- Assassination1
- Astrology and death1
- Astronomical instruments1
- Astronomy, Greek1
- Astronomy--Popular works1
- Audiore, Antonio1
- Aurispa, Giovanni, approximately 1376-14591
- Austria--Lambach (Upper Austria)1
- Autographs1
- Averroës, 1126-1198. Talkhīs kitāb al-ʻIbārah1
- Averroës, 1126-1198. Talkhīṣ kitāb al-maqūlāt1
- Averroës, 1126-1198. Talkhīṣ madkhal Furfūriyūs1
- Bakers1
- Banks and banking1
- Barbara, Saint1
- Bardi, Giovanni de', conte di Vernio, 1534-16121
- Bartoli, Dianora1
- Bartoli, Giannozzo1
- Bartolomeo, da Petroio, 1488?-15541
- Basilica di S. Marco Evangelista al Campidoglio (Rome, Italy)1