London Stansted Airport (IATA: STN, ICAO: EGSS) is a large passenger airport with a single runway and hub for a number of major European low-cost airlines. It is located in the Uttlesford District of the English county of Essex about 30 miles (48 km) north-east of London. It is about 2 miles (3 km) outside Bishop's Stortford and 6 miles (10 km) outside Harlow. It is the third largest airport serving the London area after Heathrow and Gatwick; and is one of London's five international airports along with Luton and London City Airports.

Several budget airlines such as Ryanair and EasyJet maintain bases at Stansted, and Volga-Dnepr often station a large Antonov AN-124 freighter to the northwest of the main runway ready to carry outsize cargoes. FedEx is a dominant operator of trans-Atlantic freighter services.

Stansted Airport is named after the small village Stansted Mountfitchet. The nearest larger town to the airport is Bishop's Stortford.

In the last ten years Stansted has seen a rapid expansion of passenger numbers: Having 12 million passengers in 2000, the number of passengers using Stansted in 2004 was 20.9 million which rose by 5.3% to 21.9 million in 2005.