Harrow High School is a co-educational academy in the London Borough of Harrow and a specialist Sports College. It was previously called Gayton High School and Harrow County School for Boys. The school has a sixth form for post-16 studies part of the Harrow Sixth Form Collegiate. There was an independent school with the same name on a nearby site until the late 1980s.

The London Borough of Harrow is a London borough in northwest London, England; it forms part of Outer London. It borders four other London boroughs – Barnet to the east of ancient Watling Street, Brent to the southeast, Ealing to the south and Hillingdon to the west – plus the Hertfordshire districts of Three Rivers and Hertsmere to the north. The local authority is Harrow London Borough Council. The London borough was formed in 1965, based on boundaries that had been established in 1934. The borough is made up of three towns: Harrow, Pinner and Stanmore, but also includes western parts of Edgware.