| Uniform Resource Locator | Uniform Resource Locator |
| UNII-bånd | U-NII |
| Unilever | Unilever |
| Unimog | Unimog |
| Union Theological Seminary | Union Theological Seminary in the City of New York |
| Unionen Sydafrika | Union of South Africa |
| Unirally | Uniracers |
| Uniramia | Uniramia |
| UNITA | UNITA |
| Unitarisk Kirkesamfund | Unitarisk Kirkesamfund |
| Unitarisme | Unitarianism |
| United Airlines | United Airlines |
| United Nations African Union Mission in Darfur | United Nations African Union Mission in Darfur |
| United Nations Environment Programme | United Nations Environment Programme |
| United Nations Office on Drugs and Crime | United Nations Office on Drugs and Crime |
| United Nations Protection Force | United Nations Protection Force |
| United States Air Force | United States Air Force |
| United States Army | United States Army |
| United States Army Special Forces | United States Army Special Forces |
| United States Coast Guard | United States Coast Guard |
| United States Holocaust Memorial Museum | United States Holocaust Memorial Museum |
| United States Marine Corps | United States Marine Corps |
| United States Navy | United States Navy |
| Unitær matrix | Unitary matrix |
| univers | universe |
| Universal Media Disc | Universal Media Disc |
| Universal Plug and Play | Universal Plug and Play |
| Universal Product Code | Universal Product Code |
| Universal Serial Bus | Universal Serial Bus |
| Universal Studios | Universal Studios |
| Universal Transverse Mercator | Universal Transverse Mercator coordinate system |
| Universet | Universe |
| Universiteit Leiden | Leiden University |
| Universiteit van Amsterdam | Universiteit van Amsterdam |
| universitet | academy |
| Universitetet i Oslo | University of Oslo |
| Universitetshospital | University hospital |
| University of Chicago | University of Chicago |
| University of Hawaii | University of Hawaii |
| University of Pennsylvania | University of Pennsylvania |
| University of St Andrews | University of St Andrews |
| University of Tasmania | University of Tasmania |
| University of Washington | University of Washington |
| UNIX | Unix |
| Unix-skal | Unix shell |
| Unión Centroamericana de Fútbol | Union Centroamericana de Fútbol |
| Unnur Birna Vilhjálmsdóttir | Unnur Birna Vilhjálmsdóttir |
| Uno | Uno |
| unormal | abnormal |
| UNPO | Unrepresented Nations and Peoples Organization |
| UNRRA | United Nations Relief and Rehabilitation Administration |
| Unse | Ounce |
| Unst | Unst |
| Unsuk Chin | Unsuk Chin |
| Unter den Linden | Unter den Linden |
| Untitled | Untitled Korn album |
| ununbium | ununbium |
| ununhexium | ununhexium |
| ununoctium | ununoctium |
| ununpentium | ununpentium |
| ununquadium | ununquadium |
| ununseptium | ununseptium |
| ununtrium | ununtrium |
| unødvendig | unnecessary |
| uofficiel | unofficial |
| uopløseligt stof | insoluble substance |
| uorden | disorder |
| uorganisk forurenende stof | inorganic pollutant |
| uorganisk kemi | inorganic chemistry |
| uorganisk stof | inorganic substance |
| uortodoks | unorthodox |
| up-kvark | up quark |
| upasteuriseret | unpasteurized |
| Upload og download | Uploading and downloading |
| Uppland | Uppland |
| Upplands Väsby | Upplands Väsby |
| Uppsala | Uppsala |
| Uppsala län | Uppsala County |
| Uppsala universitet | Uppsala University |
| Uppvidinge kommun | Uppvidinge Municipality |
| uprofessionel | unprofessional |
| upålidelig | unreliable |
| Uqbar | Uqbar |
| ur | clock |
| ur- | ur- |
| Uracil | Uracil |
| Uralbjergene | Ural Mountains |
| Uralfloden | Ural |
| Urals føderale distrikt | Urals Federal District |
| Uralske sprog | Uralic languages |
| uran | uranium |
| Urania | Urania |
| Uranienborg | Uraniborg |
| Uranus | Uranus |
| urapporteret | unreported |
| Urartu | Urartu |
| Urban fantasy | Urban fantasy |
| urbanisering | urbanisation |
| Urbino | Urbino |
| Urd | Urd |
| Urdu | Urdu |
| uren | dirty |
| Uret | Clock |
| uretfærdig straf | false punishment |
| urfugl | black grouse |
| Urho Kekkonen | Urho Kekkonen |
| Uri | Uri |
| Uriaspost | Uriah the Hittite |
| Uridindifosfat | Uridine diphosphate |
| Uridinmonofosfat | Uridine monophosphate |
| Uridintrifosfat | Uridine triphosphate |
| Urim og Tummim | Urim and Thummim |
| urin | urine |
| urinal | urinal |
| urinale | urinal |
| urinblære | urinary bladder |
| urinere | urinate |
| Urinstof | Urea |
| Urkristendommen | Early Christianity |
| URL | Uniform Resource Locator |
| urmager | watchmaker |
| Urmia | Urmia |
| Urmila Matondka | Urmila Matondkar |
| Urnemarkskulturen | Urnfield culture |
| Urnemarkskulturens talsystem | Urnfield culture numerals |
| Urnes stavkirke | Urnes stave church |
| uro | unrest |
| Uroš Murn | Uroš Murn |
| Ursidae | ursid |
| Ursula Andress | Ursula Andress |
| urtepotte | flowerpot |
| Uruguay | Uruguay |
| uræmi | uremia |
| US Open | US Open |
| US PGA Championship | PGA Championship |
| USA | United States |
| USA PATRIOT Act | USA PATRIOT Act |
| USA's centralbank | Federal Reserve System |
| USA's forfatning | United States Constitution |
| USA's uafhængighedskrig | American Revolutionary War |
| usand | untrue |
| usandhed | untruth |
| USB | USB |
| usb-nøgle | flash drive |
| usb-stik | flash drive |
| Usbebiske SSR | Uzbek SSR |
| Usbekiske Sovjetsocialistiske Republik | Uzbek SSR |
| Usbekistan | Uzbekistan |
| Usedom | Usedom |
| usejr | defeat |
| Ushuaia | Ushuaia |
| usikker | doubtful |
| Uslar | Uslar |
| Usopp | Usopp |
| USS Enterprise | USS Enterprise |
| USS Maine | USS Maine |
| USS Nautilus | USS Nautilus |
| USSOCOM | United States Special Operations Command |
| Ustaše | Ustaše |
| ustemt | voiceless |
| usteriliserbar | unsterilizable |
| Ustka | Ustka |
| Utada Hikaru | Utada Hikaru |
| Utah | Utah |
| Utah Beach | Utah Beach |
| utaknemmelig | thankless |
| utallig | countless |
| UTC | Coordinated Universal Time |
| Uther Pendragon | Uther Pendragon |
| utilgivelig | unpardonable |
| Utilitarisme | Utilitarianism |
| Utopi | Utopia |
| Utopisk | Utopian |
| Utrecht | Utrecht |
| utroskab | unfaithfulness |
| Utsira | Utsira |
| Uttar Pradesh | Uttar Pradesh |
| Utu | Utu |
| utvivlsom | unequivocal |
| utvivlsomt | doubtlessly |
| utæthed | leakage |
