Mount Vernon High School is a public high school in the Fairfax County Public Schools system located in Mount Vernon, Virginia.

The Fairfax County Public Schools system (FCPS) is a school division in the U.S. commonwealth of Virginia. It is a branch of the Fairfax County government which administers public schools in Fairfax County and the City of Fairfax. FCPS's headquarters is located in the Gatehouse Administration Center in Merrifield, an unincorporated section of the county near the city of Falls Church; the headquarters has a Falls Church address but is not within the city limits.