Author
- John Frederick II of Saxony1
- John II of Castile1
- John de Beauchesne1
- John of Glastonbury1
- John of Ibelin1
- John of Lancaster, 1st Duke of Bedford1
- John, Duke of Berry1
- Josephus1
- José Antonio de Alzate y Ramírez1
- João Freire1
- João Gomes da Silva1
- Juan Félix de Rújula1
- Juan Gallo1
- Juan Ortiz Campoy1
- Juan de Mena1
- Juan de Torquemada1
- Juan de Zumárraga1
- Judah Leib Ben Zeev1
- Julius III1
- Jñānamṛtapata1