Sihanouk International Airport (formerly Sihanoukville International Airport) (IATA: KOS, ICAO: VDSV)(Khmer: អាកាសយានដ្ឋានអន្តរជាតិក្រុងព្រះសីហនុ French: Aéroport International de Sihanouk), located 20 kilometres (12 mi) east of Sihanoukville in Preah Sihanouk Province, is Cambodia's third largest international airport.

The airport is also known as Kaong Kang Airport (Kaong Kang, កោងកាង = mangrove). The IATA code KOS is derived from Sihanoukville's alternative name Kompong Som.