Sydney (Kingsford Smith) International Airport, or Sydney Airport (IATA: SYD, ICAO: YSSY), is located in the Sydney suburb of Mascot. It is the major airport serving Sydney, and is a major hub for Qantas. Sydney Airport is the world's oldest continually operated commercial airport, and the busiest commercial airport in Australia, handling in excess of 30 million passengers per year (2006). It is currently the 33rd busiest airport in the world.

Situated next to Botany Bay, the airport is accessible by road and via the Airport line underground rail link. In terms of land area, it is the smallest capital city airport in Australia. Kingsford Smith has three runways, colloquially known as the "East-West" and two "North-South" runways.