| Uehlfeld | Uehlfeld |
| Uele | Uele River |
| Uelen | Uelen |
| Uelzen | Uelzen |
| Uesugi Kagekatsu | Uesugi Kagekatsu |
| Uettingen | Uettingen |
| Ufa | Ufa |
| ufać | trust |
| UFO | Unidentified flying object |
| UFO w Emilcinie | Emilcin |
| Ufolągi | Pet Alien |
| ufortyfikowany | fortified |
| Ufozaury | Dinosaucers |
| UFS | Unix File System |
| ufundowanie | foundation |
| UG | UG |
| Uganda | Uganda |
| Ugandyjczyk | Ugandan |
| Ugandyjka | Ugandan |
| ugarycki | Ugaritic |
| Ugaryt | Ugarit |
| Ugedej | Ögedei Khan |
| Ugija | Mauritanian ouguiya |
| Ugine | Ugine |
| UGK | UGK |
| Uglicz | Uglich |
| Ugljan | Ugljan |
| Ugly Kid Joe | Ugly Kid Joe |
| Uglúk | List of Middle-earth Orcs |
| Ugocsa | Ugocsa |
| ugoda | agreement |
| Ugoda hadziacka | Treaty of Hadiach |
| Ugoda perejasławska | Treaty of Pereyaslav |
| Ugoda w Białej Cerkwi | Treaty of Bila Tserkva |
| Ugoda w Ostrowie | Ostrów Agreement |
| Ugoda zborowska | Treaty of Zboriv |
| Ugra | Ugra River |
| Ugrofinowie | Finno-Ugric peoples |
| Ugruntować | Affix |
| ugrupowanie | formation |
| ugryźć | bite |
| ugryźć się w język | bite one's tongue |
| UGW | EMU |
| ugór | fallow |
| UHD | Ultra High Definition Video |
| Uherské Hradiště | Uherské Hradiště |
| Uherský Brod | Uherský Brod |
| Uhingen | Uhingen |
| Uhla pstrodzioba | Surf Scoter |
| uhla zwyczajna | velvet scoter |
| Uhldingen-Mühlhofen | Uhldingen-Mühlhofen |
| Uhnów | Uhniv |
| UHT | Ultra-high-temperature processing |
| UIC | International Union of Railways |
| UIQ | UIQ |
| Uj | Uy River |
| Ujar | Uyar |
| ujawniać | reveal |
| ujawnienie | disclosure |
| ujawnić | disclose |
| Ujazd | Ujazd |
| ujednoznacznienie | disambiguation |
| ujemny | negative |
| Ujgur | Uyghur |
| ujgurski | Uyghur |
| Ujgurzy | Uyghur people |
| Ujun al-Atrus | Ayoun el Atrous |
| ujęcie | shot |
| ujście | estuary |
| UK | UK |
| UK Championship | UK Snooker Championship |
| UK garage | UK garage |
| Ukajali | Ucayali River |
| Ukaz emski | Ems Ukaz |
| ukazać | expose |
| ukazywać | appear |
| Ukemi | Ukemi |
| UKF | VHF |
| ukierunkowywać | direct |
| ukleja | ablet |
| ukochana | sweetheart |
| ukochany | sweetheart |
| ukojenie | alleviation |
| Ukoronować | Crown |
| Ukos | Slash |
