Author
- António das Chagas1
- Arles1
- Arnaldus, of Brussels1
- Arnold-André Sittard1
- Arnulf of Bohéries1
- Arnulf of Lisieux1
- Arnulf of Orléans1
- Arşı Baba1
- Asad Allāh ibn Ismāʻīl Kāẓimī1
- Asad Allāh ibn ʻAbd al-Ghaffār Nādir Māzandarānī1
- Ascanio Savorgnano1
- Asher ben Jehiel1
- Ashkenazi, Malkiel, -approximately 16201
- Asif al-Zaman, 1885-19611
- Assar Tabrizi1
- Ataullah Mehmet Efendi1
- Athīr al-Dīn al-Abharī1
- Audax1
- Augustinians1
- Augustinus de Leonissa1