- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah8
- Atlantic Ocean--English Channel1
- Atlases7
- Atlases (Geographic)19
- Atoms1
- Atonement1
- Atonement (Hinduism)13
- Atonement (Prayer)1
- Atonement (Prayer)--Hinduism1
- Attila, -4531
- Auctions1
- Audiore, Antonio1
- Augsburg Confession1
- Augustine, of Hippo, Saint, 354-4309
- Augustinians5
- Aurangzeb, Emperor of Hindustan, 1618-17071
- Aurispa, Giovanni, approximately 1376-14591
- Austria28
- Austria--Lambach (Upper Austria)1
- Austria--Vienna1