Orthodox Church organization
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This article covers the organization of the Eastern Orthodox Churches rather than the doctrines, traditions, practices, or other aspects of Eastern Orthodoxy. Like the Catholic Church, the Orthodox Church claims to be the One Holy, Catholic and Apostolic Church.
The term Western Orthodoxy is sometimes used to denominate what is technically a Vicariate within the Antiochian Orthodox Church and thus a part of the Eastern Orthodox Church as that term is defined here. The term "Western Orthodox Church" is disfavored by members of that Vicariate.
In the 5th century, Oriental Orthodoxy separated from Chalcedonian Christianity (and is therefore separate from both the Eastern Orthodox and Roman Catholic churches), well before the 11th century Great Schism. It should not be confused with Eastern Orthodoxy.
Eastern Orthodoxy 
The Orthodox Church is a communion comprising the fifteen separate autocephalous hierarchical churches that recognize each other as "canonical" Orthodox Christian churches. There is an essentially political disagreement over the autocephaly of one of the churches—the Orthodox Church in America.
There is no single earthly head of all the Orthodox Churches comparable to the Pope of the Catholic Church. The highest-ranking bishop of the communion is the Patriarch of Constantinople, who is also primate of one of the autocephalous churches. These organizations are in full communion with each other, so any priest of any of those churches may lawfully minister to any member of any of them, and no member of any is excluded from any form of worship in any of the others, including reception of the Eucharist. Each local or national Orthodox Church is a portion of the Orthodox Church as a whole.
In the early Middle Ages, the One Holy Catholic and Apostolic Church was ruled by five patriarchs: the bishops of Rome, Constantinople, Alexandria, Antioch, and Jerusalem; these were collectively referred to as the Pentarchy. Each patriarch had jurisdiction over bishops in a specified geographic region. This continued until 927, when the autonomous Bulgarian Archbishopric became the first newly-promoted patriarchate to join the original five.
The patriarch of Rome was "first in place of honor" among the five patriarchs. Disagreement about the limits of his authority was one of the causes of the Great Schism, conventionally dated to the year 1054, which split the church into the Catholic Church in the West, headed by the Bishop of Rome, and the Orthodox Church, led by the four eastern patriarchs. After the schism this honorary primacy shifted to the Patriarch of Constantinople, who had previously been accorded the second-place rank at the First Council of Constantinople.
Autocephalous Orthodox churches 
Four Ancient Patriarchates 
- Ecumenical Patriarchate of Constantinople
- Greek Orthodox Church of Alexandria
- Greek Orthodox Church of Antioch
- Greek Orthodox Church of Jerusalem
Junior Patriarchates 
- Russian Orthodox Church (1448, recognized in 1589)
- Georgian Orthodox and Apostolic Church (486)
- Bulgarian Orthodox Church (870)
- Serbian Orthodox Church (1219)
- Romanian Orthodox Church (1872, recognized in 1885)
Autocephalous Archbishoprics 
- Church of Cyprus (431, recognized in 478)
- Church of Greece (1833, recognized in 1850)
- Albanian Orthodox Church (1922, recognized in 1937)
- Polish Orthodox Church (1924)
- Czech and Slovak Orthodox Church (1951)
- Orthodox Church in America (1970, autocephaly not universally recognised)
The four ancient patriarchates are most senior, followed by the five junior patriarchates. Autocephalous archbishoprics follow the patriarchates in seniority, with the Church of Cyprus being the only ancient one (AD 431). It should be noted that in the diptychs of the Russian Orthodox Church and some of its daughter churches (e.g., the Orthodox Church in America), the ranking of four of the patriarchal churches is different. Following the Russian Church in rank is Georgian, followed by Serbian, Romanian, and then Bulgarian Church. The ranking of the archbishoprics is the same.
Autonomous Orthodox churches 
- under the Ecumenical Patriarchate of Constantinople
- Finnish Orthodox Church
- Estonian Apostolic Orthodox Church* (autonomy recognized by the Ecumenical Patriarchate but not by the Russian Orthodox Church)
- Archdiocese of Russian Orthodox Churches in Western Europe*
- under the Greek Orthodox Church of Antioch
- under the Greek Orthodox Church of Jerusalem
- under the Russian Orthodox Church
- Latvian Orthodox Church
- Ukrainian Orthodox Church* (autonomy recognized by the Russian Orthodox Church but not by the Ecumenical Patriarchate)
- Moldovan Orthodox Church
- Japanese Orthodox Church* (autonomy recognized by the Russian Orthodox Church but not by the Ecumenical Patriarchate)
- Chinese Orthodox Church* (virtually non-existent, autonomy recognized by the Russian Orthodox Church but not by the Ecumenical Patriarchate)
- Russian Orthodox Church Outside Russia*
- under the Serbian Orthodox Church
- under the Romanian Orthodox Church
*Autonomy not universally recognised.
The Orthodox churches without autonomy 
- under the Ecumenical Patriarchate of Constantinople
- Greek Orthodox Archdiocese of Italy
- Exarchate of the Philippines
- American Carpatho-Russian Orthodox Diocese
- Ukrainian Orthodox Church of Canada
- Ukrainian Orthodox Church of the USA
Churches in resistance 
Due to what these churches perceive as the errors of modernism and ecumenism in mainstream Orthodoxy, they refrain from concelebration of the Divine Liturgy with them while maintaining that they remain fully within the canonical boundaries of the Church: i.e., professing Orthodox belief, retaining legitimate episcopal succession, and existing in communities with historical continuity. With the exception of the Orthodox Church of Greece (Holy Synod in Resistance), they will commune the faithful from all the canonical jurisdictions and are recognized by and in communion with the Russian Orthodox Church Outside Russia.
Due in part to the re-establishment of official ties between the Russian Orthodox Church Outside Russia and the Moscow Patriarchate, the Orthodox Church of Greece (Holy Synod in Resistance) has broken ecclesial communion with ROCOR, but the converse has not happened. Where the Old Calendar Romanian and Bulgarian churches stand on the matter is as yet unclear.
- Old Calendar Bulgarian Orthodox Church
- Orthodox Church of Greece (Holy Synod in Resistance)
- Old Calendar Romanian Orthodox Church
Churches that have voluntarily "walled themselves off" 
These Churches do not practice Communion with any other Orthodox jurisdictions nor do they tend to recognize each other. Yet, like the "Churches in Resistance" above they remain fully within the canonical boundaries of the Church: i.e., professing Orthodox belief, retaining what they believe to be legitimate episcopal succession, and existing in communities with historical continuity. Nevertheless, their relationship with all other Orthodox Churches remains unclear, as 'Orthodox' Churches normally recognize and are recognized by others.
- Old Believers
- Church of the Genuine Orthodox Christians of Greece
- Russian True Orthodox Church
- Russian Orthodox Church in America
- Ukrainian Autocephalous Orthodox Church
- Autonomous Ukrainian Orthodox Church in America
- Belarusian Autocephalous Orthodox Church
Churches that are unrecognized 
The following Churches recognize all other mainstream Orthodox Churches, but are not recognized by any of them due to various disputes:
Churches self-styled as Orthodox, unrecognized as such 
- Bulgarian Orthodox Church – Alternative synod
- Croatian Orthodox Church (1942–1945)
- Orthodox Church in Italy
- Montenegrin Orthodox Church
- Turkish Orthodox Church
- Serbian Orthodox Church official site: Помесне Православне Цркве (Autocephalous Orthodox churches)
- Orthodox Church in America official site: World Churches
- See Orthodox Church in America.
- Territorial Jurisdiction According to Orthodox Canon Law. The Phenomenon of Ethnophyletism in Recent Years, a paper read at the International Congress of Canon Law, 2001, (Ecumenical Patriarchate website)
- List of Autocephalous and Autonomous Orthodox Churches, an OrthodoxWiki article
- World Orthodox Churches, at Orthodox Church in America website
- Religious Organisations - Orthodox Churches, at WorldStatesmen.org