- Agnihotra (Hindu rite)11
- Agniṣṭoma (Hindu rite)3
- Agreda, Dominici d'1
- Agriculture3
- Agriculture--Economic aspects2
- Agriculture--Religious aspects--Hinduism2
- Alban, Saint, -304?1
- Alberto, Alberto di2
- Albertus de Fontanella1
- Albigenses1
- Albizzi, Costanza1
- Alchemy16
- Alchemy--Bibliography1
- Aldobrandini, Giovanni degli1
- Aleramo, Marquis of Monferrato, -9671
- Alessandri, Alessandro degli1
- Alessandri, Bartolomeo degli2
- Alessandri, Niccolò degli1
- Alessandri, Piero degli9
- Alessandri, Pietro degli2