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- 3628 Martyrs in Nicomedia
- 42 Martyrs of Amorium
- 4E TV
- 666
- ACROD
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- A History of Orthodox Missions Among the Muslims
- Abanoub
- Abba Aftse
- Abba Alef
- Abba Gerima
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- Abba Inbaqom
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- Abbreviations
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- Abdallah Ibn Al-Fadl
- Abdel Messih El-Makari
- Abel (Poplavsky) of Lublin
- Abel (Poplavsky) of Lublin and Kholm
- Abercius of Hierapolis
- Abercius of Hieropolis
- Abgar
- Abibus of Nekressi
- Abondius
- Abortion
- Abouna
- Abraam Bishop of Fayoum
- Abraam of Fayoum
- Abraham of Smolensk
- Abram
- Absolution Certificates
- Abu of Tbilisi
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- Abundias
- Abundius
- Abune Yesehaq
- Acacian Schism
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- Academy
- Accessible Orthodoxy
- Acepsimus, Joseph, and Aeithalas
- Acheiropoieta
- Achillas of Alexandria
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- Act of Canonical Communion with the Moscow Patriarchate
- Acts
- Acts of the Apostles
- Adalbert
- Adam
- Adam (Dubets) of Przemysl
- Adam (Dubets) of Przemysl and Novy Sandets
- Adam (Philipovsky)
- Adam (Philippovsky)
- Adam and Eve
- Addai
- Additional/Miscellaneous Notes
- Additional/Miscellaneous Notes (Coptic Interpretations of the Fourth Ecumenical Council)
- Adelphopoiesis
- Adoptianism
- Adoptionism
- Adrian
- Adrian Fageteanu
- Adrian III of Rome
- Adrian II of Rome
- Adrian I of Rome
- Adrian Rymarenko
- Adrian and Natalia
- Adrian of Moscow
- Adversus Haereses
- Aer
- Aerial Toll-Houses
- Aetherius of Cherson
- Aetius of Antioch
- Afterfeast
- Aftimios (Ofiesh) of Brooklyn
- Aftimios Ofiesh
- Agafangel (Pashkovsky)
- Agafangel (Pashkovsky) of Odessa
- Against Heresies
- Agape Vespers
- Agapetus I of Rome
- Agapit (Gorachek) of Stuttgart
- Agapit (Goratchek)
- Agapius Honcharenko
- Agatha of Palermo
- Agatha of Sicily
- Agathangel (Pashkovsky)
- Agathangel (Pashkovsky) of Odessa
- 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
- Aghathon
- Agni Parthene
- Agnoetai
- Agnosticism
- Agreed Official Statements on Christology with the Catholic and Eastern Orthodox Churches
- Agrypnia
- Ahmed the Calligrapher
- Ahmed the Deftedar
- Aidan
- Aidan of Lindisfarne
- Aimilianos (Laloussis) of Harioupolis
- Aimilianos (Vafeidis)
- Aimilianos Lazaridis of Grevena
- Ainoi
- Aisle
- Akakios (Papas) of Talantion
- Akathist
- Akathistos
- Akedia
- Akolouthia
- Akun Island
- Al-Aqsa Mosque
- Alaska
- Alban
- Albania
- Albanian Archdiocese (OCA)
- Albanian Orthodox Diocese of America
- Albert
- Albert J. Raboteau
- Albert Raboteau
- Alejo (Pacheco y Vera) of Mexico City
- Aleksander Aleksyeyev
- Aleksandr Solzhenitsyn
- Aleksei Ivanovich Musin-Pushkin
- Alexander
- Alexander (Demoglou) of Corfu
- Alexander (Demoglou) of Rodostolou
- Alexander (Du) Lifu
- Alexander (Du Lifu)
- Alexander (Golitzin)
- Alexander (Golitzin) of Dallas, the South and the Bulgarian Diocese
- Alexander (Golitzin) of Toledo
- Alexander (Mileant) of Buenos Aires
- Alexander (Mogilev) of Astana
- Alexander (Mogilev) of Astana and Almaty
- Alexander (Mufarrij) of Ottawa
- Alexander (Mufarrij) of Ottawa (Antiochian)
- Alexander (Nemolovsky)
- Alexander (Nemolovsky) of Brussels
- Alexander (Nemolovsky) of the Aleutians
- Alexander (Okropiridze) of Guria and Samegrelo
- Alexander (Papadopoulos) of Mantineia
- Alexander (Pihach)
- Alexander (Semenoff-Tian-Chansky) of Zila
- Alexander (disambiguation)
- Alexander Alexeevich Zhelobovsky
- Alexander Atty
- Alexander Dmitrievich Samarin
- Alexander Golitzin
- Alexander Hotovitsky
- Alexander Hotovitzky
- Alexander III (Tahan) of Antioch
- Alexander I of Antioch
- Alexander I of Rome
- Alexander Ivanovich Vvedensky
- Alexander Kukulevsky
- Alexander Men
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- Alexander Nikolaevich Golitsyn
- Alexander Schmemann
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- Alexander Solzhenitsyn
- Alexander Veronis
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- Alexander Warnecke
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- Alexander of Hierapolis (third century)
- Alexander of Jerusalem
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- Alexander of Svir
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- Alexandria
- Alexandrian Rite
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- Alexei (Kabalyuk) of Carpathia
- 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 (Panteleev) of Alaska
- Alexis (Panteleyev)
- Alexis (Panteleyev) of Alaska
- Alexis (Panteleyev) of Omsk
- Alexis (Toth) of Wilkes-Barre
- Alexis (Trader)
- Alexis (Trader) of Bethesda
- Alexis (Trader) of Sitka
- Alexis (disambiguation)
- Alexis Dmitrievich Obolensky
- Alexis Toth
- Alexis of Moscow
- Alexis of Wilkes-Barre
- Alexis the Man of God
- Alexis van der Mensbrugghe
- Alexius I Studites of Constantinople
- Alfred the Great
- All-American Council
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- All-Merciful Saviour Monastery (Vashon Island, Washington)
- All-Night Vigil
- All-Russian Church Council of 1917-1918
- All Night Vigil
- All Saints (Chicago)
- All Saints Orthodox Church (Chicago, Illinois)
- Alleluia
- Alms
- Almsgiver
- Almsgiving
- Alphabetical Collection
- Alphege
- Altar
- Altar table
- Alypius of Byzantium
- Alypy (Gamanovich) of Chicago
- Alypy (Gamanovich) of Cleveland
- Alypy (Gramanovich) of Chicago
- Ambo
- Ambon
- Ambrose (Cantacuzène) of Geneva
- Ambrose (Jaaskelainen) of Helsinki
- Ambrose (Jääskeläinen) of Helsinki
- Ambrose (Khelaia) the Confessor
- Ambrose (Lenis) of Kalavryta
- Ambrose (Merezhko)
- Ambrose (Pappa-Georgopoli) of Belaya Krinitsa
- Ambrose (Podobedov) of St. Petersburg
- Ambrose (Zographos) of Korea
- Ambrose Vretta
- Ambrose of Milan
- Ambrose of Optina
- Ambrose vretta
- Ambrosii of Belo-Krinitsa
- Ambrosios (Zographos) of Korea
- Ambrosios (Zographos) of Zelon
- Amen
- America
- American Carpatho-Russian Orthodox Diocese
- American Orthodox Catholic Church
- American Orthodox Institute
- Amfilohije (Radovic) of Momtenegro and Litoral
- Amfilohije (Radovic) of Montenegro and Litoral
- Amfilohije (Radović) of Montenegro and Litoral
- Ammon
- Amos of Jerusalem
- Amphibalus
- Amphilochios (Makris)
- Amphilochios (Makris) of Patmos
- Amphilochios (Tsoukos)
- Amphilochios (Tsoukos) of New Zealand
- Amphilochios Tsoukos
- Amphilochius (Vakulsky) of Alaska
- Amphilochius of Pochaev
- Amphilokhy (Vakulsky) of Alaska
- Amphiloky (Vakulsky) of Alaska
- Amvon
- Amvrosios (Giakalis) of Servia
- Amvrosios II (Stamenas) of Paronaxia
- Amvrossy (Merejko) of Pittsburgh
- Amvrosy (Podobedov) of St. Petersburg
- Amvrosy II (Protasov) of Kazan
- Anabathmoi
- Analogion
- Ananias of Lacedaemon
- Anaphora
- Anaphora of the Twelve Apostles
- Anaphora of the twelve apostles
- Anastasia of Sirmium
- Anastasia the Deliverer from Potions
- Anastasia the Great Martyr
- Anastasia the Healer
- Anastasia the Roman
- Anastasimatarion
- Anastasios (Yannoulatos) of Albania
- Anastasios (Yannoulatos) of Tirana
- Anastasios (Yannoulatos) of Tirana and All 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)
- Anastasius the Sinaite
- Anastassy (Metkin) of Kazan and Tatarstan
- Anastasy (Gribanovsky) of Kishinev
- Anathema
- Anatole (Kamensky) of Irkutsk
- Anatolius (Aksenov) of Kostanai and Petropavlovsk
- Anatolius (Aksyonov) of Kostanai
- Anatolius (Apostlov) of Montreal
- 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
- Anchorite
- Ancient Faith Publishing
- Ancient Faith Radio
- Ancient of Days
- Andonios (Paropoulos) of Phasiane
- Andrei (Hoarște)
- Andrei (Hoarște) of Cleveland
- Andrei (Komarov) of Kazan