Author
- Jacques Bruyant1
- Jacques de Vitry1
- James of Viterbo1
- Jean Gerson1
- Jean Marot1
- Jean Ruel1
- Jean de Roquetaillade1
- Jean-François Roussin1
- Jewish Community of Carpentras, France1
- Joan Martines1
- Johannes Hymmonides1
- Johannes von Freiburg1
- John Capgrave1
- John Davnay1
- John Larry England1
- John Mandeville1
- John Shirley1
- John Tiptoft, 1st Earl of Worcester1
- John Wycliffe1
- John XXII1