- Astronomy--Mathematics2
- Astronomy--Religious aspects1
- Astronomy--Religious aspects--Jainism1
- Astronomy--Tables3
- Aswānī, ʻUthmān ibn Saʻd Allāh, active 19th century. Risālat al-ikhwān1
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah3
- Atlantic Ocean--English Channel1
- Atlases6
- Atlases (Geographic)19
- 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