Author
- John of Seville ?1
- John Dokeianos1
- Jonathan Eybeschutz1
- Joseph Haslewood1
- Joseph Nasi1
- Joseph ben Gorion1
- Joseph ben Moses Sarfati1
- Joshua ben Israel Benveniste1
- Joshua ibn Shuaib1
- José Pellicer1
- Juan López Ossorio1
- Juan Martínez Silíceo1
- Juan Páez de Castro1
- Judah Leib Prossnitz1
- Judah ben Saul ibn Tibbon1
- Julianus Pomerius1
- Justinian I1
- Kabbāshī, Aḥmad1
- Kalb Ḥusayn ibn Faz̤l ʻAlī Tabrīzī1
- Kalyanamalla1