The St-Just Cyclone, also called the St-Just Cyclone 180, is a Canadian homebuilt aircraft that was designed and produced by St-Just Aviation of Mirabel, Quebec. The company has since moved to Boucherville, Quebec. While it was available the aircraft was supplied as a kit and in the form of plans for amateur construction.The Cyclone was later developed into the higher gross weight (3,500 lb (1,600 kg)) St-Just Super-Cyclone, which superseded it in production.