- Astronomy, Arab--Tables3
- Astronomy, Greek1
- Astronomy, Medieval6
- Astronomy--Tables1
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah2
- Atonement (Hinduism)6
- Attila, -4531
- Augsburg Confession1
- Augustine, of Hippo, Saint, 354-4305
- Augustinians3
- Aurispa, Giovanni, approximately 1376-14591
- Austria2
- Austria--Kitzbühel1
- Authors, Arab1
- Authors, Arab--Biography1
- Autographs75
- Autographs (Provenance)64
- Avatars (Religion)1
- Aveiro, Gabriel de Lencastre, Duque de, 1667-17451
- Avicenna, 980-1037. Qaṣīdah al-rūḥīyah1