Sydney Kingsford Smith Airport (IATA: SYD, ICAO: YSSY) — colloquially Mascot Airport, Kingsford Smith Airport, or Sydney Airport — is an international airport in Sydney, New South Wales, Australia, located 8 km (5 mi) south of the Sydney central business district, in the suburb of Mascot. The airport is owned by Sydney Airport Holdings. It is the primary airport serving Sydney and is a primary hub for Qantas, as well as a secondary hub for Virgin Australia and Jetstar, and a focus city for Air New Zealand. Situated next to Botany Bay, the airport has three runways. Sydney Kingsford Int'l Airport covers 907 hectares (2,241 acres) of land.

Sydney Airport is one of the world's longest continuously operated commercial airports and is the busiest airport in Australia, handling 42.6 million passengers and 348,904 aircraft movements in 2016–17. It was the 38th busiest airport in the world in 2016. Currently, 46 domestic and 43 international destinations are served to Sydney directly.

In 2018, the airport was rated in the top five worldwide for airports handling 40–50 million passengers annually and was overall voted the 20th best airport in the world at the Skytrax World Airport Awards.