Belfast International Airport (IATA: BFS, ICAO: EGAA) is an international airport 11.5 NM (21.3 km; 13.2 mi) northwest of Belfast in Northern Ireland, and is the main airport for the city of Belfast. Until 1983, it was known as Aldergrove Airport, after the nearby village of Aldergrove, County Antrim. In 2023, over 5.9 million passengers travelled through the airport, a 23.6% increase compared with 2022. The majority of flights from Belfast International are operated by easyJet, Northern Ireland's biggest airline. It features flights to some European metropolitan and several leisure destinations.

Belfast International has a CAA Public Use Aerodrome Licence that allows flights for the public transport of passengers or for flying instruction. The airfield was previously shared with the Royal Air Force base RAF Aldergrove, which closed in 2008. The base is now known as Joint Helicopter Command Flying Station, Aldergrove, and both runways are now owned by the airport.