The International Council of the Aeronautical Sciences (ICAS) is a worldwide institution, established as an international forum for individual national aeronautical professional associations.
A second meeting was held in Paris, with Hugh Latimer Dryden of the National Advisory Committee for Aeronautics, and representatives from ONERA (Office National d'Etudes et de Recherches Aérospatiales), the Royal Aeronautical Society (RAeS), the WGL (now the Deutsche Gesellschaft für Luft- und Raumfahrt), the Association Française des Ingénieurs et Techniciens de l'Aéronautique (now the Association Aéronautique et Astronautique de France), and the Aeronautical Research Institute of Sweden.
The 2018 Congress was held by Associação Brasileira de Engenharia e Ciências Mecânicas (ABCM) in Brazil.
The secretariat of ICAS is at Deutsche Gesellschaft für Luft- und Raumfahrt (DLR) in Bonn.
It was first headquartered at the American Institute of Aeronautics and Astronautics (AIAA), the DLR from 1978, the RAeS in 1986, the Nederlandse Vereniging voor Luchtvaarttechniek from 1990, the AAAF (Association Aéronautique et Astronautique de France) from 1997, then Sweden from 2002, and Germany from January 2011.