UA
- .ua
- Future Force unit of action
- German Type UA submarine
- German submarine UA (1939)
- Heat transfer coefficient
- OPC Unified Architecture
- The Umbrella Academy
- U of A (disambiguation)
- UP Aerospace
- Ua (singer)
- Ukraine
- Unauthorized absence
- Under Armour
- Unearthed Arcana
- Union Association
- Unit of account
- Unitary authority
- United Abominations
- United Airlines
- United Artists
- United Association
- Universal Acceptance
- Universal Audio (company)
- University Alliance
- University of Abra
- University of Akron
- University of Alabama
- University of Alaska system
- University of Alicante
- University of Antwerp
- University of Arizona
- University of Arkansas
- Unknown Armies
- Unstable angina
- Upper Arlington, Ohio
- Urban Assault
- Urban area
- Uric acid
- Urinalysis
- Ursuline (disambiguation)
- User agent
- User assistance