Singapore Changi Airport ( CHAHNG-ee) (IATA: SIN, ICAO: WSSS) is a major international airport that serves Singapore, and is one of the largest transportation hubs in Asia. More than 100 airlines operate from the airport, with flights to destinations in Asia, Oceania, Africa, Europe, the Middle East, and North America.

The airport is located within its namesake, the district of Changi, at the eastern end of Singapore, approximately 24 kilometres (15 miles) east from Singapore's Downtown Core on a 25-square-kilometre (9.7 sq mi) site. It is the home base of BOC Aviation and Jetstar Asia, as well as the country's flag carrier of Singapore Airlines, its cargo division Singapore Airlines Cargo and its low-cost subsidiary Scoot. SATS is also headquartered at the airport.

With Singapore's strategic location being a favourable destination for high demand layovers, the airport also serves as a focus city for Qantas, as well as the flagship cargo hub for FedEx Express in Asia. In 2019, Changi Airport served 68.3 million passengers, making it the 18th busiest airport in the world. The airport is operated by Changi Airport Group, a wholly-owned subsidiary under the purview of the Ministry of Finance of the Government of Singapore. It is served by three runways, all 4 kilometres (2.5 mi) long, and consists of four terminal buildings. Three of the terminal buildings are connected to an entertainment and retail complex known as Jewel Changi Airport.