Gimpo International Airport (IATA: GMP, ICAO: RKSS) (sometimes referred to as Seoul–Gimpo International Airport), formerly rendered in English as Kimpo International Airport, is located in the far western end of Seoul, some 15 km (9 mi) west of the Central District of Seoul. Gimpo was the main international airport for Seoul and South Korea before being replaced by Incheon International Airport in 2001. It now functions as Seoul's secondary airport. In 2015, over 23 million passengers used the airport, making it the third-largest airport in Korea, as it has been surpassed by Jeju International Airport.

The airport is located south of the Han River in western Seoul. The name "Gimpo" comes from the nearby city of Gimpo, of which the airport used to be a part.

On 29 November 2003, scheduled services between Gimpo and Haneda Airport in Tokyo resumed with services also operating at Incheon Airport. Services to Shanghai Hongqiao International Airport resumed on 28 October 2007. Services to Kansai International Airport in Osaka, Japan, started on 26 October 2008 with services also operating at Incheon Airport. Services to Beijing Capital International Airport started on 1 July 2011 with services also operating at Incheon Airport.