Author
- Jayadeva1
- Jayyānī, al-Ḥusayn ibn Muḥammad, 1035-1105?1
- Jaʻfar ibn Khaḍir Janājī1
- Jean Bénard1
- Jean Dupin1
- Jean Marot1
- Jean de Roquetaillade1
- Jerome de Prado1
- Jewish Community of Amsterdam, Netherlands1
- Jewish Community of Pitigliano, Italy1
- Joan Martines1
- Joham de Vernoils1
- Johann Herolt1
- Johann Hertzhaimer1
- Johannes Auerbach1
- Johannes Lichtenberger1
- Johannes Mellarinus1
- Johannes Nider1
- Johannes Paulus1
- Johannes Schöner1