Author
- Isaac Alfasi1
- Isaac the Blind1
- Isabella I of Castile1
- Ismail ibn Hammad al-Jawhari1
- Ismāʻīl Ghāzānī1
- Ismāʻīl ibn Ibrāhīm İsfendiyaroǧlu1
- Ismāʻīl ibn ʻAlī Ibn Muʻallá1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jacob ben David ben Yom Tov1
- Jacob ibn Habib1
- Jagaddhara1
- Jaghmini1
- Jalaluddin al-Mahalli1
- Jean Bayard1
- Jean Marot1
- Jean Passerat1
- Jean de Bernuy1
- Jerome de Prado1
- Jerónimo Román y Zamora1
- Joan Martines1