Gatwick Airport railway station is on the Brighton Main Line in West Sussex, England. It serves Gatwick Airport, 26 miles 47 chains (42.8 km) down the line from London Bridge via Redhill. The platforms are about 70 metres (230 ft) to the east of the airport's South Terminal, with the ticket office above the platforms and station entrances and exits directly connected to the terminal. The station is also connected to the airport's North Terminal by the Airport Shuttle people-mover. Gatwick Airport was the busiest station in South East England from 2017 to 2018. There have been two stations at Gatwick, sited about 0.85 miles (1.37 km) from each other. It is the busiest station in both West Sussex and South East England, and the sixth busiest station in the UK outside of London.

The Brighton Main Line is a railway line in southern England linking London to Brighton. It starts at two termini in the capital, London Victoria and London Bridge, and the branches from each meet at East Croydon, from where the route continues southwards via Gatwick Airport to the coast. The line serves the suburbs of South London, as well as the towns of Redhill, Horley, Crawley, Haywards Heath and Burgess Hill.