| U.R.S.S. | URSS |
| Ua Pou | Ua Pou |
| Uaboe | Uaboe |
| UAG Tecos | Tecos de la UAG |
| UAL | ALU |
| UART | UART |
| Uaxactun | Uaxactún |
| Ub | Oob |
| UB-FC Barcelone | FC Barcelona |
| Ubaldo Fillol | Ubaldo Fillol |
| Ubangi | Río Ubangui |
| Uberaba | Uberaba |
| Ubinas | Distrito de Ubinas |
| ubiquiste | ubicuo |
| ubiquitaire | ubicuo |
| Ubisoft | Ubisoft |
| UBS | UBS AG |
| UBS AG | UBS AG |
| Ubu Roi | Ubú Rey |
| Ubuntu | Ubuntu |
| Ubuntu Christian Edition | Ubuntu Christian Edition |
| Ubuntu Lite | Ubuntu Lite |
| UC Albinoleffe | Unione Calcio AlbinoLeffe |
| UC Sampdoria | Unione Calcio Sampdoria |
| UC Sampdoria Gênes | Unione Calcio Sampdoria |
| Uca | Uca pugnax |
| Uccle | Uccle |
| UCEMA | Universidad de CEMA |
| UCF Golden Knights | UCF Golden Knights |
| Uchiko | Uchiko |
| Uchronie | Ucronía |
| UCI ProTour | UCI ProTour |
| Uckermark | Distrito de Uckermark |
| UCLinux | ΜCLinux |
| UConn Huskies | UConn Huskies |
| UCT | unidad central de proceso |
| UD Barbastro | Unión Deportiva Barbastro |
| Udine | Udine |
| Udinese Calcio | Udinese Calcio |
| Udo Voigt | Udo Voigt |
| Udu | Udu |
| Udzima wa ya Masiwa | Udzima wa ya Masiwa |
| UE | Unión Europea |
| UE Sant Julià | Unió Esportiva Sant Julià |
| Uebeschi | Uebeschi |
| UEFA | UEFA |
| Uele | Uele |
| Uelzen | Distrito de Uelzen |
| Ueno | Ueno |
| Uetendorf | Uetendorf |
| UFA | Ufá |
| Ufhusen | Ufhusen |
| UFO | UFO |
| Ugao-Miraballes | Miravalles |
| Ugine | Ugine |
| UGK | UGK |
| ugli | ugli |
| Ugly Betty | Ugly Betty |
| Ugly Kid Joe | Ugly Kid Joe |
| Ugo Foscolo | Ugo Foscolo |
| Ugo Tognazzi | Ugo Tognazzi |
| Uharte-Arakil | Huarte-Araquil |
| Uherské Hradiště | Uherské Hradiště |
| uhlan | ulano |
| Uhuru | Uhuru |
| UI | Allium cepa |
| Uintah | Uintah |
| Uintathérium | Uintatherium |
| UK | Reino Unido |
| UK Singles Chart | UK singles chart |
| Ukko | Ukko |
| Ukmergė | Ukmergė |
| Ukraine | Ucrania |
| Ukraine International Airlines | Ukraine International Airlines |
| Ukrainien | ucraniano |
| Ukrainienne | ucraniana |
| Ukraïne | Ucrania |
| ukulélé | ukelele |
| UKUSA | UKUSA |
| Ukyo Katayama | Ukyo Katayama |
| Ulan-Bator | Ulán Bator |
| Ulcinj | Ulcinj |
| ulcère | úlcera |
| ulcère de l'estomac | úlcera péptica |
| Uldin | Uldin |
| Ulf Svante von Euler | Ulf von Euler |
| ULG¸ Université de Liège | Lieja |
| Ulic Qel-Droma | Ulic Qel-Droma |
| Ulises De La Cruz Bernardo | Ulises de la Cruz |
| Ulisse Aldrovandi | Ulisse Aldrovandi |
| Ull | Ull |
| Ullapool | Ullapool |
| Ullevi | Estadio Ullevi |
| Ulluco | Ullucus tuberosus |
| Ulm | Ulm |
| Ulmaceae | Ulmaceae |
| Ulmen | Ulmus minor |
| Ulpien | Ulpiano |
| Ulrica | Ulrica |
| Ulrich Zwingli | Ulrico Zuinglio |
| Ulrichen | Ulrichen |
| Ulrike Meinhof | Ulrike Meinhof |
| Ulrique | Ulrica |
| Ulrique Éléonore de Suède | Ulrica Leonor de Suecia |
| Ulster | Ulster |
| Ulster Defence Association | Asociación en Defensa del Ulster |
| Ultima I | Ultima I |
| Ultima II | Ultima II |
| Ultima IV | Ultima IV |
| Ultima IX Ascension | Ultima IX |
| Ultima V | Ultima V |
| Ultima VI | Ultima VI |
| Ultima VIII | Ultima VIII |
| Ultimate | Ultimate |
| Ultimate Iron Man | Ultimate Hombre de Hierro |
| Ultimate Spider-Man | Ultimate Spider-Man |
| ultimatum | ultimátum |
| ultime | concluyente |
| Ultra | ULTRA |
| Ultra basse fréquence | Ultra baja frecuencia |
| Ultra Extended Graphics Array | UXGA |
| Ultra haute fréquence | UHF |
| Ultra sensible | Ultrasensible |
| Ultra wideband | Ultrawideband |
| Ultra-confidentiel-le | De mayor confidencia |
| ultra-conservateur | ultraconservativo |
| Ultra-libéralisme | Ultraliberalismo |
| Ultra-léger motorisé | Aviación ultraligera |
| Ultra-Mobile PC | PC Ultra Móvil |
| ultra-rapide | de alta velocidad |
| ultra-secret | ultrasecreto |
| ultra-sonore | ultrasónico |
| Ultramoderne | Ultramoderno |
| Ultramontanisme | Ultramontanismo |
| ultranationalisme | ultranacionalismo |
| Ultraportatif | Minicomputadora portátil |
| Ultras | Ultras |
| Ultrasauros | Ultrasauros |
| Ultrasaurus | Ultrasaurus |
| ultrasecret | confidencial |
| ultrason | ultrasonido |
| ultrasonique | ultrasónico |
| ultrasonore | ultrasónico |
| ultraviolet | ultravioleta |
| Ultzama | Ulzama |
| ultérieurement | después |
| Uludj Ali | Uluj Alí |
| Ulugh Beg | Ulugh Beg |
| Uluru | Uluru |
| Ulva | Ulva |
| Ulva lactuca | Ulva lactuca |
| Ulyanovsk | Ulyanovsk |
| Ulysse | Odiseo |
| Ulysses | Ulysses |
| Ulysses Simpson Grant | Ulysses S. Grant |
| Uma Thurman | Uma Thurman |
| Umberto Boccioni | Umberto Boccioni |
| Umberto Eco | Umberto Eco |
| Umberto Giordano | Umberto Giordano |
| Umberto Nobile | Umberto Nobile |
| Umbrello UML Modeller | Umbrello |
| Umbriel | Umbriel |
| UMC | United Microelectronics Corporation |
| Umeboshi | Umeboshi |
| Umeå | Umeå |
| Umlaut heavy metal | Umlaut del heavy metal |
| Umm Qeis | Umm Qais |
| umma | umma |
| Ummo | Ummo |
| un | unidad |
| Un amour de grand-père | Old Money |
| Un Américain bien tranquille | El americano impasible |
| Un Américain à Paris | An american in Paris |
| un après l'autre | en sucesión |
