Author
- Johannes von Freiburg1
- Johannes von Kastl1
- John Cornelius1
- John Gage1
- John Mandeville1
- John Montgomery1
- John of Glastonbury1
- Joseph Angelet1
- Joseph ben Gorion1
- Joshua Benzion Segre1
- José Antonio de Alzate y Ramírez1
- Juan Antonio de Hozes Sarmiento1
- Juan Gallo1
- Juan de Foxá1
- Juan de Torquemada1
- Judah ben Saul ibn Tibbon1
- Julius II1
- Kamal al-Din ibn al-Humam1
- Kamalākara Bhaṭṭa1
- Kamāl al-Dīn Turkumānī1