UAI

UAI may refer to:


 * Union Académique Internationale, French for International Union of Academies
 * Universities Admission Index
 * Union astronomique internationale, the French name for the International Astronomical Union
 * Unione Astrofili Italiani
 * Universal Armament Interface
 * Universidad Adolfo Ibáñez, Spanish for Adolfo Ibáñez University
 * Universidad Abierta Interamericana, Spanish for Interamerican Open University
 * Unprotected Anal Intercourse
 * Uruguayan Antarctic Institute
 * Uncertainty avoidance index, the amount of tolerance of unpredictability