- Abbazia di Santo Stefano (Pistoia, Italy)1
- Abbeys1
- Abridgments5
- Abu Natser Shemuʹel, ha-Leṿi1
- Abu ʻAmar Seʹadyah, ha-Leṿi1
- Abū Bakr, Caliph, -6341
- Abū al-Saʻūd Muḥammad ibn Muḥammad, 1492 or 1493-1574 or 1575. Fatāwá1
- Acciaioli, Antonio1
- Acciaioli, Francesco1
- Account books6
- Accounting34
- Actions and defenses (Islamic law)1
- Administration3
- Administration of estates1
- Adrian VI, Pope, 1459-15231
- Afghanistan1
- Afghanistan--Herat2
- Agazaria, Claudio Boncompagni di1
- Agreda, Dominici d'1
- Agriculture1