Lithuania is a country that is part of the European Union.
Lithuania ( UK and US : [ lɪθuː ` eɪniə ] , Lietuva [ lʲɪɛtʊˈvɐ ] ) , officially the Republic of Lithuania ( [ Lietuvos Respublika , links = no ] ) , is a country in Northern Europe . Lithuania is a member of the European Union , the Council of Europe , a full member of the Eurozone , Schengen Agreement and NATO . Lithuania has been among the fastest growing economies in the European Union and is ranked 21st in the world in the Ease of Doing Business Index .