UIA
- Argentine Industrial Union
- International Islamic University Malaysia
- International Union of Architects
- Microsoft UI Automation
- UIA Mutual
- Uganda Investment Authority
- Uia
- Ukraine International Airlines
- Ukrainian Insurgent Army
- Unemployment Insurance Agency
- Uni Air
- Union Internationale des Avocats
- Union of International Associations
- United International Airlines
- United Iraqi Alliance
- United Israel Appeal
- Universidad Iberoamericana
- University of Agder
- University of Antwerp