| United Airlines | United Airlines |
| United Center | United Center |
| United Nations Interim Administration Mission in Kosovo | United Nations Interim Administration Mission in Kosovo |
| United Nations Relief and Rehabilitation Administration | United Nations Relief and Rehabilitation Administration |
| United Nations Truce Supervision Organization | United Nations Truce Supervision Organization |
| United Paramount Network | UPN |
| United Parcel Service | United Parcel Service |
| United Soccer Leagues First Division | USL First Division |
| United Soccer Leagues Second Division | USL Second Division |
| United Soccer Leagues W-League | W-League |
| United States Air Force | United States Air Force |
| United States Army | United States Army |
| United States Army Air Corps | United States Army Air Corps |
| United States Army Air Force | United States Army Air Forces |
| United States Army Special Forces | United States Army Special Forces |
| United States Army Special Operations Command | United States Army Special Operations Command |
| United States Census Bureau | United States Census Bureau |
| United States Coast Guard | United States Coast Guard |
| United States Code | United States Code |
| United States Department of Defense | United States Department of Defense |
| United States Department of Energy | United States Department of Energy |
| United States Geological Survey | United States Geological Survey |
| United States Intelligence Community | United States Intelligence Community |
| United States Marine Corps | United States Marine Corps |
| United States Navy | United States Navy |
| United States Navy Fighter Weapons School | United States Navy Fighter Weapons School |
| United States Secret Service | United States Secret Service |
| United Technologies Corporation | United Technologies Corporation |
| United World Chart | United World Chart |
