UCR
- Centrist and Republican Union
- Radical Civic Union
- Torneo de Córdoba (rugby union)
- Under color removal
- Unified Cornish Revised
- Uniform Crime Reports
- University Center Rochester
- University College Roosevelt
- University of California, Riverside
- University of Costa Rica
- Unión Cordobesa de Rugby
- Upper Chattahoochee Riverkeeper
- Urea-creatinine ratio
- Usual, customary and reasonable