The persecution of Eastern Orthodox Christians is the religious persecution which has been faced by the clergy and the adherents of the Eastern Orthodox Church. Eastern Orthodox Christians have been persecuted during various periods in the history of Christianity when they lived under the rule of non-Orthodox Christian political structures as well as under the rule of the Russian Orthodox Church. In modern times, anti-religious political movements and regimes in some countries have held an anti-Orthodox stance.

Catholic activities in early modern Europe

Polish–Lithuanian Commonwealth

During the end of the 16th century, under the influence of the Catholic Counter-Reformation, rising pressures towards Eastern Orthodox Christians in White Ruthenia and other Eastern parts of Polish–Lithuanian Commonwealth led to the enforcement of the Union of Brest in 1595-96. Until that time, many Lytvyns and Ruthenians who lived under the rule of Polish–Lithuanian Commonwealth were Eastern Orthodox Christians. Their hierarchs gathered in synod in the city of Brest, Belarus, Brest and composed 33 articles of Union, which were accepted by the Roman Catholic Church. Among their arguments was mentioning the efforts of former Metropolitan Isidore of Kiev who have sought unification of western and eastern churches. Also, in 1589 the Ecumenical Patriarch of Constantinople recognized the Russian Orthodox Church as legitimate. At first, the Union appeared to be successful, but soon it lost much of its initial support, mainly due to its forceful implementation on the Eastern Orthodox parishes and subsequent persecution of all who did not want to accept the Union. Enforcement of the Union stirred several massive uprisings, particularly the Khmelnytskyi Uprising of the Zaporozhian Cossacks. In 1623 Uniate Archeparch of Polotsk Josaphat Kuntsevych was murdered by a mob in Vitebsk. In 1656, Greek Orthodox Patriarch of Antioch Macarios III Zaim lamented over the atrocities committed by the Polish people, Polish Catholics against followers of Eastern Orthodoxy in various parts of Ukraine. Macarios was quoted as stating that seventeen or eighteen thousand followers of Eastern Orthodoxy were killed under hands of the Catholics, and that he desired Ottoman sovereignty over Catholic subjugation, stating:

God perpetuate the Ottoman Empire, empire of the Turks for ever and ever! For they take their impost, and enter no account of religion, be their subjects Christians or Nazarenes, Jews or Samaritians; whereas these accursed Poles were not content with taxes and tithes from the brethren of Christ...

Persecution in the Muscovite Tsardom

Persecution in the Ottoman Empire

The Ottoman Empire grouped the Eastern Orthodox Christians into the Rum Millet. In tax registries, Christianity in the Ottoman Empire, Christians were recorded as "infidels" (see ''giaour''). After the Great Turkish War (1683–99), relations between Muslims and Christians in the European provinces of the Ottoman Empire were radicalized, gradually taking more extreme forms and resulting in occasional calls of Muslim religious leaders for expulsion or extermination of local Christians, and also Jews. As a result of the Ottoman oppression, destruction of churches and violence against the non-Muslim civilian population, Serbs and their church leaders headed by Serbian Patriarch Arsenije III Čarnojević, Arsenije III sided with the Austrians in 1689, and again in 1737 under Serbian Patriarch Arsenije IV Jovanović Šakabenta, Arsenije IV, in war. In the following punitive campaigns, Ottoman forces conducted atrocities, resulting in the "Great Migrations of the Serbs". In retaliation of the Greek rebellion, Ottomans authorities orchestrated massacres of Greeks Constantinople massacre of 1821, in Constantinople in 1821. During the massacre occurred mass executions, pogrom-type attacks, destruction of churches, and looting of the properties of the city's Greek population. The events culminated with the hanging of the Ecumenical Patriarch, Patriarch Gregory V of Constantinople, Gregory V and the beheading of the Dragoman, Grand Dragoman, Konstantinos Mourousis family, Mourouzis. During the April Uprising, Bulgarian Uprising (1876) and Russo-Turkish War (1877–1878), Russo-Turkish War (1877–78), persecution of Bulgarians, Bulgarian Christian population was conducted by Turkish soldiers who massacred civilians, mainly in the regions of Panagurishte, Perushtitza, Bratzigovo, and Batak, Bulgaria, Batak (see Batak massacre). The abolition of jizya and emancipation of formerly dhimmi subjects was one of the most embittering stipulations the Ottoman Empire had to accept to end the Crimean War in 1856. Then, “for the first time since 1453, church bells were permitted to ring... in Constantinople,” writes M. J. Akbar. “Many Muslims declared it a day of mourning.” Indeed, because superior social standing was from the start one of the advantages of conversion to Islam, resentful Muslim mobs rioted and hounded Christians all over the empire. In 1860 up to 30,000 Christians were massacred in the Levant alone. Mark Twain recounts what took place in the levant: The Greek genocide which included the ''Pontic genocide'', was the systematic killing of the Eastern Orthodox Ottoman Greeks, Ottoman Greek population of Anatolia which was carried out mainly during World War I and Aftermath of World War I, its aftermath (1914–1922) on the basis of their religion and ethnicity. The genocide included massacres, forced deportations involving death marches through the Syrian Desert, rapes and burnings of Greek villages, forced conversions to Islam, expulsions, summary executions, and the destruction of Eastern Orthodox cultural, historical, and religious monuments.

Interwar period

The eastern part of Poland has a long history of Catholic–Orthodox rivalry. The Roman Catholic clergy in the Chełm region in Second Polish Republic, Poland was unambiguously anti-Orthodox in the Interwar period. Ukraine, which has been a religious borderland, has a long history of religious conflict.

World War II

Genocide of Serbs

The Croatian nationalism, Croatian and Clerical fascism, clerical fascist Ustashe established the Independent State of Croatia (NDH) four days after the German invasion of Yugoslavia. Croatia was set up as an Fascist Italy (1922–1943), Italian protectorate. Around a third of the population was Eastern Orthodox (ethnic Serbs, Serb). The Ustashe followed Nazism, Nazi ideology, forced Serbs to wear armbands with "P" for ''pravoslavac'' (a word which means: "Orthodox") on them like the Nazis forced Jews to wear armbands with a yellow Star of David on them, and implemented their goal of creating an ethnically pure Greater Croatia; Jews, Romani people, Gypsies and Serbs were all targeted for victimization by the Ustashe's genocidal policies. The Ustashe recognized Roman Catholicism and Islam as the national religions of Croatia, but it held the position that Eastern Orthodoxy, as a symbol of Serbian national identity, Serb identity, was a dangerous foe. In the spring and summer of 1941, the Genocide of Serbs in the Independent State of Croatia, genocide against Eastern Orthodox Serbs began and Concentration camps in the Independent State of Croatia, concentration camps like Jasenovac concentration camp, Jasenovac were constructed. Serbs were murdered and forcibly converted, in order to Croatization, Croatize, and permanently destroy the Serbian Orthodox Church. The Catholic leadership in Croatia mostly supported the Ustashe actions. Eastern Orthodox bishops and priests were persecuted, arrested and tortured or killed (several hundreds) and hundreds (most) of Eastern Orthodox churches were closed, destroyed, or plundered by the Ustashe. Sometimes, the entire population of a village was locked inside the local Eastern Orthodox church and the church was immediately set alight. Hundreds of thousands of Eastern Orthodox Serbs were forced to flee from Ustashe-held territories into Territory of the Military Commander in Serbia, territory of German-occupied Serbia. It was not until the end of the war that the Serbian Orthodox Church would function again in western parts of Yugoslavia. The persecution of Eastern Orthodox priests during World War II increased the popularity of the Eastern Orthodox Church in Serbia.

Contemporary

At the Eastern Orthodox conference in Istanbul on 12–15 March 1992, the church leaders issued a statement:

Former Yugoslavia

Some Serbs viewed the Catholic leadership's support for political division along ethnic and religious lines in Croatia during the Wars in Yugoslavia, and support for the Kosovo War, Albanian cause in Kosovo as anti-Serb and anti-Orthodox. Propaganda in Yugoslavia under Slobodan Milošević, Yugoslav propaganda during the Slobodan Milošević, Milošević regime portrayed Croatia and Slovenia as part of an anti-Orthodox "Catholic alliance".

Kosovo

Observers described that Orthodox Kosovo Serbs, ethnic Serbs of Kosovo have been persecuted since the 1990s. Most of the Serbian population were expelled following ethnic cleansing campaigns and many of thеm were victims of War crimes in the Kosovo War#Kosovo Albanian war crimes, massacres and captured in camps. Heritage from the Serbia in the Middle Ages, medieval Serbian state and Serbian Orthodox Church, Serbian Archbishops period, including Medieval Monuments in Kosovo, World Heritage Site, is widespread throughout Kosovo, and many of them were targeted in the aftermath of the Kosovo War, 1999 war. Karima Bennoune, United Nations special rapporteur in the field of cultural rights, referred to the many reports of widespread attacks against churches committed by the terrorist Kosovo Liberation Army (KLA). She also pointed out the fears of monks and nuns for their safety. John Clint Williamson announced EU Special Investigative Task Force's investigative findings and he indicated that a certain element of the KLA intentionally targeted minority populations with acts of persecution that also included desecration and destruction of churches and other religious sites. According to the International Center for Transitional Justice, 155 Serbian Orthodox Church, Serbian Orthodox churches and monasteries were destroyed by Kosovo Albanians between June 1999 and March 2004. World Heritage Site consisting of four Serbian Orthodox Christian churches and monasteries were inscribed on the List of World Heritage in Danger. Numerous human rights reports have consistently pointed to Anti-Serb sentiment, social antipathy towards Serbs and the Serbian Orthodox Church, as well as discrimination and abuse. In the annual International Religious Freedom Report, the United States Department of State, State Department wrote that the municipal officials continued to refuse to implement a 2016 Constitutional Court decision upholding the Supreme Court’s 2012 ruling recognizing the Visoki Dečani monastery’s ownership of land. Displaced Serbs are often barred from attending annual pilgrimage for security reasons because of protests by Kosovo Albanians in front of the Orthodox churches. The Minority Rights Group International reported that Kosovo Serbs lack physical security and consequently freedom of movement, as well as they have no possibility to practice their Christian Orthodox religion.

Russia

Russian nationalists view the United States as the centre of Western anti-Russian, anti-Slavic and anti-Orthodox 'conspiracy that aims to destroy Russia', and has used the NATO intervention in the Bosnian War (1992–95) as an argument for this.