Kuala Lumpur International Airport (KLIA) (IATA: KUL, ICAO: WMKK) is the main international airport serving Kuala Lumpur, the capital of Malaysia. It is located in the Sepang District of Selangor, approximately 45 km (28 mi) south of downtown Kuala Lumpur and serves the city's greater conurbation.

KLIA is the largest and busiest airport in Malaysia and is recognised as a megahub. In 2023, it handled 47.2 million passengers, 980,040 tonnes of cargo and 819,026 aircraft movements, ranking as the 35th-busiest airport by total passenger traffic. As of 2024, KLIA has become the second most connected airport globally, following London Heathrow and preceding Tokyo Haneda in terms of international connectivity.