Riddlesdown railway station is on the Oxted line serving Riddlesdown in the London Borough of Croydon, south London. It is in London fare zone 6, 13 miles 38 chains (13.48 miles, 21.69 km) from London Bridge, although off peak trains run to and from London Victoria. It is managed by Southern.

The Oxted line was opened in stages by different companies; Riddlesdown lies on the portion between South Croydon and Crowhurst Junction (to the south of Hurst Green), which was authorised in 1878 and opened on 10 March 1884 by the Croydon and Oxted Joint Railway. Riddlesdown was not one of the original stations on the line – it was opened by the Southern Railway on 5 June 1927.

There are two platforms, each of which is long enough for an eight-car train. When the station first opened, lighting was by gas. Electric lighting had been installed by April 1960.

Platform 1 is the platform for trains towards Croydon and London.

Platform 2 is the platform towards East Grinstead.

The station is unusual amongst suburban London stations in that there is no means of crossing between the platforms. The platforms are reached via separate footpaths from Lower Barn Road, either side of the bridge that takes the railway over the road.

On the London-bound platform 1, there is a staffed ticket office (open for only part of the day) and waiting room.

There are self-service ticket machines and Oyster scanners on both platforms.