Eastern Europe refers broadly to the eastern portion of the European continent and to a set of countries that share certain historical, cultural and political features. The term has been used in different ways over time: as a geographic label, as an administrative or statistical category, and as a cultural-historical distinction within Europe. Its boundaries are not fixed; scholars and organizations use different criteria, including religion, political alignment and geography. Early uses emphasized the religious influence of the Eastern Orthodox Church centered on Constantinople (now Istanbul) as a dividing line between eastern and western Christian traditions.
The contrast with western Europe became stronger after the Great Schism and through the medieval period, when allegiance to the Roman Catholic or later Protestant churches often marked western identity. In the 20th century, the Cold War era redefined Eastern Europe in geopolitical terms: countries allied with the Soviet bloc during the Cold War were commonly labeled eastern because they were politically aligned with the Soviet Union. The post‑Cold War period has complicated the picture further: some states joined Western institutions while others became independent from Soviet control. The term also overlaps with regions that are distinct for ethnic or social reasons, for example the presence of the Roma population in many countries, and the special cases of the Baltic states and countries of the Caucasus such as Georgia, Armenia and Azerbaijan.
Contemporary institutions and statistical agencies offer working definitions to support analysis and policy. For example, the United Nations Statistics Division and the EU multilingual thesaurus EuroVoc provide lists used in international reporting. Historical groupings such as the Warsaw Pact remain relevant in discussions of Cold War history, while modern debates focus on economic transition, EU and NATO enlargement, migration, and regional cooperation.
Countries commonly included
Albania — Southeastern Europe, modern state with Ottoman and Balkan heritage.
Belarus — East-central Europe with close historical ties to Russia.
Bosnia and Herzegovina — a multiethnic Balkan country shaped by Ottoman and Austro-Hungarian rule.
Bulgaria — a Slavic-speaking state on the Black Sea with Orthodox traditions.
Croatia — Adriatic nation that historically had western European ties in the Middle Ages.
Cyprus — an island at the crossroads of Europe and Asia with complex political status.
Czech Republic — Central European state with historical connections to western Europe.
Estonia — a Baltic state with strong Nordic and European links.
Georgia — a Caucasus country often considered at the frontier of Europe and Asia.
Greece — southeastern European nation with ancient cultural influence across Europe.
Hungary — a Central European country with a distinct language and mixed historical orientation.
Kazakhstan — a transcontinental state with territory in both Europe and Asia.
Latvia — another Baltic country with a strong European integration trajectory.
Lithuania — historic Grand Duchy with deep ties to Central and Northern Europe.
North Macedonia — a Balkan state whose modern identity emerged from Yugoslavia's breakup.
Moldova — an eastern European country between Romania and Ukraine with Moldovan and Romanian links.
Montenegro — a small Adriatic republic with a recent history of independence.
Poland — a major Central European state with shifting historical boundaries.
Romania — a Black Sea country with Latin-language roots amid Slavic neighbors.
Russia — a transcontinental state spanning Eastern Europe and northern Asia.
Serbia — a central Balkan country with a complex modern history.
Slovakia — a Central European state formed after the peaceful dissolution of Czechoslovakia.
Slovenia — a Central European country that historically leaned west in the medieval era.
Turkey — a transcontinental nation with land in Europe and Asia and a long regional role.
Ukraine — a large eastern European state with significant historical and geopolitical importance.
Eastern Europe is linguistically, religiously and culturally diverse. While many countries have Slavic languages and Orthodox Christian traditions, others use Romance, Uralic or Turkic languages and have Catholic, Protestant or Muslim communities. Economic development varies from high-income EU members to lower-income states undergoing transition. Contemporary interest in the region often centers on energy transit routes, security and the balance between integration with Western institutions and historical ties to Russia and Asia. For more detailed profiles of individual countries and international classifications, follow institutional resources and national statistical offices via the links above.
