The Orthodox Slavs form a religious grouping of the Slavic peoples, including ethnic groups and nations that predominantly adhere to the Eastern Orthodox Christian faith and whose Churches follow the Byzantine Rite liturgy. Orthodoxy spread from the Balkans to Eastern Europe in the Early Middle Ages through Byzantine influence, and has been retained in several countries until today.
Orthodox Slavonic nations today include the Belarusians, Bulgarians, Macedonians, Montenegrins, Russians, Serbs and Ukrainians. They inhabit a contiguous area in Eastern Europe stretching from the northeast in the Baltic Sea to the Carpathian and Balkan Mountains in the southeast and southwest; from the north in the Russian Federation to the southwest in Macedonia near the Greek border. There are also major Orthodox Slavic population hubs and communities in North Asia (predominantly Siberia), the Americas (predominantly North America), and significant diaspora groups throughout the rest of the world.
All Orthodox Christian Churches with Slavic-language liturgy, with the exception of the Bulgarian Church, use the Julian calendar ("Old Style") exclusively, and all use it to calculate the date Easter is celebrated.
Slavic states with Orthodox majority or plurality:
|Serbia||84.59% (2011 census)|
|Ukraine||72% (2008 est.)|
|Montenegro||70.07% (2011 census)|
|Macedonia||64.78% (2002 census)|
|Bulgaria||59.4% (2011 census)|
|Belarus||48.3% (2011 census)|
|Russia||41% (2012 census)|
Other Slavic-majority states with notable Orthodox minorities include Bosnia and Herzegovina (30.75%, 2013 census) and Croatia (4.44%, 2011 census). Small numbers are found in West Slavic countries such as Slovakia (0.9%, 2011), Poland (0.7%, 2011), and the Czech Republic. Among non-Slavic majority states with notable Orthodox Slavic communities are
|Church||Year autocephaly granted||Number of followers|
|Bulgarian Orthodox Church||870||8–10 million|
|Serbian Orthodox Church||1219||8–12 million|
|Russian Orthodox Church||1589||150 million|
|Polish Orthodox Church||1924||600,000|
|Czech and Slovak Orthodox Church||1998||100,000|
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