Author
- Isidore of Seville1
- Jacob Anatoli1
- Jacob Berab1
- Jacob Israel Karmi1
- Jacob Meyer1
- Jacob ben Hayyim Zemah1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jami1
- Jerome de Prado1
- Johannes ab Indagine1
- John XXII1
- Josef ibn Tabul1
- Joseph ben Gorion1
- Joseph ben Judah ibn Aknin1
- Joseph ibn Migash1
- Joshua ben Israel Benveniste1
- Judah Leib Prossnitz1
- Judah ben Saul ibn Tibbon1
- Kurdī, ʻAbd Allāh ibn Muḥammad, d. 16541
- Kāẓim ibn Qāsim Rashtī1