Clapham High Street railway station is on the South London line in Clapham, within the London Borough of Lambeth, Greater London. It is 6 miles 21 chains (10.1 km) measured from London Bridge. It is served by London Overground services between Clapham Junction and Dalston Junction, with a limited service to Battersea Park. Southeastern services from Lewisham pass through the station, however proposals to call at the station have been limited by the age of Southeastern’s rolling stock.

The South London line is a railway line in inner south London, England. The initial steam passenger service on the route was established by the London, Brighton and South Coast Railway (LBSCR) on 1 May 1867 when the central London terminal stations of Victoria and London Bridge were connected to the inner south London suburbs of Battersea, Clapham, Brixton, Camberwell and Peckham. A pioneer of overhead electric traction, most of the line was built on high level viaducts and was marketed as the South London Elevated Electric Railway in the early part of the 20th century. The electric service was popular, with four trains per hour and 12 million passengers in 1920. Between Wandsworth Road and Peckham Rye the route ran parallel to another set of tracks. Prior to 1923, both lines from Wandsworth Road to East Brixton were owned by the London, Chatham and Dover Railway (LCDR) and the lines from East Brixton to Peckham Rye were owned by the LBSCR. The southern Atlantic lines were operated by the LBSCR and the northern Chatham lines were operated by the LCDR.