Author
- Johannes Meyer1
- John Chrysostom1
- John Cleseby1
- John Eyr1
- John Gage1
- John Skyrrow1
- John of Glastonbury1
- John of Lancaster, 1st Duke of Bedford1
- John, Duke of Berry1
- Joseph Angelet1
- Joseph ben Abraham Gikatilla1
- Josephus1
- 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
- Juan Perez Barahona1