Author
- Jacob ben David ben Yom Tov1
- Jacob ibn Habib1
- Jalal al-Din Davani1
- Jalaluddin al-Mahalli1
- Jean Bénard1
- Joachim Bendel1
- Joan Martines1
- Johannes Mellarinus1
- Johannes Schöner1
- John Montgomery1
- John de Beauchesne1
- John of Ibelin1
- Joseph Nasi1
- Joseph ben Abraham Gikatilla1
- João Freire1
- João Gomes da Silva1
- Juan Gallo1
- Juan de Zumárraga1
- Juana I of Castile1
- Kamal Khujandi1