| u-båtar | submarines |
| U-dal | U-shaped valley |
| u-land | developing country |
| u-länder | developing country |
| U-motor | U engine |
| U-sväng | U-turn |
| U.S.A. | United States |
| Ua Pou | Ua Pu |
| UAAR | Italian Union of Rationalist Atheists and Agnostics |
| Uaboe | Uaboe |
| UAE-dirham | United Arab Emirates dirham |
| UAG Tecos | Universidad Autónoma de Guadalajara |
| UAZ | UAZ |
| Ubaid | Ubaid period |
| Ubaldo Fillol | Ubaldo Fillol |
| Ubar | Iram of the Pillars |
| Ubenide | Ubenide |
| Uberaba | Uberaba |
| Ubikvitetsläran | Ubiquitarians |
| Ubisoft | Ubisoft |
| UBS | UBS AG |
| Ubuntu-libre | GNewSense |
| ubåt | submarine |
| ubåtsbekämpande | antisubmarine |
| Ubåtsklass Typ IX | German Type IX submarine |
| Ubåtsklass Typ VII | German Type VII submarine |
| Ubåtsklass Typ XIV | German Type XIV submarine |
| UCAV | Unmanned Combat Air Vehicle |
| Uchi Hiroki | Hiroki Uchi |
| Uchideshi | Uchi-deshi |
| Uchta | Ukhta |
| UCI | Union Cycliste Internationale |
| UCI ProTour | UCI ProTour |
| Ud | Oud |
| UD Almería | UD Almería |
| UD Las Palmas | UD Las Palmas |
| UD Salamanca | UD Salamanca |
| UD Vecindario | UD Vecindario |
| Uday Hussein | Uday Hussein |
| UDBA | UDBA |
| udd | point |
| udda | odd |
| Uddatalsmetoden | Sainte-Laguë method |
| udde | cape |
| Uddevalla kommun | Uddevalla Municipality |
| Uddevallabron | Uddevalla Bridge |
| UDDI | Universal Description Discovery and Integration |
| Uddjaure | Uddjaure |
| uddlös | pointless |
| Udine | Udine |
| Udinese Calcio | Udinese Calcio |
| Udmurter | Udmurt people |
| Udmurtien | Udmurtia |
| Udmurtiska | Udmurt language |
| Udo Dirkschneider | Udo Dirkschneider |
| Udo Kiessling | Udo Kiessling |
| Udon Thani | Udon Thani |
| Udzima wa ya Masiwa | Udzima wa ya Masiwa |
| UE Lleida | UE Lleida |
| Uebeschi | Uebeschi |
| UEFA | UEFA |
| UEFA Champions League | UEFA Champions League |
| UEFA Intertoto Cup | UEFA Intertoto Cup |
| UEFA Super Cup | UEFA Super Cup |
| UEFA-cupen | UEFA Cup |
| Ueken | Ueken |
| Uele | Uele River |
| Uelen | Uelen |
| Uerkheim | Uerkheim |
| Uetendorf | Uetendorf |
| Uezwil | Uezwil |
| Ufa | Ufa |
| Uffizierna | Uffizi |
| ufo | UFO |
| Uganda | Uganda |
| Ugandas flagga | Flag of Uganda |
| Ugandas fotbollslandslag | Uganda national football team |
| Ugandas historia | History of Uganda |
| Ugandas statsvapen | Coat of arms of Uganda |
| ugandier | Ugandan |
| Ugarit | Ugarit |
| Ugaritiska alfabetet | Ugaritic alphabet |
| uggla | owl |
| ugglelik | owlish |
