- Alchemy--Bibliography1
- Alcuin, 735-8041
- Alcuin, 735-804. Correspondence1
- Aldobrandini, Giovanni degli1
- Alessandri, Alessandro degli1
- Alessandri, Niccolò degli1
- Alessandro, Pietro di1
- Alexander Balas, King of Syria, -145 B.C.1
- Alexander III, Pope, -11811
- Alexander, de Villa Dei. Doctrinale puerorum1
- Allegory1
- Alum tawed bindings1
- Alum tawed thongs (Bindings)1
- Amadori, Lorenzo1
- Ambrogio, Leonardo d'1
- Ambrose, Saint, Bishop of Milan, -3971
- Ambrosian rite (Catholic Church)1
- Amedei, Bartolomeo1
- Amideo, Chele d'1
- Andrea, Antonio di1