| UEFA | UEFA |
| Uele | Uele River |
| Uelen | Uelen |
| Uetendorf | Uetendorf |
| uf | ugh |
| ufano | smug |
| ufanía | smugness |
| Ufhusen | Ufhusen |
| UFO | UFO |
| UFO Baby | UFO Baby |
| UFO Robo Grendizer | Grendizer |
| ufología | ufology |
| UFS | Unix File System |
| Ufá | Ufa |
| Uganda | Uganda |
| ugandesa | Ugandan |
| ugandés | Ugandan |
| Ugarit | Ugarit |
| Ugarítico | Ugaritic language |
| Ugedei | Ögedei Khan |
| Ugine | Ugine |
| UGK | UGK |
| ugli | ugli |
| Ugly Betty | Ugly Betty |
| Ugly Kid Joe | Ugly Kid Joe |
| Ugni molinae | Ugni molinae |
| Ugo Foscolo | Ugo Foscolo |
| Ugo Tognazzi | Ugo Tognazzi |
| Ugra | Ugra River |
| UHDV | Ultra High Definition Video |
| Uherské Hradiště | Uherské Hradiště |
| UHT | Ultra-high-temperature processing |
| Uhuru | Uhuru |
| Uige | Uíge |
| uigur | Uyghur |
| Uintatherium | Uintatherium |
| UIQ | UIQ |
| Uitlanders | Uitlander |
| uja | ukha |
| Ujae | Ujae Atoll |
| Ujelang | Ujelang Atoll |
| ujier | usher |
| Ujtá | Ukhta |
| UK garage | UK garage |
| UK Hall of fame | UK Music Hall of Fame |
| UK singles chart | UK Singles Chart |
| UKAEA | United Kingdom Atomic Energy Authority |
| Uke Mochi | Uke Mochi |
| ukelele | ukulele |
| ukelín | ukelin |
| Ukko | Ukko |
| Ukmergė | Ukmergė |
| Ukraine International Airlines | Ukraine International Airlines |
| UKUSA | UKUSA Community |
| Ukyo Katayama | Ukyo Katayama |
| Uladzimir Karvat | Uładzimir Karvat |
| ulano | uhlan |
| ulcerarse | fester |
| ulceroso | ulcerous |
| Ulcinj | Ulcinj |
| Uldin | Uldin |
| Ulead Systems | Ulead Systems |
| Ulex europaeus | Common Gorse |
| ulexita | ulexite |
| Ulf von Euler | Ulf von Euler |
| Ulfilas | Ulfilas |
| Ulic Qel-Droma | Ulic Qel-Droma |
| Ulises | Ulysses |
| Ulises de la Cruz | Ulises de la Cruz |
| Ulisse Aldrovandi | Ulisse Aldrovandi |
| Uliánovsk | Ulyanovsk |
| Ull | Ullr |
| Ullapool | Ullapool |
| Ullucus tuberosus | Ulluco |
| Ulm | Ulm |
| Ulmaceae | Ulmaceae |
| Ulmus | Elm |
| Ulmus minor | Elm |
| Ulpiano | Ulpian |
| Ulrica | Ulrica |
| Ulrica Leonor de Suecia | Ulrika Eleonora of Sweden |
| Ulrich Jasper Seetzen | Ulrich Jasper Seetzen |
| Ulrichen | Ulrichen |
| Ulrico de Augsburgo | Ulrich of Augsburg |
| Ulrico Zuinglio | Huldrych Zwingli |
| Ulrike Meinhof | Ulrike Meinhof |
| Ulster | Ulster |
| ulterior | ulterior |
| Ultimate Hombre de Hierro | Ultimate Iron Man |
| Ultimate Spider-Man | Ultimate Spider-Man |
| ultimo | last |
| ultimátum | ultimatum |
| Ultra baja frecuencia | Ultra low frequency |
| ultraconservativo | ultraconservative |
| ultraderecha | ultraright |
| ultraderechista | far-right |
| ultraestructura | ultrastructure |
| ultrahombre | Superman |
| ultraizquierda | far left |
| ultrajante | abusive |
| ultrajar | outrage |
| ultraje | offense |
