word | | Country name |
| United | United Kingdom | conventional long form: United Kingdom of Great Britain and Northern Ireland; note - Great Britain includes England, Scotland, and Wales conventional short form: United Kingdom abbreviation: UK |
| United | United States | conventional long form: United States of America conventional short form: United States abbreviation: US or USA |
| United | Virgin Islands | conventional long form: United States Virgin Islands conventional short form: Virgin Islands former: Danish West Indies abbreviation: USVI |
| Upper | Burkina Faso | conventional long form: none conventional short form: Burkina Faso local long form: none local short form: Burkina Faso former: Upper Volta, Republic of Upper Volta |
| Urdun | Jordan | conventional long form: Hashemite Kingdom of Jordan conventional short form: Jordan local long form: Al Mamlakah al Urduniyah al Hashimiyah local short form: Al Urdun former: Transjordan |
| Urduniyah | Jordan | conventional long form: Hashemite Kingdom of Jordan conventional short form: Jordan local long form: Al Mamlakah al Urduniyah al Hashimiyah local short form: Al Urdun former: Transjordan |
| Uruguay | Uruguay | conventional long form: Oriental Republic of Uruguay conventional short form: Uruguay local long form: Republica Oriental del Uruguay local short form: Uruguay former: Banda Oriental, Cisplatine Province |
| Urundi | Burundi | conventional long form: Republic of Burundi conventional short form: Burundi local long form: Republique du Burundi/Republika y'u Burundi local short form: Burundi former: Urundi |
| US | Burma | ... Union of Burma conventional short form: Burma local long form: Pyidaungzu Myanma Naingngandaw (translated by the US Government as Union of Myanma and by the Burmese as Union of Myanmar) local short ... |
| US | United States | conventional long form: United States of America conventional short form: United States abbreviation: US or USA |
| USA | United States | conventional long form: United States of America conventional short form: United States abbreviation: US or USA |
| used | Macedonia | ... short form: Macedonia local long form: Republika Makedonija local short form: Makedonija note: the provisional designation used by the UN, EU, and NATO is the Former Yugoslav Republic of Macedonia (FYROM) former ... |
| USVI | Virgin Islands | conventional long form: United States Virgin Islands conventional short form: Virgin Islands former: Danish West Indies abbreviation: USVI |
| Uzbek | Uzbekistan | conventional long form: Republic of Uzbekistan conventional short form: Uzbekistan local long form: Ozbekiston Respublikasi local short form: Ozbekiston former: Uzbek Soviet Socialist Republic |
| Uzbekistan | Uzbekistan | conventional long form: Republic of Uzbekistan conventional short form: Uzbekistan local long form: Ozbekiston Respublikasi local short form: Ozbekiston former: Uzbek Soviet Socialist Republic |
| Uzma | Libya | ... long form: Great Socialist People's Libyan Arab Jamahiriya conventional short form: Libya local long form: Al Jumahiriyah al Arabiyah al Libiyah ash Shabiyah al Ishtirakiyah al Uzma local short form: none |
| Vabariik | Estonia | conventional long form: Republic of Estonia conventional short form: Estonia local long form: Eesti Vabariik local short form: Eesti former: Estonian Soviet Socialist Republic |
| Vanuatu | Vanuatu | conventional long form: Republic of Vanuatu conventional short form: Vanuatu local long form: Ripablik blong Vanuatu local short form: Vanuatu former: New Hebrides |
| Vatican | Holy See (Vatican City) | conventional long form: The Holy See (State of the Vatican City) conventional short form: Holy See (Vatican City) local long form: Santa Sede (Stato della Citta del Vaticano) local short form: Santa ... |
| Vaticano | Holy See (Vatican City) | ... Holy See (State of the Vatican City) conventional short form: Holy See (Vatican City) local long form: Santa Sede (Stato della Citta del Vaticano) local short form: Santa Sede (Citta del Vaticano |
| velo | Georgia | conventional long form: none conventional short form: Georgia local long form: none local short form: Sak'art'velo former: Georgian Soviet Socialist Republic |
| Venezuela | Venezuela | conventional long form: Bolivarian Republic of Venezuela conventional short form: Venezuela local long form: Republica Bolivariana de Venezuela local short form: Venezuela |