Author
- Johann Eck1
- Johann Herolt1
- Johannes Mathesius1
- John Chrysostom1
- John Dominici1
- John Herd1
- John of Wales1
- Juan Pérez de Cabrera1
- Juan de Garnica1
- Juana I of Castile1
- Julian of Toledo1
- Justinian I1
- Juvenal1
- Kisei Yamamoto1
- Leo I1
- Leo X1
- Leon Battista Alberti1
- Leontios of Neapolis1
- Lopez family (Toledo, Spain)1
- Lorenzo Bonincontri1