- Aldobrandini, Giovanni degli1
- Alessandri, Alessandro degli1
- Alessandri, Niccolò degli1
- Alessandro, Pietro di1
- Alfonso V, King of Aragon, 1396-14581
- Allegories1
- Alliata family1
- Almanach perpetuum celestium motuum (Zacuto, Abraham ben Samuel)1
- Alphabet books1
- Altoviti, Bartolomea1
- Alum tawed bindings1
- Amadori, Bartolomeo1
- Amadori, Niccolo1
- Ambrogio, Leonardo d'1
- Amedei, Bartolomeo1
- Amideo, Chele d'1
- Amthilah al-mukhtalifah1
- Amulets (Judaism)1
- Amīr al-Kabīr, Muḥammad ibn Muḥammad, 1742-1817. Majmūʻ fī al-fiqh1
- An authorization to perform a ritual slaughter according to the Jewish law by Avraham Mosheh Leʼon of Carpentras to his son Daniʼel, written on 25 of Tamuz 17641