Author
- Ismail ibn Hammad al-Jawhari1
- Jabir ibn Hayyan1
- Jacobus de Teramo1
- Jacobus de Voragine1
- Jalal al-Din Davani1
- Jalal al-Din al-Qazwini1
- Jalāl al-Dīn al-Thīrī1
- Jean Bénard1
- Jerome1
- Joachim Bendel1
- Johan de Arcenay1
- Johannes Auerbach1
- Johannes Lemp1
- John Mandeville1
- John Montgomery1
- John de Beauchesne1
- João Gomes da Silva1
- Julius III1
- Lamii çelebi1
- Leonardo Emo1