside Independent School District, with admission based primarily on the locations of students' homes. The campus serves most of the suburb of Leon Valley and large portions of northwest San Antonio. Marshall was named a National Blue Ribbon School in 1992-93.