Author
- Antonio de la Torre1
- Antonius de Carlenis1
- Antonius de Vecelli1
- António Nunes Ribeiro Sanches1
- António Vieira1
- Apostolic Camera1
- Arles1
- Armenian Catholic Church1
- Arnaldus de Villa Nova1
- Arnold-André Sittard1
- Arnulf of Bohéries1
- Arrigucci family1
- Arīnī, Muḥammad ibn Najm1
- Arşı Baba1
- Ascanio Sforza1
- Asher ben Jehiel1
- Ashkenazi, Malkiel, -approximately 16201
- Ataullah Mehmet Efendi1
- Athanasius of Alexandria1
- Athīr al-Dīn al-Abharī1