The Epsom Downs Branch is a 3-mile-65-chain (6.1 km) railway line in Greater London and Surrey, England. It runs from Sutton to its southern terminus at Epsom Downs, with intermediate stations at Belmont and Banstead. With the exception of the northernmost 39 ch (780 m), the branch is single track. All stations are managed by Southern, which operates all passenger trains. Most services run between Epsom Downs and London Victoria via Selhurst.

Epsom Downs railway station is in the Borough of Reigate and Banstead in Surrey. The station, and all trains serving it, are operated by Southern. It is on the Epsom Downs line 18 miles 57 chains down the line from London Bridge, measured via West Croydon. In the past the station had nine platforms, but today only one remains.