The International Civil Aviation Organization is a specialized agency of the United Nations that coordinates the principles and techniques of international air navigation, and fosters the planning and development of international air transport to ensure safe and orderly growth. The ICAO headquarters are located in the Quartier international de Montréal of Montreal, Quebec, Canada.

The Quartier international de Montréal (QIM) or Montreal's International District is a district of the Ville-Marie borough in the city's downtown core of Montreal, Quebec, Canada. It is roughly bordered by René-Levesque Boulevard to the north, Notre-Dame Street to the south, De Bleury/Saint-Pierre Street to the east and Robert-Bourassa Boulevard to the west. The Palais des congrès building lying just east of the district is also usually comprised in it. Constructed dispersedly between 1965 and 1985 in place of older colonial housing blocks, the district underwent major urban renewal as a central business district in 2000–2003.