Redhill is a town in the borough of Reigate and Banstead within the county of Surrey, England. The town, which adjoins the town of Reigate to the west, is due south of Croydon in Greater London, and is part of the London commuter belt. The town is also the post town, entertainment and commercial area of three adjoining communities : Merstham, Earlswood and Whitebushes, as well as of two small rural villages to the east in the Tandridge District, Bletchingley and Nutfield.

Reigate and Banstead is a local government district with borough status in Surrey, England. Its council is based in Reigate and the borough also includes the towns of Banstead, Horley and Redhill. Parts of the borough are within the Surrey Hills, a designated Area of Outstanding Natural Beauty. Northern parts of the borough, including Banstead, lie inside the M25 motorway which encircles London.