The Union Académique Internationale (UAI)—in English, International Union of Academies—is a federation of many national academies and international academies from more than 60 countries all over the world which works in the field of Humanities and Social Sciences.

The Union wants to create an international collaboration between its Member Academies, offering to them a chance to meet and work together on projects of medium and long term and enabling them to participating to the great national and international movement of scientific research. Its purpose is to encourage cooperation in the advancement of studies through collaborative research and joint publications in those branches of humanities and social sciences promoted by the Academies and Institutions represented in the UAI: philology, archaeology, history, moral sciences and political sciences. The UAI works to promote the advancement of knowledge and scientific exchanges and to support initiatives of all its academies.

French and English are the official languages of the union.