Author
- John Wycliffe1
- John XXII1
- John de Breton1
- John de Seccheville1
- John of Damascus1
- John of Glastonbury1
- John of Howden1
- John of Lancaster, 1st Duke of Bedford1
- John of Saxony1
- John, Duke of Berry1
- Joseph Angelet1
- Joseph ben Abraham Gikatilla1
- Joseph ben Judah ibn Aknin1
- José Romero de Tejada y Artacho1
- João Freire1
- Juan Alvarez1
- Juan Antonio de Hozes Sarmiento1
- Juan Baptista de Gatica1
- Juan Félix de Rújula1
- Juan Ortiz Campoy1