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- Andrew of Constantinople
- Andrew of Crete
- Andrew the Fool-for-Christ
- Andrews (Ibrahim) the Samuelite
- Andriy (Peshko) of Krateia
- Andronicus of Sardis
- Andronik (Nikolsky) of Perm
- Andronik of Moscow
- Andronik of Perm
- Andronikov Monastery (Moscow)
- Angel
- Angels
- Anglican Communion
- Angola
- Anianus of Alexandria
- Anicetus and Photius
- Anicetus of Rome
- Anna
- Annunciation
- AnnunciationCathedralSF
- Annunciation Cathedral (Kazan Kremlin, Russia)
- Annunciation Cathedral (Kyoto, Japan)
- Annunciation Cathedral of Kazan Kremlin
- Annunciation Greek Orthodox Cathedral (San Francisco, California)
- Annunciation to the Theotokos
- Anomoeanism
- Ansgar
- Antarctica
- Ante-Nicene
- Ante-Nicene Fathers
- Anthimos (Dionysios) Roussas of Thessalonica
- Anthimos (Drakonakis) of Christoupolis
- 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