- Abū Yūsuf Yaʻqūb, 731 or 732-7981
- Abū al-Layth al-Samarqandī, Naṣr ibn Muḥammad, -983? Muqaddimah1
- Abū al-Layth al-Samarqandī, Naṣr ibn Muḥammad, -983? Muqaddimah fī al-ṣalāh1
- Achilles (Mythological character)1
- Acquisition of manuscripts1
- Acrostics1
- Advent sermons1
- Aeneas (Legendary character)1
- Affinity (Law)1
- Afghanistan1
- Afghanistan--Herat1
- Agnes, Saint, Martyr1
- Agriculture--Accounting1
- Al-Munajjim al-Kashi, Yahya ibn Imad bin Yahya1
- Alchemy--Bibliography1
- Alexius, Saint1
- Alfonso V, King of Aragon, 1396-14581
- Alimony (Islamic law)1
- Allegories1
- Almagest (Ptolemy)1