UAC
- Arab League
- National University of Benin
- Session Initiation Protocol
- Ulster Army Council
- Unaccompanied Alien Children
- Undeb Amaethwyr Cymru
- Unemployment Action Center
- Union Aerospace Corporation
- Union of Catholic Apostolate
- United Africa Company
- United Africa Company of Nigeria
- United Aircraft Corporation
- United Apostolic Church
- United Arab Command
- United Athletic Conference (football)
- Universidad Andina del Cusco
- Universities Admissions Centre
- Urban Appalachian Council
- Urban adult contemporary
- User Account Control
- Western Athletic Conference