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.

Kuala Lumpur International Airport is the largest and busiest airport in Malaysia and is recognised as a mega hub. 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, Kuala Lumpur International Airport has become the second most connected airport globally, according to the OAG Megahub Index, following London-Heathrow. Other airports in the top five included Tokyo–Haneda, Amsterdam and Seoul–Incheon.