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- 42 Martyrs of Amorium
- 4E TV
- 666
- A History of Orthodox Missions Among the Muslims
- Abanoub
- Abba Aftse
- Abba Alef
- Abba Gerima
- Abba Guba
- Abba Inbaqom
- Abba Libanos
- Abba Liqanos
- Abba P'entelewon
- Abba Sehma
- Abba Yem'ata
- Abba Zemika'el Aregawi
- Abbess
- Abbot
- Abbot of Iona
- Abbreviations
- Abdallah Ibn Al-Fadl
- Abdel Messih El-Makari
- Abel (Poplavsky) of Lublin
- Abercius of Hierapolis
- Abgar
- Abibus of Nekressi
- Abortion
- Abouna
- Abraam of Fayoum
- Abraham of Smolensk
- Absolution Certificates
- Abu of Tbilisi
- Abundius
- Acacian Schism
- Acacius of Caesarea
- Acacius of Constantinople
- Academy
- Accessible Orthodoxy
- Acepsimus, Joseph, and Aeithalas
- Achillas of Alexandria
- Achillius of Larisa
- Acolyte
- Act of Canonical Communion with the Moscow Patriarchate
- Acts of the Apostles
- Adam (Dubets) of Przemysl
- Adam (Philippovsky)
- Adam and Eve
- Addai
- Additional/Miscellaneous Notes (Coptic Interpretations of the Fourth Ecumenical Council)
- Adelphopoiesis
- Adoptionism
- Adrian
- Adrian Fageteanu
- Adrian III of Rome
- Adrian II of Rome
- Adrian I of Rome
- Adrian and Natalia
- Adrian of Moscow
- Aer
- Aerial Toll-Houses
- Aetherius of Cherson
- Aetius of Antioch
- Afterfeast
- Aftimios Ofiesh
- Agafangel (Pashkovsky) of Odessa
- Against Heresies
- Agape Vespers
- Agapetus I of Rome
- Agapit (Gorachek) of Stuttgart
- Agapius Honcharenko
- Agatha of Palermo
- Agathangelos (Tampouratzakis) of New Smyrna
- Agathangelos of Ephesus
- Agathangelus I of Constantinople
- Agatho of Rome
- Agathodorus of Cherson
- Agathon of Alexandria
- Agathonikos (Fatouros) of Kitros
- Agathonikos (Filippotis) of Mesogaia
- Aggelis the Physician
- Agni Parthene
- Agnoetai
- Agnosticism
- Agreed Official Statements on Christology with the Catholic and Eastern Orthodox Churches
- Ahmed the Calligrapher
- Aidan of Lindisfarne
- Aimilianos (Laloussis) of Harioupolis
- Aimilianos (Vafeidis)
- Aimilianos Lazaridis of Grevena
- Ainoi
- Aisle
- Akakios (Papas) of Talantion
- Akathist
- Akedia
- Akolouthia
- Akun Island
- Alaska
- Alban
- Albanian Archdiocese (OCA)
- Albanian Orthodox Diocese of America
- Albert
- Albert J. Raboteau
- Alejo (Pacheco y Vera) of Mexico City
- Aleksander Aleksyeyev
- Aleksandr Solzhenitsyn
- Aleksei Ivanovich Musin-Pushkin
- Alexander
- Alexander (Demoglou) of Corfu
- Alexander (Du) Lifu
- Alexander (Golitzin) of Dallas, the South and the Bulgarian Diocese
- Alexander (Mileant) of Buenos Aires
- Alexander (Mogilev) of Astana
- Alexander (Mufarrij) of Ottawa
- Alexander (Nemolovsky) of Brussels
- Alexander (Okropiridze) of Guria and Samegrelo
- Alexander (Papadopoulos) of Mantineia
- Alexander (Pihach)
- Alexander (Semenoff-Tian-Chansky) of Zila
- Alexander Alexeevich Zhelobovsky
- Alexander Atty
- Alexander Dmitrievich Samarin
- Alexander Hotovitzky
- Alexander III (Tahan) of Antioch
- Alexander I of Antioch
- Alexander I of Rome
- Alexander Kukulevsky
- Alexander Men
- Alexander Nevsky
- Alexander Nevsky Lavra
- Alexander Nikolaevich Golitsyn
- Alexander Schmemann
- Alexander Schmorell
- Alexander Veronis
- Alexander Vvedensky
- Alexander Warnecke
- Alexander of Alexandria
- Alexander of Constantinople
- Alexander of Hierapolis (fifth century)
- Alexander of Hierapolis (third century)
- Alexander of Jerusalem
- Alexander of Svir
- Alexandra the Empress
- Alexandrian Rite
- Alexandros (Gianniris) of Nigeria
- Alexei Alexandrovich Shirinsky-Shikhmatov
- Alexei II (Ridiger) of Moscow
- Alexei I (Simansky) of Moscow
- Alexei Mechev
- Alexei Stepanovich Khomiakov
- Alexey Godyaew
- Alexey Mechev of Moscow
- Alexios (Leontaritis) of Carthage
- Alexios (Michalopoulos) of Trikki
- Alexios (Panagiotopoulos) of Atlanta
- Alexios (Vrionis) of Nikaia
- Alexios the Man of God
- Alexis (Kabaliuk) of Carpathia
- Alexis (Panteleyev) of Omsk
- Alexis (Trader) of Sitka
- Alexis (disambiguation)
- Alexis Dmitrievich Obolensky
- Alexis of Moscow
- Alexis of Wilkes-Barre
- Alexis van der Mensbrugghe
- Alexius I Studites of Constantinople
- Alfred the Great
- All-American Council
- All-American Sobor
- All-Diaspora Councils
- All-Merciful Saviour Monastery (Vashon Island, Washington)
- All-Night Vigil
- All-Russian Church Council of 1917-1918
- All Saints Orthodox Church (Chicago, Illinois)
- Alleluia
- Alms
- Alphabetical Collection
- Alphege
- Altar
- Alypius of Byzantium
- Alypy (Gamanovich) of Chicago
- Ambon
- Ambrose (Cantacuzène) of Geneva
- Ambrose (Jaaskelainen) of Helsinki
- Ambrose (Khelaia) the Confessor
- Ambrose (Lenis) of Kalavryta
- Ambrose (Pappa-Georgopoli) of Belaya Krinitsa
- Ambrose (Podobedov) of St. Petersburg
- Ambrose (Zographos) of Korea
- Ambrose Vretta
- Ambrose of Milan
- Ambrose of Optina
- Amen
- American Carpatho-Russian Orthodox Diocese
- American Orthodox Catholic Church
- American Orthodox Institute
- Amfilohije (Radović) of Montenegro and Litoral
- Ammon
- Amos of Jerusalem
- Amphibalus
- Amphilochios (Makris) of Patmos
- Amphilochios (Tsoukos) of New Zealand
- Amphilochius (Vakulsky) of Alaska
- Amphilochius of Pochaev
- Amvrosios (Giakalis) of Servia
- Amvrosios II (Stamenas) of Paronaxia
- Amvrossy (Merejko) of Pittsburgh
- Amvrosy II (Protasov) of Kazan
- Analogion
- Ananias of Lacedaemon
- Anaphora
- Anaphora of the Twelve Apostles
- Anastasia the Deliverer from Potions
- Anastasia the Roman
- Anastasimatarion
- Anastasios (Yannoulatos) of Albania
- Anastasius (Metkin) of Kazan
- Anastasius II of Antioch
- Anastasius II of Jerusalem
- Anastasius II of Rome
- Anastasius I of Antioch
- Anastasius I of Jerusalem
- Anastasius I of Rome
- Anastasius of Constantinople
- Anastasius of Sinai
- Anastasius of Sinai (disambiguation)
- Anastasy (Gribanovsky) of Kishinev
- Anathema
- Anatole (Kamensky) of Irkutsk
- Anatolius (Aksyonov) of Kostanai
- Anatolius II of Optina
- Anatolius I of Optina
- Anatolius of Constantinople
- Anatoly (Apostlov) of Montreal
- Anatoly (Kuznetsov) of Kerch
- Anatoly Chistousov
- Anatoly Tikhai
- Anavathmoi
- Anba Karas
- Ancient Faith Publishing
- Ancient Faith Radio
- Ancient of Days
- Andonios (Paropoulos) of Phasiane
- Andrei (Hoarște) of Cleveland
- Andrei Orlov
- Andrej (Frusic) of Banja Luka
- Andrew (Komarov) of Dnepropetrovsk
- Andrew (Moldovan) of Detroit
- Andrew (Peshko) of Krateia
- Andrew (Rymarenko) of Rockland
- Andrew (Trempelas) of Dryinoupolis
- Andrew (Vujisić)
- Andrew Kashevaroff
- Andrew Louth
- Andrew Rublev
- Andrew Stratelates
- Andrew Tregubov
- Andrew of Crete
- Andrew the Fool-for-Christ
- Andrews (Ibrahim) the Samuelite
- Andronicus of Sardis
- Andronik (Nikolsky) of Perm
- Andronik of Moscow
- Andronikov Monastery (Moscow)
- Angels
- Anglican Communion
- Angola
- Anianus of Alexandria
- Anicetus and Photius
- Anicetus of Rome
- Annunciation
- Annunciation Cathedral (Kazan Kremlin, Russia)
- Annunciation Cathedral (Kyoto, Japan)
- Annunciation Greek Orthodox Cathedral (San Francisco, California)
- Anomoeanism
- Ansgar
- Antarctica
- Ante-Nicene
- Ante-Nicene Fathers
- 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 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 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 (Scharba) of Hierapolis
- Anthony (Vadkovsky) of St. Petersburg
- 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 of Alexandria
- Anthony of Optina
- Anthony of Provat
- Anthony of the Kiev Caves
- Anthony the Great
- Anti-Orthodox
- Antichrist
- Antidoron
- Antim Ivireanul
- Antimension
- Antimos of Iberia
- Antiochene Rite
- Antiochian House of Studies
- Antiochian Orthodox Archdiocese of Australia, New Zealand and the Philippines
- Antiochian Orthodox Archdiocese of Europe
- Antiochian Orthodox Archdiocese of Santiago and All Chile
- Antiochian Orthodox Archdiocese of Toledo and Dependencies
- Antiochian Orthodox Archdiocese of the British Isles and Ireland
- Antiochian Orthodox Christian Archdiocese of North America
- Antiochian Village
- Antiochian Western Rite Vicariate
- Antiphon
- Anton Gregryevich Rubinstein
- Anton Vladimirovich Kartashev
- Antonin (Kapustin)
- Antoninus (Pokrovsky) of Alaska
- Antonio (de Rosso) of Ravenna
- Antonious (Mobayed)
- Antonius (Kompus) of Sisanion
- Antony (Scharba) of Hierapolis
- Antoun (Khouri) of Miami
- Anysia of Thessaloniki
- Anysios of Thessaloniki
- Anysius of Thessalonica