Sihanouk International Airport (formerly Sihanoukville International Airport; Khmer: អាកាសយានដ្ឋានអន្តរជាតិខេត្តព្រះសីហនុ; French: Aéroport international de Sihanouk) (IATA: KOS, ICAO: VDSV), located 20 kilometres (12 mi) east of Sihanoukville City in Sihanoukville Province, is Cambodia's third largest international airport. It is named, like the province itself, after King Norodom Sihanouk. The airport is also known as Kang Keng Airport (Khmer: អាកាសយានដ្ឋានកងកេង). The IATA code KOS is derived from Sihanoukville's alternative name "Kampong Som".
Sihanoukville airport has been experiencing a robust traffic growth since its re-commissioning in 2007 thanks to the launch of international routes and the opening of several new lines serving this destination, which is increasingly popular with domestic and Asian tourists.