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- Anysia of Thessaloniki
- Anysios of Thessaloniki
- Anysius of Thessalonica
- Aphthartodocetism
- Apocalypse of Pseudo-Methodius
- Apocatastasis
- Apocrypha
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- Apollinaris of Hierapolis
- Apollinaris of Ravenna
- Apollinary (Koshevoy) of San Francisco
- Apollonius of Alexandria
- Apollos Ivanovich Naumov
- Apologetics
- Apologist
- Apophatic theology
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- Apostle Alphaeus
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- Atrium
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