- Anthony, of Egypt, Saint, approximately 250-355 or 3561
- Anthony, of Padua, Saint, 1195-12311
- Anthropomorphic letters1
- Antiphonaries (Service books)1
- Antiquities1
- Aristotle1
- Armorial bindings1
- Astronomy, Ancient1
- Astronomy, Medieval1
- Augustine, of Hippo, Saint, 354-4301
- Augustus, Emperor of Rome, 63 B.C.-14 A.D.1
- Aveiro, Gabriel de Lencastre, Duque de, 1667-17451
- Azar, Menaḥem ben Natan1
- Battle of Agincourt (Agincourt, France : 1415)1
- Battle of Pharsalus (Farsala, Greece : 48 B.C.)1
- Beards1
- Belgium1
- Benedictine nuns1
- Benelux countries1
- Bestiaries1