Author
- Jean Gerson1
- Jean de Malian1
- Joannes de Crivelli1
- Johann Herolt1
- Johannes Gherinx1
- Johannes Nider1
- Johannes Paulus1
- Johannes ab Indagine1
- Johannes von Werdea1
- John Cleseby1
- John Gower1
- John of Genoa1
- John of Glastonbury1
- John of Howden1
- Juvenal1
- Konrad III. von Soltau1
- Lactantius1
- Lope de Espejo1
- Lorenzo Bonincontri1
- Ludovicus Valentia de Ferraria1