| Ungdomshuset | Ungdomshuset |
| ungulate | hovdyr |
| unheard-of | uhørt |
| Unicode | Unicode |
| unicorn | enhjørning |
| unicycle | unicykel |
| Unidad Popular | Unidad Popular |
| unidentified | uidentificeret |
| Unidentified flying object | Ufo |
| Uniejów | Uniejów |
| Unification Church | Moon-bevægelsen |
| Unification of Germany | Tysklands genforening |
| Unified Modeling Language | UML |
| Uniform Resource Locator | URL |
| Uniformitarianism | Aktualitetsprincippet |
| uniformity | ensartethed |
| Unilever | Unilever |
| Unimog | Unimog |
| uninterested | uinteresseret |
| Union | Syndikat |
| Union between Sweden and Norway | Den svensk-norske union |
| Union Centroamericana de Fútbol | Unión Centroamericana de Fútbol |
| Union Cycliste Internationale | UCI |
| Union Démocratique Bretonne | Bretonsk Demokratisk Sammenslutning |
| Union Flag | Storbritanniens flag |
| Union for a Popular Movement | UMP |
| Union Jack | Storbritanniens flag |
| Union of South Africa | Unionen Sydafrika |
| Union of Soviet Socialist Republics | Sovjetunionen |
| Union of the Comoros | Comorerne |
| Union Party | Sambandsflokkurin |
| Union Theological Seminary in the City of New York | Union Theological Seminary |
| unique | eneste |
| Unique key | Nøgle |
| Unique Master Citizen Number | Personligt identifikationsnummer |
| Uniracers | Unirally |
| Uniramia | Uniramia |
| unit | ener |
| unit vector | enhedsvektor |
| UNITA | UNITA |
| Unitarianism | Unitarisme |
| Unitarisation | Unitarisme |
| Unitarisk Kirkesamfund | Unitarisk Kirkesamfund |
| Unitary matrix | Unitær matrix |
| Unitary state | Enhedsstat |
| unite | proletarer i alle lande |
| United Airlines | United Airlines |
| United Arab Emirates | Forenede Arabiske Emirater |
| United Arab Emirates dirham | Dirham |
| United Arab Republic | Forenede Arabiske Republik |
| United Islamic Front for the Salvation of Afghanistan | Den Nordlige Alliance |
| United Kingdom | Forenede Kongerige |
| United Kingdom of Great Britain and Northern Ireland | Forenede Kongerige |
| United Kingdom of the Netherlands | Kongeriget Nederlandene |
| United Methodist Church | Metodisme |
| United Mexican States | Mexico |
| United Nations | De Forenede Nationer |
| United Nations African Union Mission in Darfur | United Nations African Union Mission in Darfur |
| United Nations Charter | De Forenede Nationers Pagt |
| United Nations Children's Fund | UNICEF |
| United Nations Day | FN-dag |
| United Nations Development Programme | UNDP |
| United Nations Environment Programme | United Nations Environment Programme |
| United Nations Framework Convention on Climate Change | UNFCCC |
| United Nations Industrial Development Organization | UNIDO |
| United Nations Office at Vienna | Vienna International Centre |
| United Nations Office on Drugs and Crime | United Nations Office on Drugs and Crime |
| United Nations Organization | Forenede Nationer |
| United Nations Population Fund | UNFPA |
| United Nations Protection Force | United Nations Protection Force |
| United Nations Relief and Rehabilitation Administration | UNRRA |
| United Republic of | Tanzania |
| United States | Amerikas Forenede Stater |
| United States Air Force | United States Air Force |
| United States Army | United States Army |
| United States Army Air Forces | Aphex Twin |
| United States Army Special Forces | United States Army Special Forces |
| United States Attorney General | Department of Justice |
| United States Cabinet | Kabinet |
| United States Capitol | Kapitol |
| United States Coast Guard | United States Coast Guard |
| United States Congress | Kongressen |
| United States Constitution | USA's forfatning |
| United States Department of Defense | Det amerikanske forsvarsdepartement |
| United States Department of Justice | Department of Justice |
| United States Department of State | Det amerikanske udenrigsministerium |
| United States dollar | Amerikanske dollar |
| United States Holocaust Memorial Museum | United States Holocaust Memorial Museum |
