Author
- Innocent III1
- Jacobus de Cessolis1
- Jacobus de Voragine1
- Jacques Legrand1
- Jakob Wimpfeling1
- Jean Gerson1
- Jean de Malian1
- Joanna of Austria, Princess of Portugal1
- Joannes de Crivelli1
- Johann Neudörffer the Elder1
- Johannes Gherinx1
- Johannes Hymmonides1
- Johannes Nider1
- Johannes ab Indagine1
- Johannes von Freiburg1
- John Chrysostom1
- John Gower1
- John XXII1
- José Romero de Tejada y Artacho1
- Juan Alvarez1