A
- Abraham the Great of Kashkar
- Abuna
- Albanian Greek-Catholic Church
- Albanian Orthodox Church
- Alexandrian Rite
- Ancient Church of the East
- Antiochene Rite
- Antiochian Orthodox Christian Archdiocese of North America
- Antiochian Orthodox Church
- Archimandrite
- Armenian Apostolic Church
- Armenian Catholic Church
- Armenian Catholic Patriarchs
- Assyrian Church of the East
- Assyrian Evangelical Church
- Athenagoras (Patriarch)
- Autocephaly
- Avvakum
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