| Uniform Resource Locator | URL |
| UNII-banden | UNII-bånd |
| Unikod | Unicode |
| Unilever | Unilever |
| Unimog | Unimog |
| union | union |
| Union démocratique bretonne | Bretonsk Demokratisk Sammenslutning |
| Union internationale des chemins de fer | UIC |
| Union Jack | Storbritanniens flag |
| Unionsflagga | Storbritanniens flag |
| UNITA | UNITA |
| Unitarism | Unitarisme |
| United Airlines | United Airlines |
| United Methodist Church | Metodisme |
| United Nations Environment Programme | United Nations Environment Programme |
| United Nations Framework Convention on Climate Change | UNFCCC |
| United Nations Office on Drugs and Crime | United Nations Office on Drugs and Crime |
| United States Air Force | United States Air Force |
| United States Army | United States Army |
| United States dollar | Amerikanske dollar |
| United States Military Academy | West Point |
| Universal Media Disc | Universal Media Disc |
| Universal Product Code | Universal Product Code |
| Universal Studios | Universal Studios |
| Universala Esperanto-Asocio | UEA |
| Universaliestriden | Striden om almenbegreberne |
| universitet | universitet |
| Universitetet i Cambridge | Cambridge Universitet |
| Universitetet i Leiden | Universiteit Leiden |
| Universitetet i Oslo | Universitetet i Oslo |
| Universitetssjukhus | Universitetshospital |
| universitetsundervisning | videregåennde uddannelse |
| University of Chicago | University of Chicago |
| University of Hawaii | University of Hawaii |
| University of Pennsylvania | University of Pennsylvania |
| University of Washington | University of Washington |
| universum | univers |
| Unix | UNIX |
| Unkas Anka | Ejderen |
| Unnur Birna Vilhjálmsdóttir | Unnur Birna Vilhjálmsdóttir |
| UNO | Uno |
| UNO-City | Vienna International Centre |
| UNPROFOR | United Nations Protection Force |
| Unrepresented Nations and Peoples Organisation | UNPO |
| Uns | Unse |
| unsuspecting | blåøjet |
| Unter den Linden | Unter den Linden |
| ununbium | ununbium |
