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- Anthimos (Drakonakis) of Olympus
- Anthimos (Roussas) of Thessalonica
- Anthimus III of Constantinople
- Anthimus IV of Constantinople
- Anthimus I of Constantinople
- Anthimus VII (Tsatsos) of Constantinople
- Anthimus VI of Constantinople
- Anthimus V of Constantinople
- Anthimus of Chios
- Anthimus of Jerusalem
- Anthimus of Nicomedia
- Anthologion
- Anthony
- Anthony, John, and Eustathios
- Anthony, John, and Eustathius of Vilna
- Anthony, John, and Eustathius of Vilnius
- Anthony (Azizov) of Akhtubinsk and Enotaevka
- Anthony (Bartoshevich) of Geneva
- Anthony (Bashir) of New York
- Anthony (Bloom) of Sourozh
- Anthony (Cheremisov) of Krasnoyarsk
- Anthony (Cheremisov) of Krasnoyarsk and Yenisei
- Anthony (Cheremisov) of Oryol
- Anthony (Gergiannakis) of San Francisco
- Anthony (Grabbe) of New York
- Anthony (Khrapovitsky) of Kiev
- Anthony (Medvedev) of San Francisco
- Anthony (Michaels) of Toledo
- Anthony (Moskalenko) of Uralsk
- Anthony (Moskalenko) of Uralsk and Guryevskiy
- Anthony (Scharba) of Hierapolis
- Anthony (Vadkovsky) of St. Petersburg
- Anthony (Vadkovsky) of St. Petersburg and Ladoga
- Anthony (Woolf)
- Anthony Bashir
- Anthony Bloom
- Anthony III Studite of Constantinople
- Anthony II (Kauleas) of Constantinople
- Anthony IV of Constantinople
- Anthony I (Kassymatas) of Constantinople
- Anthony I (Zybelin) of Kazan
- Anthony M. Coniaris
- Anthony Woolf
- Anthony of Alexandria
- Anthony of Egypt
- Anthony of Optima
- Anthony of Optina
- Anthony of Provat
- Anthony of Vilna
- Anthony of the Caves
- Anthony of the Kiev Caves
- Anthony the Great
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- Antichrist
- Antidoron
- Antim Ivireanul
- Antimens
- Antimension
- Antimins
- Antimos of Iberia
- Antioch
- Antiochene Rite
- Antiochian House of Studies
- Antiochian Orthodox Archdiocese of Australia, New Zealand, and All Oceania
- Antiochian Orthodox Archdiocese of Australia, New Zealand and the Philippines
- Antiochian Orthodox Archdiocese of Australia and New Zealand
- Antiochian Orthodox Archdiocese of Europe
- Antiochian Orthodox Archdiocese of Santiago and All Chile
- Antiochian Orthodox Archdiocese of Toledo and Dependencies
- Antiochian Orthodox Archdiocese of Western and Central Europe
- Antiochian Orthodox Archdiocese of the British Isles and Ireland
- Antiochian Orthodox Christian Archdiocese of Australia
- Antiochian Orthodox Christian Archdiocese of Australia, New Zealand and the Philippines
- Antiochian Orthodox Christian Archdiocese of Australia and New Zealand
- Antiochian Orthodox Christian Archdiocese of North America
- Antiochian Orthodox Deanery of the United Kingdom and Ireland
- Antiochian Village
- Antiochian Western Rite Vicariate
- Antiphon
- Antiphonal
- Antiphons
- Anton Gregryevich Rubinstein
- Anton Vladimirovich Kartashev
- Antonin (Kapustin)
- Antoninus (Pokrovsky) of Alaska
- Antonio (de Rosso) of Ravenna
- Antonio De Rosso
- Antonious (Mobayed)
- Antonius (Kompus) of Sisanion
- Antony (Bashir) of New York
- Antony (Scharba) of Hierapolis
- Antony Bashir
- Antony II Kauleas of Constantinople
- Antony IV of Constantinople
- Antony I Kassymatas of Constantinople
- Antoun (Khouri) of Miami
- Anysia of Thessaloniki
- Anysios of Thessaloniki
- Anysius of Thessalonica
- Aphthartodocetism
- Apocalypse of Pseudo-Methodius
- Apocatastasis
- Apocrypha
- Apodosis
- Apokatastasis
- Apollinarianism
- Apollinaris of Hierapolis
- Apollinaris of Ravenna
- Apollinarism
- Apollinary (Koshevoy) of San Francisco
- Apollonius of Alexandria
- Apollos Ivanovich Naumov
- Apologetics
- Apologist
- Apologists
- Apology
- Apolytikion
- Apophatic theology
- Apostasy
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- Aposticha
- Apostle
- Apostle Achaicus
- Apostle Agabus
- Apostle Alphaeus
- Apostle Amplias
- Apostle Ananias
- Apostle Andrew
- Apostle Andronicus
- Apostle Apelles
- Apostle Apollo
- Apostle Apphia
- Apostle Aquila
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- Apostle Aristarchus
- Apostle Aristobulus
- Apostle Artemas
- Apostle Asyncritus
- Apostle Barnabas
- Apostle Bartholomew
- Apostle Caesar
- Apostle Carpus
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- Apostle Cleopas
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- Apostle Crispus
- Apostle Epaphroditus
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- Apostle Erastus
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- Apostle Fortunatus
- Apostle Gaius
- Apostle Hermas
- Apostle Hermes
- Apostle Hermes (bishop)
- Apostle Herodian
- Apostle James
- Apostle James (son of Alphaeus)
- Apostle James (son of Zebedee)
- Apostle James the Just
- Apostle Jason
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- Apostle Philip (of the Seventy)
- Apostle Philip (of the Twelve)
- Apostle Philologos
- Apostle Phlegon
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- Apostle Silas
- Apostle Silvan
- Apostle Simon
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- Apostle Stachys
- Apostle Stephen the Protomartyr
- Apostle Symeon
- Apostle Tertius
- Apostle Thaddeus
- Apostle Thomas
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- Apostles
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- Apostolos II (Dimelis) of Rhodes
- Apostolos Makrakis
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- Archdiocese of Caesarea
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- Archdiocese of Caesarea in Anatolia
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- Archdiocese of Canada (OCA)
- Archdiocese of Carthage
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- Archdiocese of Constantinople
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- Archdiocese of Great Britain
- Archdiocese of Guinea
- Archdiocese of Heliopolis
- Archdiocese of Hermopolis
- Archdiocese of Irinopolis
- Archdiocese of Irinoupolis
- Archdiocese of Italy and Malta
- Archdiocese of Johannesburg
- Archdiocese of Johannesburg and Pretoria
- Archdiocese of Kampala
- Archdiocese of Kampala and All Uganda
- Archdiocese of Kananga
- Archdiocese of Katanga
- Archdiocese of Kenya
- Archdiocese of Khartoum and All Sudan
- Archdiocese of Kinshasa
- Archdiocese of Leontopolis
- Archdiocese of Madagascar
- Archdiocese of Memphis
- Archdiocese of Mwanza
- Archdiocese of Nairobi
- Archdiocese of Naucratis
- Archdiocese of Nigeria
- Archdiocese of Nubia
- Archdiocese of Nubia and All Sudan
- Archdiocese of Ohrid
- Archdiocese of Pelusium
- Archdiocese of Pilousion
- Archdiocese of Ptolemais
- Archdiocese of Tripoli
- Archdiocese of Tripoli and Al-koura
- Archdiocese of Tripolis
- Archdiocese of Zambia
- Archdiocese of Zambia and Malawi
- Archdiocese of Zimbabwe
- Archdiocese of Zimbabwe and Angola
- Archdiocese of the Cape of Good Hope
- Archieratikon
- Archimandrite
- Archimandrite Aimilianos
- Archimandrite Sophrony