Kansai International Airport (Japanese: 関西国際空港, romanized: Kansai Kokusai Kūkō), commonly known as Kankū (Japanese: 関空) (IATA: KIX, ICAO: RJBB), is the primary international airport in the Greater Osaka Area of Japan and the closest international airport to the cities of Osaka, Kyoto, and Kobe. It is located on an artificial island (Kankūjima (関空島)) in the middle of Osaka Bay off the Honshu shore, 38 km (24 mi) southwest of Ōsaka Station, located within three municipalities, including Izumisano (north), Sennan (south), and Tajiri (central), in Osaka Prefecture. The airport's first airport island covers approximately 510 hectares (1,260 acres) and the second covers approximately 545 hectares (1,347 acres), for a total of 1,055 hectares (2,607 acres).

Kansai opened on 4 September 1994 to relieve overcrowding at Osaka International Airport, also called Itami Airport, which is closer to Osaka. It consists of two terminals: Terminal 1 and Terminal 2. Terminal 1, designed by Italian architect Renzo Piano, is the longest airport terminal in the world with a length of 1.7 km (1+1⁄16 mi). The airport serves as an international hub for All Nippon Airways, Japan Airlines, and Nippon Cargo Airlines and as a hub for Peach, the first international low-cost carrier in Japan. It is also the North Pacific hub for the FedEx Express, which obtained its fifth-right under the 1998 U.S. and Japan air agreement and established the Hub in 2014.

In 2019, 31.9 million passengers used the airport, making it the third busiest in Japan. The freight volume was 802,162 tonnes total: 757,414 t international (18th in the world) and 44,748 t domestic.