Turkish Airlines is the national flag carrier airline of Turkey. As of August 2019, it operates scheduled services to 315 destinations in Europe, Asia, Africa, and the Americas, making it the largest mainline carrier in the world by number of passenger destinations. The airline serves more destinations non-stop from a single airport than any other airline in the world, and flies to 126 countries, more than any other airline. With an operational fleet of 24 cargo aircraft, the airline's cargo division serves 82 destinations.

The airline's corporate headquarters are at the Turkish Airlines General Management Building on the grounds of Istanbul Atatürk Airport in Yeşilköy, Bakırköy, Istanbul. Istanbul Airport in Arnavutköy is the airline's main base, and there are secondary hubs at Ankara Esenboğa Airport and İzmir Adnan Menderes Airport. Turkish Airlines has been a member of the Star Alliance network since 1 April 2008.

Turkish Airlines was established on 20 May 1933 as Turkish State Airlines as a department of the Ministry of National Defense. The airline's initial fleet consisted of two five-seat Curtiss Kingbirds, two four-seat Junkers F 13s and one ten-seat Tupolev ANT-9. In 1935, the airline was turned over to the Ministry of Public Works and was subsequently renamed General Directorate of State Airlines. Three years later, in 1938, it became part of the Ministry of Transportation.

As of 2019, Turkish Airlines flies to 315 destinations in 126 countries.