- Astronomy, Greek1
- Astronomy--Religious aspects1
- Aswānī, ʻUthmān ibn Saʻd Allāh, active 19th century. Risālat al-ikhwān1
- Atlases1
- Atoms1
- Atonement (Prayer)1
- Atonement (Prayer)--Hinduism1
- Attila, -4531
- Aubertus, de Galardone1
- Auctions1
- Augsburg Confession1
- Augustus, Emperor of Rome, 63 B.C.-14 A.D.1
- Austria--Kitzbühel1
- Authority--Religious aspects1
- Authority--Religious aspects--Islam1
- Authors, Arab1
- Authorship1
- Avicenna, 980-1037. Ishārāt wal-al-tanbīhāt1
- Avicenna, 980-1037. Ṭūr al-asrār wa-jabal fī al-ghār1
- Avraham ben Yosef Ḥasan, min Ṭaledo1