Encyclopedias, Almanacs, Transcripts, and Maps
- Adso of Montier-en-Der
- Aduarte, Diego Francisco
- Adulam Region
- Adultery (in the Bible)
- Adventist Family
- Adventist Family: Intrafaith Organizations
- Advertence
- Advertisements, Book of
- Aelfric Grammaticus
- Aelfric of Canterbury, St.
- Aelfryth of Crowland, St.
- Aelian°
- Aelred (Ailred), St.
- Aemilian, Ss.
- Aeon (in the Bible)
- Aeonius of Arles, St.
- Aeronautics, Aviation, and Astronautics
- Aertnys, Jozef
- Aescoly (Weintraub), Aaron Zeʾev
- Aesculapius, Cult of