Author
- James of Lausanne1
- James of Milan1
- Jean Carteron1
- Jean Dupin1
- Jean de Roquetaillade1
- Johanna Hawkeslowe (Sr.)1
- Johannes Auerbach1
- Johannes Nider1
- Johannes Paulus1
- Johannes von Kastl1
- Johannis Hieronymus1
- John Burgh1
- John Cleseby1
- John Davnay1
- John Versor1
- John Wycliffe1
- John Zonaras1
- John of Lancaster, 1st Duke of Bedford1
- John of Saxony1
- John of Wales1