Author
- Jayakr̥ṣṇa1
- Jayyānī, al-Ḥusayn ibn Muḥammad, 1035-1105?1
- Jaʻfar Astarābādī1
- Jaʻfar ibn Khaḍir Janājī1
- Jean Bénard1
- Jean de Malian1
- Jerome1
- Joan Martines1
- Joannes Oliva1
- Joham de Vernoils1
- Johannes Auerbach1
- Johannes Mellarinus1
- Johannes Paulus1
- Johannes Tostius1
- Johannes von Freiburg1
- Johannes von Kastl1
- John Cornelius1
- John Gage1
- John Mandeville1
- John Montgomery1