Author
- Isobel Salcedo Larralde1
- Isḥāq1
- Isḥāq ibn Yūsuf Ṣardafī1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jacob Berab1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jaghmini1
- Jaimini1
- Jalal al-Din Davani1
- Jayadeva1
- Jayakr̥ṣṇa1
- Jean Filesac1
- Jean-François Roussin1
- John Davnay1
- John Dennis1
- John Fortescue1
- John Sergeant1
- John de Beauchesne1
- Josef ibn Tabul1
- Joseph ben Abraham Gikatilla1