| U Air | Uair |
| U Nu | U Nu |
| U Roy | U-Roy |
| U Thant | U Thant |
| U Thant Island | U Thant Island |
| U Turn | U Turn |
| U-boot | U-boat |
| U-Foes | U-Foes |
| U-Tapao | U-Tapao |
| U.R.S.S. | USSR |
| Ua Pou | Ua Pu |
| Uaboe | Uaboe |
| UAG Tecos | Universidad Autónoma de Guadalajara |
| UAL | ALU |
| Uaxactun | Uaxactun |
| UAZ | UAZ |
| UB-FC Barcelone | UB-Barça |
| Ubaldo Fillol | Ubaldo Fillol |
| Ubangi | Ubangi River |
| Ubayd Allah al-Mahdi | Ubayd Allah al-Mahdi Billah |
| Ube | Ube |
| Ubenide | Ubenide |
| Uberaba | Uberaba |
| Ubiens | Ubii |
| Ubinas | Ubinas |
| ubiquiste | ubiquitous |
| ubiquitaire | ubiquitous |
| ubiquité | ubiquity |
| Ubisoft | Ubisoft |
| Ubon Ratchathani | Ubon Ratchathani |
| UBS | UBS AG |
| UBS AG | UBS AG |
| Ubu | UBU |
| Ubu Roi | Ubu Roi |
| Ubuntu Lite | Ubuntu Lite |
| UC | CPU |
| UCB Pharma | UCB |
| Uccle | Uccle |
| UCEMA | Universidad del CEMA |
| UCF | University of Central Florida |
| Uchi deshi | Uchi-deshi |
| Uchronie | Alternate history |
| Uchû no Stellvia | Stellvia of the Universe |
| UCI ProTour | UCI ProTour |
| Uckermark | Uckermark |
| UCLinux | ΜClinux |
| UCT | CPU |
| UD Barbastro | UD Barbastro |
| Uda | Emperor Uda |
| Udayādityavarman II | Udayadityavarman II |
| Uddevalla | Uddevalla |
| Udine | Udine |
| Udinese Calcio | Udinese Calcio |
| Udligenswil | Udligenswil |
| UDO | Udo |
| Udo de Neustrie | Udo of Neustria |
| Udo Dirkschneider | Udo Dirkschneider |
| Udo Voigt | Udo Voigt |
| udon | udon |
| Udon Thani | Udon Thani |
| Udu | Udu |
| Udzima wa ya Masiwa | Udzima wa ya Masiwa |
| UE | European Union |
| UE Sant Julià | UE Sant Julià |
| Uebeschi | Uebeschi |
| Uechi-ryū | Uechi-ryū |
| Ueckermünde | Ueckermünde |
| UEFA | UEFA |
| Ueken | Ueken |
| Uele | Uele River |
| Uelzen | Uelzen |
| UER | EBU |
| Uerkheim | Uerkheim |
| Uesslingen-Buch | Uesslingen-Buch |
| Uetendorf | Uetendorf |
| Uetikon am See | Uetikon am See |
| Uettingen | Uettingen |
| Uezwil | Uezwil |
| UF | UF |
| Ufhusen | Ufhusen |
| UFO | UFO |
| ufologue | ufologist |
| UG | UG |
| UG Grindavík | Knattspyrnudeild UMFG |
| Uganda Revenue Authority | Uganda Revenue Authority SC |
| Ugao-Miraballes | Ugao-Miraballes |
| Ugine | Ugine |
| UGK | UGK |
| ugli | ugli |
| Ugljan | Ugljan |
| Ugljevik | Ugljevik |
| Ugly Betty | Ugly Betty |
| Ugly Kid Joe | Ugly Kid Joe |
| Uglúk | List of Middle-earth Orcs |
| Ugo Foscolo | Ugo Foscolo |
| Ugo Tognazzi | Ugo Tognazzi |
| Ugolin | Ugolino della Gherardesca |
| Ugyen Wangchuk | Ugyen Wangchuck |
| Uharte-Arakil | Uharte-Arakil |
| Uherské Hradiště | Uherské Hradiště |
| uhlan | uhlan |
| UHT | UHT |
| Uhuru | Uhuru |
| Uhyst | Uhyst |
| UI | UI |
| Uijeongbu | Uijeongbu |
| Uintathérium | Uintatherium |
| Uitdam | Uitdam |
| Uitikon | Uitikon |
| Uiwang | Uiwang |
| UJ | UJ |
| Ujiji | Ujiji |
| Ujizane Imagawa | Imagawa Ujizane |
| Ujście | Ujście |
| UK | UK |
| UK Singles Chart | UK Singles Chart |
| ukase | ukase |
| ukiyo-e | ukiyo-e |
| Ukko | Ukko |
| Ukmergė | Ukmergė |
| Ukonvasara | Ukonvasara |
| Ukraine | Ukraine |
| Ukraine International Airlines | Ukraine International Airlines |
| Ukrainia Zalinitza | Ukrzaliznytsia |
| Ukrainian Falcons | Ukrainian Falcons |
| Ukrainien | Ukrainian |
| Ukrainienne | Ukrainian |
| Ukraïne | Ukraine |
| ukulélé | ukulele |
| UKUSA | UKUSA Community |
| Ukyo Katayama | Ukyo Katayama |
| UL | UL |
| Ulaan Chab | Ulanqab |
| Ulaangom | Ulaangom |
| Uladzimir Karatkievic | Uładzimir Karatkievič |
| Ulan Hot | Ulan Hot |
