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 campus serves most of the suburb of Leon Valley and large portions of northwest San Antonio.

[2] For the 2021-22 school year, Marshall was given a "C" by the Texas Education Agency, with a distinction for Academic Achievement in English Language Arts/Reading.

The school was once well known for its vocal music department, which had made sweepstakes in UIL over the past few decades.

The Marshall Rams compete in these sports: Baseball, Basketball, Cross Country, Football, Golf, Soccer, Softball, Swimming and Diving, Tennis, Track and Field, Volleyball, and Water Polo.

John Marshall defeated League City Clear Creek, 64-60 in overtime at Gregory Gym, University of Texas.

Though its attendance zones are much smaller than they were, Marshall still posts high academic scores and remains competitive in athletics, with the varsity football team winning the district title in 2006.

neighborhoods on Bandera Road were also rezoned back to Marshall due to realignment of other H.S.