| U Thant | U Thant |
| U-Bahn | U-Bahn |
| U-bend | Vandlås |
| U-boat | Undervandsbåd |
| U-bolt | Bue |
| U-NII | UNII-bånd |
| U-turn | U-vending |
| U.S. | Amerikas Forenede Stater |
| U.S. of A. | Amerikas Forenede Stater |
| U.S.A. | Amerikas Forenede Stater |
| UB-Barça | FC Barcelona |
| Ubbe Ragnarsson | Ubbe |
| uber- | mega- |
| Ubermensch | Superman |
| ubiquitous | allestedsnærværende |
| Ubiquitous computing | Pervasive computing |
| Ubisoft | Ubisoft |
| UCI ProTour | UCI ProTour |
| UCI Road World Cup | UCI World Cup |
| UCI World Championships | VM i landevejscykling |
| Uday Hussein | Uday Hussein |
| Udayapur District | Udayapur District |
| udder | yver |
| Uddjaure | Uddjaure |
| Udine | Udine |
| Udinese Calcio | Udinese Calcio |
| Udmurtia | Udmurtien |
| Udo Voigt | Udo Voigt |
| Ueckermünder Heide | Wkrzanska Skov |
| UEFA | UEFA |
| UEFA Champions League | UEFA Champions League |
| UEFA Cup | UEFA Cup |
| UEFA European Football Championship | Europamesterskab |
| UEFA Fair Play ranking | DBUs fair play-konkurrence |
| UEFA Intertoto Cup | UEFA Intertoto Cup |
| UEFA Super Cup | UEFA Super Cup |
| Uetersen | Uetersen |
| Uffizi | Galleria degli Uffizi |
| UFO | Ufo |
| Uganda | Uganda |
| ugli | ugli |
| ugly | grim |
| Ugly Betty | Ugly Betty |
| ugly duckling | grim ælling |
| uh | øh |
| UI | Løg |
| Uighur | Uighur |
| Uigur | Uighur |
| UK | Forenede Kongerige |
| UK police ranks | Politirang Det Forenede Kongerige |
| UK postcodes | Postnummer |
| UK Singles Chart | UK Singles Chart |
| Ukraina | Ukraine |
| Ukraina Stadium | Ukraine |
| Ukraine | Ukraine |
| Ukrainian | Ukrainsk |
| Ukrainian hryvnia | Hryvnia |
| Ukrainian language | Ukrainsk |
| Ukrainian man | Ukrainsk |
| Ulaanbaatar | Ulan Bator |
| Ulan Bator | Ulan Bator |
| Ulcinj | Ulcinj |
| Ulfborg-Vemb | Ulfborg-Vemb Kommune |
| Ulfilas | Wulfila |
| Uli Hoeneß | Uli Hoeness |
| Ulla | Ulla |
| Ullensaker | Ullensaker |
| Ullensvang | Ullensvang |
| Ullern | Ullern |
| Ullerslev municipality | Ullerslev Kommune |
| Ullevi | Ullevi |
| Ullevål University Hospital | Ullevål universitetssygehus |
| Ullr | Ull |
| Ulm | Ulm |
| Ulmaceae | Elme-familien |
| Ulmen | Elm |
| Ulmus laevis | Skærm-Elm |
| Ulric | Ulrik |
| Ulrica | Ulrikka |
| Ulrich | Ulrik |
| Ulrich Roth | Ulrich Roth |
| Ulrik le Fevre | Ulrik le Fevre |
| Ulrike Meinhof | Ulrike Meinhof |
| Ulsan | Ulsan |
| Ulstein | Ulstein |
| Ulster | Ulster |
| ulterior motive | bagtanke |
| ultimately | endelig |
| ultimatum | ultimatum |
| Ultimatum game | Ultimatumspillet |
| Ultra short wave | VHF |
| Ultra-high-temperature processing | UHT-behandling |
| Ultra-light | Ultralet fly |
| Ultra-short wave | VHF |
| Ultra-wideband | UWB |
| Ultralight aviation | Ultralet fly |
| Ultras | Ultras |
| Ultrasonic sound | Ultralyd |
| ultrasound | ultralyd |
| Ultraviolet | Ultraviolet lys |
| Ultraviolet index | UV-index |
| ultraviolet light | ultraviolet lys |
| ultraviolet radiation | ultraviolet stråling |
| Uluru | Uluru |
| Uluru-Kata Tjuta National Park | Uluru-Kata Tjuta National Parken |
| Ulva lactuca | Havsalat |
| Ulvik | Ulvik |
| Ulyanovsk | Uljanovsk |
| Ulysses | Odysseus |
| Ulysses S. Grant | Ulysses S. Grant |
| Uma Thurman | Uma Thurman |
| Umar | Umar ibn al-Khattab |
| Umayyad | Ummayyaderne |
| Umba River | Umba |
| Umber fish | Stalling |
| Umberto Boccioni | Umberto Boccioni |
| Umberto Eco | Umberto Eco |
| Umberto Giordano | Umberto Giordano |
| umbilicus | navle |
| umbrella | paraply |
| umbrella organisation | paraplyorganisation |
| Umbria | Umbria |
| Umbriel | Umbriel |
| UMD | Universal Media Disc |
| Umeå | Umeå |
| Umeå Municipality | Umeå |
| Umeå School of Business | Handelshögskolan i Umeå |
| Umeå University | Umeå Universitet |
| umlaut | omlyd |
| Umm Qasr | Umm Qasr |
| Umma | Umma |
| UN | De Forenede Nationer |
| Un ballo in maschera | Maskeballet |
| UN Charter | De Forenede Nationers Pagt |
| Un chien andalou | Den andalusiske hund |
| UN Convention on the Rights of the Child | Børnekonventionen |
| Un giorno di regno | Un giorno di regno |
| UN Peacemaker | UN Peacemaker |
| UN Security Council | Sikkerhedsråd |
