Don Mueang International Airport (IATA: DMK, ICAO: VTBD) — known as Bangkok International Airport before 2006 — is one of two international airports serving Bangkok, the capital of Thailand, the other being Suvarnabhumi Airport (BKK).

The airport is considered one of the world's oldest international airports and one of Asia's oldest operating airports. It officially opened as a Royal Thai Air Force (RTAF) base on 27 March 1914, although it had been in use earlier. Commercial flights began in 1924, making it one of the world's oldest commercial airports. The airport consists of Terminal 1 for international flights and Terminal 2 for domestic flights, which are connected by a unique glass exterior elevated walkway. The airport also featured an exterior walkway connected to the Amari hotel. The first commercial flight was an arrival by KLM Royal Dutch Airlines.

In September 2006, Don Mueang Airport was closed and to be replaced by the new Suvarnabhumi Airport, before reopening on 24 March 2007 after renovations. Since the reopening, Don Mueang has become a regional commuter flight hub and the de facto low-cost airline hub. In 2015, it became the world's largest low-cost carrier airport.