Aegean Airlines S.A. (Greek: Αεροπορία Αιγαίου Ανώνυμη Αεροπορική Εταιρεία,Aeroporía Aigíou Anónime Etairía pronounced [aeropoˈria eˈʝeu]; : ) is the largest Greek airline by total number of passengers carried, by number of destinations served and by fleet size. A Star Alliance member since June 2010, it operates scheduled and charter services from Athens and Thessaloniki to other major Greek destinations as well as to a number of European and Middle Eastern destinations. Its main hubs are Athens International Airport in Athens, Thessaloniki International Airport in Thessaloniki and Larnaca International Airport in Cyprus. It also uses other Greek airports as bases, some of which are seasonal. It has its head office in Kifisia, a suburb of Athens. Although the airline is the largest airline in Greece, it is not a flag carrier.

On 21 October 2012, Aegean Airlines announced that it had struck a deal to acquire Olympic Air, and the buyout was approved by the European Commission a year later, on 9 October 2013. Both carriers continue to operate under separate brands. In addition, Aegean Airlines participated in the final stages of the tender for the privatization of Cyprus Airways, the national carrier of Cyprus. Following the bankruptcy of Cyprus Airways, Aegean Airways established a hub at Larnaca Airport, thus initiating scheduled flights to and from the island to various destinations and filling the service gap created by the services termination of Cyprus Airways.

Aegean Airlines was founded as Aegean Aviation in 1987. It was originally a VIP/business air operation specialising in executive and air ambulance services. On 17 February 1992, it became the first airline to be issued with a Greek independent air operator's licence. After it was acquired by Vasilakis Group in 1994, Aegean Aviation commenced VIP flights from Athens all over the world with wholly owned Learjet aircraft. The Aegean Airlines name was adopted with the start of scheduled passenger services at the end of May 1999.

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