- Agreda, Dominici d'1
- Agriculture1
- Ajurrūmīyah (Ibn Ājurrūm, Muḥammad ibn Muḥammad)1
- Albigenses1
- Alchemy--Bibliography1
- Alexius, Saint1
- Alfonso V, King of Aragon, 1396-14581
- Alfīyat al-ʻIrāqī (ʻIrāqī, ʻAbd al-Raḥīm ibn al-Ḥusayn)1
- Allegories1
- Almagest (Ptolemy)1
- Almanacs1
- Amelius, Martyr1
- Amicus, Martyr1
- Amulets (Judaism)1
- Anaya, Pedro1
- Animals1
- Animals--Religious aspects--Islam1
- Anne (Mother of the Virgin Mary), Saint1
- Anthony, of Egypt, Saint, approximately 250-355 or 3561
- Anthony, of Padua, Saint, 1195-12311