| Meaning | Category |
| The Underground Crew | Community->Music |
| Ugly Green Chair | Business->Products |
| Ukiah Gun Club | Community->Sports |
| Ultimate Gamers Community | Community->Sports |
| UnderGround Communications | Internet->Chat Business->General Computing->Telecom |
| Union Des Grands Crus | Community->Unions |
| United Galactic Commonwealth | Miscellaneous->Science Fiction |
| United Gamers Coalition | Community->Sports |
| United Gaming Clan | Community->Sports |
| United Glass Corporation | Business->Firms |
| University Governance Council | Academic & Science->Universities |
| University Grants Commission | Community->Educational Academic & Science->Universities Governmental->US Government |
| Unix Games Composer | Computing->Software |
| Upper Gulf of California | Academic & Science->Geology |
| Upsala General Catalog | Academic & Science->Astronomy |
| Urgenchl, Uzbekistan | Regional->Airport Codes |
| Urine Good Company | Miscellaneous->Funnies |
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