Thai Airways International Public Company Limited, trading as THAI (: THAI, Thai: บริษัท การบินไทย จำกัด (มหาชน)) is the flag carrier airline of Thailand. Formed in 1988, the airline has its corporate headquarters in Vibhavadi Rangsit Road, Chatuchak District, Bangkok, and primarily operates out of Suvarnabhumi Airport. THAI is a founding member of the Star Alliance. The airline is the largest shareholder of the low-cost carrier Nok Air with a 39 percent stake, and it launched a regional carrier under the name Thai Smile in the middle of 2012 using new Airbus A320 aircraft.

From its hub at Suvarnabhumi Airport, THAI flies to 80 destinations in 37 countries, using a fleet of more than 90 aircraft. The airline was once the operator of two of the world's longest non-stop routes between Bangkok and Los Angeles and New York City, but due to high fuel prices, the withdrawal of aircraft, luggage weight limits and rising airfares, the airline abandoned all non-stop US services in 2012 indefinitely. As of 2013, services between Bangkok and Los Angeles were served via Incheon International Airport near Seoul, however, it ended its service to the US on 25 October 2015. THAI's route network is dominated by flights to Europe, East Asia, and South/Southwest Asia, though the airline serves five cities in Oceania. THAI was the first Asia-Pacific airline to serve London Heathrow Airport. Among Asia-Pacific carriers, THAI has one of the largest passenger operations in Europe.

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