International Civil Aviation Organization
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![](/Images/godic/202501/30/Flag_of_ICAO.svg3221.png")
![International Civil Aviation Organization member states](/Images/godic/202501/30/ICAO3221.png")
![ICAO logo.Top: ICAO acronym in English, French/Spanish, and Russian.Bottom: ICAO acronym in Chinese and Arabic](/Images/godic/202501/30/International_Civil_Aviation_Organization_logo.svg3221.png"){kind=logo}
The International Civil Aviation Organization (ICAO, pronounced /aɪˈkeɪ.oʊ/; French:Organisation de l'aviation civile internationale, OACI), is a specialized agency of the United Nations. It codifies the principles and techniques of international air navigation and fosters the planning and development of international air transport to ensure safe and orderly growth. Its headquarters are located in the Quartier International of Montreal, Canada.