Author
- Jamālī Ardistani1
- Jawād ibn Saʻd Jawād al-Baghdādī1
- Jayadeva1
- Jayyānī, al-Ḥusayn ibn Muḥammad, 1035-1105?1
- Jaʻfar Astarābādī1
- Jaʻfar Vāʻiẓ1
- Jean Dupin1
- Jean Gerson1
- Jerónimo Román y Zamora1
- Jews1
- Joannes de Crivelli1
- Joham de Vernoils1
- Johann Herolt1
- Johannes Gherinx1
- Johannes Lichtenberger1
- Johannes Mellarinus1
- Johannes Nider1
- Johannes Paulus1
- Johannes Schöner1
- Johannes Tostius1