The Union Académique Internationale is an organization of many national academies from more than 60 countries and several international academies. There is three kind of membership in UAI.
Academies that have a national nature, and comparable national learned institutions, can be recognized and qualified for membership.
Academies and national learned institutions as described in Article 4 may alternatively be recognized as Associate Members.
The status of Affiliated Member may be accorded to scientific institutions and research institutes that have an international, a national or a regional character and that express the wish to cooperate in projects of the UAI or wich suggest projects to its direction or to its patronage.