Author
- Jacopo Ragone1
- Jalal al-Din al-Qazwini1
- Jean de Malian1
- Joannes Thomas Beltamino1
- Joham de Vernoils1
- Johannes Auerbach1
- Johannes Meyer1
- Johannes Paulus1
- Johannes von Freiburg1
- Johannes von Kastl1
- Johannes von Werdea1
- John Chrysostom1
- John Cleseby1
- John II of Castile1
- John Mandeville1
- John of Glastonbury1
- John of Lancaster, 1st Duke of Bedford1
- John, Duke of Berry1
- Joseph Angelet1
- Joseph ben Abraham Gikatilla1