Incheon International Airport (IATA: ICN, ICAO: RKSI) is the main international airport serving Seoul, the capital of South Korea. It is also one of the largest and busiest airports in the world.

This airport opened for business on 29 March 2001 to replace the older Gimpo International Airport, which now serves mostly domestic destinations and shuttle flights to several East Asian metropolitan areas, including Beijing–Capital, Kaohsiung, Osaka–Kansai, Shanghai–Hongqiao, Taipei–Songshan and Tokyo–Haneda.

Incheon International Airport is located west of Incheon's city center, on an artificially created piece of land between Yeongjong and Yongyu Islands. A shallow sea originally separated the two islands. That area between the two islands was reclaimed for the construction project, effectively connecting the once-separate Yeongjong and Yongyu islands. The reclaimed area and the two islands are all part of Jung-gu, an administrative district of Incheon. The airport has 111 boarding gates altogether, with 44 in Terminal 1, 30 in Concourse A (connected to Terminal 1), and 37 in Terminal 2.

This airport was constructed to share the demand for air transport in the 21st century and to serve as a hub airport in Northeast Asia.