- Astrology, Arab1
- Astrometeorology1
- Astronomy, Ancient1
- Astronomy, Greek1
- Augustinians1
- Aurispa, Giovanni, approximately 1376-14591
- Austria--Lambach (Upper Austria)1
- Austrian1
- Badr al-ṭāliʻ fī ḥall Jamʻ al-jawāmiʻ (Maḥallī, Jalāl al-Dīn Muḥammad ibn Aḥmad)1
- Baglioni, Niccolò1
- Bahjah al-Wardīyah (Ibn al-Wardī, Zayn al-Dīn ʻUmar ibn al-Muẓaffar)1
- Baldini, Antonio1
- Baldo, Antonio di1
- Baldo, Vestro di1
- Balducci, Domenico1
- Balducci, Nonnina1
- Balestriere, Antonio1
- Ballads1
- Bandinelli, Lisabetta1
- Bandinelli, Lodovico1