Author
- John II of Castile1
- John Lydgate1
- John Sergeant1
- John Versor1
- John XXI1
- John Zonaras1
- John of Garland1
- John of Ibelin1
- John of Seville ?1
- John Dokeianos1
- Jonathan Eybeschutz1
- Joseph Haslewood1
- Joseph Nasi1
- Joseph ben Moses Sarfati1
- Josephus1
- Joshua ben Israel Benveniste1
- Joshua ibn Shuaib1
- José Pellicer1
- Juan Gallo1
- Juan López Ossorio1