Foreign relations of Lithuania

The Baltic Assembly (BA) is a regional organisation that promotes intergovernmental cooperation between Estonia, Latvia, and Lithuania. It attempts to find a common position in relation to many international issues, including economic, political and cultural issues. The decisions of the assembly are advisory.

The New Hanseatic League, or the Hansa, also called the Hanseatic League 2.0, was established in February 2018 by European Union finance ministers from Denmark, Estonia, Finland, Ireland, Latvia, Lithuania, the Netherlands and Sweden through the signing of a two-page foundational document that set out the "shared views and values in the discussion on the architecture of the Economic and Monetary Union of the European Union (EMU)". The name is derived from the Hanseatic League, a Northern European commercial and defensive league which lasted until the 16th century.

The Bucharest Nine or the Bucharest Format (B9 or B-9; Romanian: Formatul București, Polish: Bukaresztańska Dziewiątka) is an organization founded on 4 November 2015 in Bucharest, Romania, at the initiative of the President of Romania Klaus Iohannis and the President of Poland Andrzej Duda during a bilateral meeting between them. Its members are Bulgaria, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Romania and Slovakia. Its appearance was mainly a result of a perceived aggressive attitude from Russia following the annexation of Crimea from Ukraine and its posterior intervention in eastern Ukraine both in 2014. All members of the B9 were either part of the former Soviet Union (USSR) or members of the defunct Soviet-led Warsaw Pact.

The Lublin Triangle (Lithuanian: Liublino trikampis; Polish: Trójkąt Lubelski; Ukrainian: Люблінський трикутник, Liublinskyi trykutnyk) is a regional alliance of three European countries – Lithuania, Poland, and Ukraine – for the purposes of strengthening mutual military, cultural, economic and political cooperation and supporting Ukraine's integration into the European Union and NATO. The Lublin Triangle initiative invokes the integrative heritage of the 1569 Union of Lublin.

The Three Seas Initiative (3SI or TSI), known also as the Baltic, Adriatic, Black Sea (BABS) Initiative or simply as the Three Seas (Latin: Trimarium, Polish: Trójmorze), is a forum of thirteen states, in the European Union, running along a north–south axis from the Baltic Sea to the Adriatic and Black Seas in Central and Eastern Europe. The Initiative aims to create a regional dialogue on questions affecting the member states.