Gatwick Airport (IATA: LGW, ICAO: EGKK) is London's second largest airport and the second busiest airport in the United Kingdom after Heathrow. It is also the world's busiest single runway airport, and the world's 22nd busiest airport in terms of passengers per year (7th in terms of international passengers). It is located in Crawley, West Sussex (originally Charlwood, Surrey) 2.7 nm (5 km or 3 miles) north of the town centre, 24.7 nm (46 km or 28 miles) south of London and 21.6 nm (40 km or 25 miles) north of Brighton.

Gatwick Airport has two terminals, called North and South. The terminals are connected by a transit system consisting of three-car automatic driverless vehicles that run along a 1.2km long elevated two-way track. The transit is free to use with a travel time of one minute fifty-six seconds. It runs every three minutes in peak travel periods (when two vehicles are used), and every six minutes at all other times (when one vehicle shuttles back and forth).

The name "Gatwick" dates back to 1241, and was the name of a manor on the site of today's airport until the 19th century. It is derived from the Anglo-Saxon words gat, 'goat', and wic, 'dairy farm', i.e. 'goat farm'.