Leigh-on-Sea railway station is on the London, Tilbury and Southend line, serving the town of Leigh-on-Sea, Essex. It is 32 miles 43 chains (52.4 km) down the main line from London Fenchurch Street via Basildon and it is situated between Benfleet to the west and Chalkwell to the east. Its three-letter station code is LES.

The London, Tilbury and Southend line, also known as Essex Thameside, is a commuter railway line on the British railway system. It connects Fenchurch Street station, in central London, with destinations in east London and Essex, including Barking, Upminster, Basildon, Grays, Tilbury, Southend and Shoeburyness.