- Abbaye aux Dames (Caen, France)1
- Abbazia di S. Maria di Porcilia (Padua, Italy)1
- Abbazia di Santo Stefano (Pistoia, Italy)1
- Abbots--Appointment, call, and election1
- Abraham (Biblical patriarch)1
- Absolution1
- Acciaioli, Antonio1
- Acciaioli, Francesco1
- Account books1
- Accounts1
- Addresses1
- Aegidius, Saint, Abbot1
- Affinity (Law)1
- Agamemnon, King of Mycenae (Mythological character)1
- Agazaria, Claudio Boncompagni di1
- Agreda, Dominici d'1
- Agriculture1
- Albertus de Fontanella1
- Albizzi, Costanza1
- Alchemy--Manuscripts1