Author
- Al-Khazini1
- Al-Mawardi1
- Alain of Lille1
- Albertanus of Brescia1
- Alberto Cattani1
- Aldobrandino da Siena1
- Alexander of Villedieu1
- Amaracandrasūri1
- Anandabodha Paramahansa1
- Ananta Bhaṭṭa1
- Andreas Vesalius1
- Andreas de Escobar1
- Aniruddha1
- Antonius de Vecelli1
- Arnaldus de Villa Nova1
- Aṅgiras1
- Baba1
- Bartholomaeus de Montagna1
- Bartholomew of Braganca1
- Bartholomäus Mariensüss1