Dublin Airport (IATA: DUB, ICAO: EIDW), or Aerfort Bhaile Átha Cliath in Irish, is located in Collinstown, in the Fingal part of County Dublin, it is by far the busiest airport in Ireland and is ranked as 14th busiest in Europe by passenger numbers for 2006, when more than 21.1 million passengers travelled through the airport.

Dublin Airport is the headquarters of Ireland's flag carrier Aer Lingus, and Europe's largest no-frills airline Ryanair. Ireland's third airline, CityJet, is based in the nearby town of Swords.

In 2006, the airport was the 18th busiest international airport in the world, up from 20th in 2005. Two major milestones occurred at Dublin Airport in 2006. Passenger numbers in June passed the two million mark for the first time in a single month (this was repeated in July, August, and September). On 8 December the airport welcomed its 20 millionth passenger of the year. Passenger traffic at Dublin Airport is predominantly international; only 810,000 of its 21.1 million passengers in 2006 were domestic. 23.2 million passengers were expected to use the airport during 2007.