Clapham Junction railway station () is a major railway station and transport hub near St John’s Hill in the south-west of Battersea in the London Borough of Wandsworth. Although it is in Battersea, the area around the station is commonly identified as Clapham Junction.
Routes from London’s south and south-west termini, and , funnel through the station making it one of the busiest in Europe by number of trains using it, 100-180 per hour save for the five hours after midnight. The station is also the busiest UK station for interchanges between services.