Author
- Jaghmini1
- Jean Barthélémy1
- Jean Germain1
- Jean Gerson1
- Jean de Lignieres1
- Jean de Wavrin1
- Johann Herolt1
- Johannes Milis1
- John Burgh1
- John Capgrave1
- John Chrysostom1
- John Gower1
- John Mandeville1
- John XXII1
- John of Seville1
- John, Duke of Berry1
- Jordan von Quedlinburg1
- Juana I of Castile1
- Judah ben Saul ibn Tibbon1
- Junayd ibn Sandal Baghdādī1