| University Transfer Center | Academic & Science |
| University of Tennessee Chattanooga | Academic & Science |
| University Training Corps | Academic & Science |
| University Towne Center | Academic & Science |
| University Towne Centre | Academic & Science |
| University Town Center | Academic & Science |
| University of Tennessee at Chattanooga | Academic & Science |
| United Theological College | Academic & Science |
| United Theological Seminary | Academic & Science |
| University Teaching Center | Academic & Science |
| Utrecht | Airport Code |
| Uniroyal Technology Corporation | Business |
| Under The Counter | Business |
| Utilities Telecom Council | Business |
| U. S. Trust Corporation | Business |
| Under The Crown | Business |
| Unit Technical Cost | Business |
| United Technologies Corp | Business |
| Union Treiste Catalan | Community |
| Unicode Technical Committee | Community |
| Universal Time Code | Computer and Networking |
| Unified Translation Cache | Computing |
| Utah Technology Commission | Computing |
| Universal Time Coordinate | Computing |
| Universal Time Conversion | Computing |
| User Tracking Cookie | Computing |
| United Technologies Center | Computing |
| University Technical College | Educational Institute |
| Time Conversion | General |
| Universal Training Curriculum | General |
| Urban Tree Canopy | General |
| Unit Test Cases | General |
| Unmanned Traffic Controller | General |
| Universal Trade Capture | General |
| Unavoidable Transgender Communism | General |
| Urban Traffic Control | General |
| Ultimate Torque Converter | General |
| Uniform Traffic Citation | General |
| Uniform Traffic Code | General |
| Ushuaia Tuning Club | General |
| Utah Toyota Club | General |
| Union Taxi Cooperative | General |
| Used Truck Center | General |
| Universal Time Coordinated | General |
| Ultrasound, Temperature & Chemicals (jewellery care instructions) | General |
| Undifferentiated Thyroid Carcinoma | General |
| Ultrasonic tissue characterization | General |
| Universal Time Coordinates | General |
| Urban Transportation Center | Governmental |
| University Transportation Centers | Governmental |
| Utilities and Transportation Commission | Governmental |
| University Transportation Center | Governmental |
| Utilitiesman Chief Petty Officer | Governmental |
| Utilities Technology Council | Governmental |
| Coordinated Universal Time | Information Technology |
| Up The Creek | Messaging |
| United Technologies | Messaging |
| Unit Type Code | Military and Defence |
| Unit Training Center | Military and Defence |
| Unit Training Coordinator | Military and Defence |
| Unable To Change | Softwares |
| Unit Test Case | Space Science |
| United Technologies Corporation | Space Science |
| United Technology Center | Space Science |
| Universal Test Console | Space Science |
| Unreal Tournament Classes | Sports |
| Up The Clarets | Sports |
| Utah Technology Council | Technology |
| Coordinated Universal Time (temps Universel Coordonn | Time |
| Uttarakhand Transport Corporation | Uttarakhand Government |
