million, Byzantine Rite Eastern Orthodoxy – 220 million The best estimate of the number of Eastern Orthodox Christians is 220 million or 80% of all Orthodox Christians worldwide. Its main body consists of the various autocephalous churches along with the autonomous and other churches canonically linked to them, for the most part form a single communion, making the Eastern Orthodox Church the second largest single denomination behind the Catholic Church. In addition, there are several Eastern Orthodox splinter groups and non-universally recognized churches. Autocephalous churches – 168 million Russian Orthodox Church – 100 million Romanian Orthodox Church – 17–18.8 million Church of Greece – 10 million Serbian Orthodox Church – 8-12 million Bulgarian Orthodox Church – 8-10 million Ecumenical Patriarchate of Constantinople – 5.25 million Greek Orthodox Church of Antioch – 4.3 million Georgian Orthodox Church – 3.5 million Macedonian Orthodox Church – 2 million Church of Cyprus – 0.7 million Polish Orthodox Church – 0.6 million Greek Orthodox Church of Alexandria – 0.5 million Albanian Orthodox Church – 0.4 million Greek Orthodox Church of Jerusalem – 0.4 million Czech and Slovak Orthodox Church – 0.075 million Autonomous churches – 13 million Ukrainian Orthodox Church (Moscow Patriarchate) – 7.2 million Metropolitan Church of Chișinău and All Moldova (Moscow Patriarchate) – 3.2 million Russian Orthodox Church Outside Russia – 0.4 million Metropolitan Church of Bessarabia (Moldova) (Romanian Patriarchate) – 0.72 million Orthodox Ohrid Archbishopric (North Macedonia) – 0.34 million Estonian Orthodox Church (Moscow Patriarchate) – 0.3 million Finnish Orthodox Church (Ecumenical Patriarchate) – 0.06 million Chinese Orthodox Church (Moscow Patriarchate) – 0.03 million Japanese Orthodox Church (Moscow Patriarchate) – 0.03 million Latvian Orthodox Church (Moscow Patriarchate) – 0.02 million Estonian Orthodox Church (Ecumenical Patriarchate) – 0.02 million Churches in communion with the above Orthodox Churches but with disputed autocephaly – 19 million Orthodox Church of Ukraine – 12–18 million Orthodox Church in America – 1 million Non-universally recognized churches – 3.82 million Belarusian Autocephalous Orthodox Church – 2.4 million Orthodox Church of Greece (Holy Synod in Resistance) – 0.75 million Old Calendar Bulgarian Orthodox Church – 0.45 million Orthodox Church in Italy – 0.12 million Old Calendarist Romanian Orthodox Church – 0.05 million Montenegrin Orthodox Church – 0.05 million Other separated Orthodox groups – 6 million Old Believers – 5.5 million Greek Old Calendarists – 0.86 million True Orthodox Church – 0.85 million Evangelical Orthodox Church – 0.07 million Autocephalous Turkish