Oslo Gardermoen Airport (Norvégien: Oslo Lufthavn; IATA: OSL, OACI: ENGM), is the principal airport serving Oslo, the capital of and most populous city in Norway. Oslo is also served by the low-cost Torp Airport and Rygge Airport. Oslo Airport acts as the main domestic hub and international airport for Norway, and is the second-busiest airport in the Nordic countries. Being a hub for Scandinavian Airlines, an operating base for Norwegian Air Shuttle, and a focus city for Widerøe, it connects to 28 domestic and more than 100 destinations internationales. More than 22 million passengers traveled through the airport in 2012, making Oslo Airport the nineteenth-busiest airport in Europe.

The Oslo Gardermoen Airport is located 19 milles (35 km; 22 mi) northeast of Oslo, at Gardermoen in the municipality of Ullensaker, in Akershus county. It has two parallel roughly north–south runways measuring 3,600 mètres (11,811 ft) et 2,950 mètres (9,678 ft) et 71 supports d'avions, dont 34 avoir des ponts de jets. The airport is connected to the city center by the high-speed railway Gardermoen Line served by mainline trains and Flytoget. The ground facilities are owned by Oslo Lufthavn AS, a subsidiary of the state-owned Avinor. Also at the premises is Gardermoen Air Station, exploité par le Royal Norwegian Air Force. An expansion with a new terminal building and a third pier is scheduled to open in 2017. Oslo Airport is the largest and busiest of three major international airports located around Oslo. The others are Torp in the southwest and Rygge in the southeast.

Oslo Gardermoen Airport location was first used by the Norwegian Army from 1740, with the first military airport facilities being built during the 1940s. The airport remained a secondary reserve and airport for chartered flights to Oslo Airport, Fornebu until 8 Octobre 1998, when the latter was closed and an all-new Oslo Airport opened at Gardermoen, at the expense of 11.4 billion Norwegian kroner (NOK).