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- August 9
- Augustine (Markevitch) of Lviv
- Augustine (Markevitch) of Lviv and Galicia
- Augustine Kantiotis
- Augustine of Canterbury
- Augustine of Hippo
- Augustinos (Kantiotes) of Florina
- Aurel Jivi
- Aurelius of Carthage
- Australia
- Australian Byzantine Choir
- Australian jurisdictions without a local bishop
- Australian monasteries (list)
- Autocephalic Greek Orthodox Church of America and Australia
- Autocephalous
- Autocephalous Greek Orthodox Church of America and Australia
- Autocephalous Greek Orthodox Metropolis of America and Canada
- Autocephaly
- Automelon
- Autonomous
- Autonomous Archdiocese of Ohrid
- Autonomous Metropolia of Milan and Western Europe
- Autonomous Orthodox Church of Milan, Western Europe and Canada
- Autonomous Orthodox Church of Milan of and Western Europe and Canada
- Autonomous Orthodox Metropolia of North and South America and the British Isles
- Autonomous Orthodox Metropolia of the Americas and the British Isles
- Autonomous Orthodox Metropolia of the North and South America and the British Isles
- Autonomy
- Auxentios (Pastras) of Athens and All Greece (T.O.C.)
- Auxiliary bishop
- Averky (Taushev) of Syracuse
- Avitus
- Avvakum
- Aximus of Alexandria
- Axios
- Azymes
- Babylas of Antioch
- Balamand Agreement
- Balamand Orthodox Theological Seminary (Tripoli, Lebanon)
- Balamand Statement
- Baptism
- Baptism-Chrismation Service
- Baptism of Rus'
- Baptismal names
- Baptistry
- Baptistry of John (Patmos)
- Baptists
- Baptize
- Barbara (Trofimova) of Piukhtitsa
- Barbara (Trofimova) of Piukhtitsa Convent
- Barbara of Heliopolis
- Barbara of Nicomedia
- Barlaam of Calabria
- Barlaam of Moscow
- Barlaam of the Kiev Caves
- Barnabas (Nastić) of Hvosno
- Barnabas (Prokofiev)
- Barnabas (Safronov) of Pavlodar
- Barnabas (Safronov) of Pavlodar and Ust-Kamenogorsk
- Barnabas (Tyris) of Neapolis
- Barnabas of Trimithounta
- Barsanuphius of Optina
- Barsoum El-Erian
- Bartholomeos (Katsouris) of Megara
- Bartholomew I
- Bartholomew I (Archontonis) of Constantinople
- Barthoromeos (Katsouris) of Megara
- Baselios Didymos I
- Basil
- Basil (Blatsos) of Caesarea
- Basil (Doroszkiewicz) of Poland
- Basil (Doroszkiewicz) of Warsaw
- Basil (Essey) of Wichita
- Basil (Fedak) of Winnipeg
- Basil (Kodseie)
- Basil (Miceli) of Ostia
- Basil (Osborne) of Amphipolis
- Basil (Osborne) of Sergievo
- Basil (Papachristou) of Dryinoupolis
- Basil (Rodzianko) of San Francisco
- Basil (Shuan) of Beijing
- Basil (Shuang) of Beijing
- Basil (disambiguation)
- Basil III (Georgiadis) of Constantinople
- Basil Kalika of Novgorod
- Basil Osborne
- Basil and Theodore
- Basil of Ancyra
- Basil of Beth Man'em
- Basil of Cherson
- Basil of Jerusalem
- Basil of Ostrog
- Basil the Blessed
- Basil the Confessor
- Basil the Elder
- Basil the Great
- Basileios of Smyrna
- Basilica
- Basilica Monument of St. Isidore (Chios)
- Basilio (Grillo Miceli) of Ravenna and L'Aquila
- Basilios (Kodseie)
- Basilios (Kodseie) of Australia
- Basilios (Kodseie) of Australia, New Zealand and the Philippines
- Basilissa of Nicomedia
- Bassa of Edessa
- Bassian of Kazan
- Battle of Milvian Bridge
- Beatitudes
- Beautitudes
- Bede
- Beheading of St. John the Forerunner
- Belarusian Autocephalous Orthodox Church
- Belarusian Council of Orthodox Churches in North America
- Bells
- Belogorsky St. Nicholas Orthodox Missionary Monastery Cathedral (Perm Krai, Russia)
- Bema
- Ben Lomond Crisis
- Benedict (Papadopoulos) of Jerusalem
- Benedict (Plotnikov) of Kazan
- Benedict (Tsekouras) of Philadelphia
- Benedict (disambiguation)
- Benedict III of Rome
- Benedict IX of Rome
- Benedict VIII of Rome
- Benedict VI of Rome
- Benedict XVI
- Benedict of Jerusalem
- Benedict of Nursia
- Bengt Pohjanen
- Benjamin
- Benjamin (Basalyga)
- Benjamin (Basalyga) of Pittsburgh
- Benjamin (Fedchenkov) of Saratov
- Benjamin (Fedchenkov) of the Aleutians
- Benjamin (Kazansky) of Petrograd
- Benjamin (Kazansky) of Petrograd and Gdovsk
- Benjamin (Peterson) of San Francisco
- Benjamin (Putsek-Grigorovich) of Kazan
- Benjamin I
- Benjamin I of Constantinople
- Berhtwald
- Beuno the Wonderworker
- Bible
- Biblical Odes
- Biblical canon
- Bibliography of Orthodoxy in America
- Birinus of Dorchester
- Birnstan of Winchester
- Birth Control and Contraception
- Bishop
- Bishop Akakios of Talantion
- Bishop Germanos of Patra
- Bishop Vassilij of Ostia
- Bishop of San Francisco
- Bishops
- Bishops of the Diocese of Kazan
- Bishops of the Russian Metropolia in North America
- Bishops of the Russian church in North America
- Bishoy
- Bishoy (Nicola) of Damietta
- Bishoy Kamel
- Blaise of Sebaste
- Blessed Virgin Mary
- Blessing of homes
- Blood
- Blood in the Bible
- Body of Christ
- Bogomilism
- Boniface
- Book of Acts
- Book of Enoch
- Book of Genesis
- Book of Joshua
- Book of Judges
- Book of Kells
- Book of Nahum
- Book of Nehemiah
- Book of Numbers
- Book of Philemon
- Book of Revelation
- Book of Ruth
- Book of the Bee
- Booksellers
- Boris (Geeza) of Chicago
- Boris Bobrinskoy
- Boris I of Bulgaria
- Boris T. Pash
- Boris and Gleb
- Bosa of York
- Botswana
- Brahmavar (Goan) Orthodox Church
- Branch theory
- Bread and Salt
- Bregowine
- Brendan the Navigator
- Brendan the Voyager
- Brianchaninov
- Bride of Christ
- Bridegroom
- Brief dictionary of orthodox terms
- Bright Week
- Brigid of Kildaire
- Brigid of Kildare
- British Orthodox Church
- British Orthodox Church (Coptic)
- Broken/ow:FAQ
- Broken/ow:MCB
- Broken/ow:MOS
- Broken/ow:NPOV
- Broken/ow:POV
- Broken/ow:SM
- Brotherhood of St. Moses the Black
- Brotherhood of St. Photios
- Brotherhood of St. Photius
- Brotherhood of St. Symeon the New Theologian
- Brotherhood of Theologians Zoe
- Brotherhood of saint moses the black
- Brotherhood of st moses the black
- Brotherhoods
- Bryanchaninov
- Brychan of Brecknock
- Brynach
- Bulgaria
- Bulgarian Alternative Synod
- Bulgarian Diocese (OCA)
- Bulgarian Diocese in Exile
- Bulgarian Eastern Orthodox Diocese of the USA, Canada and Australia
- Bulgarian Orthodox Church
- Bulgarian Orthodox Diocese of Western and Central Europe
- Bulgarian saints
- Burazeri (Athos)
- Bureaucrat
- Burning Bush
- Butterweek
- Byzantine
- Byzantine Calendar
- Byzantine Catholic
- Byzantine Chant
- Byzantine Choir David the Psalmist
- Byzantine Commonwealth
- Byzantine Creation Era
- Byzantine Date of Creation
- Byzantine Ecclesiastical Choir "Saint John of Damascus"
- Byzantine Ecclesiastical Choir "St. John of Damascus"
- Byzantine Emperor
- Byzantine Empire
- Byzantine Music
- Byzantine Notation
- Byzantine Revival Architecture
- Byzantine Rite
- Byzantine Studies
- Byzantine chant
- Byzantine music
- Byzantine response to OCA autocephaly
- Byzantium
- C. S. Lewis
- Caedmon
- Caesarea
- Caesarea in Cappadocia
- Caesarius of Arles
- Caesaropapism
- Cain and Abel
- Caintigern of Loch Lomond
- Calendar
- Callinicos (Demenopoulos) of Paronaxia
- Callinicus (Kyparissis) of Alexandria
- Callinicus III of Constantinople
- Callinicus IV of Constantinople
- Callinicus I of Constantinople
- Callistratus (Tsintsadze) of Georgia
- Callistus I of Constantinople
- Callistus I of Rome
- Cameroon
- Camp Nazareth
- Candida
- Candle
- Candlemas
- Canon
- Canon (disambiguation)
- Canon (hymn)
- Canon (mass)
- Canon Law
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- Canonarch
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- Canonical release
- Canonical territory
- Canonization
- Canons
- Canons (law)
- Canons of the Orthodox Church
- Cantor
- Capital punishment
- Capiton of Cherson
- Cappadocian Fathers
- Cappadocians
- Care for the poor
- Cassock
- Catacombs
- Cataphatic theology
- Catechesis
- Catechetical School of Alexandria
- Catechism
- Catechisms in English
- Catechist
- Catechumen
- Catechumenate
- Cathach of St. Columba
- Cathedra
- Cathedral
- Cathedral Church of St George (Istanbul)
- Cathedral of Alexander Nevsky (Warsaw)
- Cathedral of Archangel MIchael (Moscow Kremlin)
- Cathedral of Archangel Michael (Moscow Kremlin)
- Cathedral of Christ the Saviour (Moscow)
- Cathedral of Mary Magdalen Equal to the Apostles (Warsaw)
- Cathedral of St. John the Baptist (Washington, D.C.)
- Cathedral of St. Michael the Archangel (Sitka, Alaska)
- Cathedral of St. Prince Vladimir Equal to the Apostles (St. Petersburg)
- Cathedral of the Annunciation (Moscow Kremlin)
- Cathedral of the Holy New-Martyrs and Confessors of Russia (Munich, Bavaria)
- Cathedral of the Theophany in Elokhovo (Moscow)
- Cathedral of the Transfiguration of Our Lord (New York, New York)
- Catherine of Alexandria
- Catholicism
- Catholicos
- Catholicosate of Cilicia
- Cave of the Apocalypse
- Cedd
- Cedd of Lastingham
- Celestine of Rome
- Celibacy
- Cell
- Cenobitic
- Cenobium of the Annunciation (Ormylia, Chalkidiki)
- Cenobium of the Annunciation (Ormylia, Chalkidiki, Greece)
- Censer
- Cetinje monastery
- Chad of Lichfield
- Chad of Mercia
- Chairetismoi
- Chalcedon
- Chalcedon (An Analysis)
- Chalcedonian Creed