Saint John Airport (French: Aéroport de Saint-Jean) (IATA: YSJ, ICAO: CYSJ) is a Canadian airport in Saint John, New Brunswick. Located about 8 nautical miles (15 km; 9.2 mi) east northeast of Uptown Saint John, in an area formerly known as Clover Valley, the airport serves the city of Saint John, the Greater Saint John metropolitan area, and the southern region of New Brunswick.

The airport, owned by Transport Canada, has been operated by the private non-profit corporation Saint John Airport Inc. since 1999. It is part of the National Airports System. In 2023, the terminal handled 175,000 passengers.