U
- UgandaCountry in East Africa
- Ugandan shillingCurrency of Uganda
- UkraineCountry in Eastern Europe
- Ulster EnglishVariety of English spoken in Northern Ireland
- Ulster ProtestantsEthnoreligious group of the historic Irish province of Ulster
- Unification of Moldavia and Wallachia1859 formation of the modern Romanian state
- Unitary parliamentary republicForm of government
- United Arab EmiratesCountry in West Asia
- United Nations Buffer Zone in CyprusUN-administered demilitarised zone on Cyprus
- United Nations geoscheme for AfricaThe following is an alphabetical list of subregions in the United Nations geoscheme for Af
- United Principalities of Moldavia and Wallachia1859–1881 personal union and early form of the modern Romanian state
- Unity makes strengthMotto of many countries throughout history
- Upper houseChamber of a bicameral legislature
- UruguayCountry in South America
- Uttar PradeshState in northern India
- UttradLinguistic and Historical Region of Sindh
- UzbekistanCountry in Central Asia
- UzbeksTurkic ethnic group of Central Asia