Author
- Johannes Tostius1
- Johannes von Kastl1
- John Burgh1
- John Cassian1
- John Cornelius1
- John Felton1
- John Gower1
- John Larry England1
- John Mandeville1
- John Montgomery1
- John XXI1
- John of Glastonbury1
- John of Wales1
- Jordan von Quedlinburg1
- Joseph Nasi1
- Joseph Trani1
- Joseph ben Judah ibn Aknin1
- Joseph ben Moses Sarfati1
- Joseph ibn Migash1
- Josephus1