Kota Kinabalu International Airport (KKIA) (IATA: BKI, ICAO: WBKK) is an international airport in Kota Kinabalu, the state capital of Sabah, Malaysia. It is located approximately 8 km (5.0 mi) southwest of the city centre. In 2019, over 9 million passengers passed through the airport, making it the second busiest airport in Malaysia after Kuala Lumpur International Airport in terms of passenger movements & aircraft movements and the third busiest in terms of cargo handled.

Being the main gateway into East Malaysia, the airport serves as the main hub for MASwings, and the secondary hub for Firefly & Malaysia Airlines. The airport is also AirAsia Malaysia second largest hub in Malaysia after KLIA 2. Another Malaysia based low-cost carrier, MYAirline, also announce plans to utilize this airport as its secondary hub. However, the plan did not materialize as the airline faces a financial crisis in October 2023. Other general aviation companies such as Sabah Air Aviation, Sabah Flying Club, Sazma Aviation & Layang Layang Aerospace had set up their main base here.

Batik Air Malaysia (formerly known as Malindo Air), will re-activate Kota Kinabalu International Airport as its secondary hub soon. Currently, the airline only operates chartered flight from Kota Kinabalu and mainly focuses its operation in KLIA & Subang Airport.