Author
- Jalal al-Din Davani1
- Jalal al-Din al-Qazwini1
- Jamālī Ardistani1
- Jean Barthélémy1
- Jean Gerson1
- Jean de Wavrin1
- Johann Herolt1
- Johannes Milis1
- John Chrysostom1
- John of Seville ?1
- Jordan von Quedlinburg1
- Juana I of Castile1
- Khvājah Muḥammad Pārsā1
- Khālid ibn ʻAbd Allāh al-Azharī1
- Leo I1
- Lorenzo de' Medici1
- Luca Pacioli1
- Luigi de' Medici1
- Majd ad-Dīn Ibn Athir1
- Manyas Oǧlu1