Montréal–Mirabel International Airport (or Montréal International (Mirabel) Airport) (IATA: YMX, ICAO: CYMX), originally called Montréal International Airport and widely known simply as Mirabel, is a cargo airport located in Mirabel, Quebec, Canada, 21 nautical miles (39 km; 24 mi) northwest of Montreal and opened October 4, 1975.

On September 11, 2001, Mirabel International Airport participated in Operation Yellow Ribbon and took in 10 diverted flights that had been bound for the closed airspace over the United States. Mirabel was designed to be eventually expanded to six runways and six terminal buildings, with a separate STOLport also planned.

Bombardier Aerospace houses its CRJ and new CSeries assembly lines on the property of Mirabel Airport. Bell Helicopter manufactures all its commercial helicopters at a plant located on the airport. Nolisair (Nationair), during its existence, had its head office in the Nationair Building on the Montreal Mirabel Airport property.

Montreal Mirabel Airport was the largest airport in the world in terms of surface area ever envisioned, with a planned area of 39,660 hectares (396.6 km2). The King Fahd International Airport in Saudi Arabia, which was completed in 1999, surpassed its surface area.