Author
- Ismail al-Isfahani1
- Ismāʻīl Jarrāḥī1
- Ismāʻīl Qarah Kamāl1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Ismāʻīl ibn Muḥammad Māzandarānī1
- Ismāʻīl ibn Sinān Sīwāsī1
- Isḥāq ibn Ḥasan Tūqādī1
- Ivo of Chartres1
- Izz al-Din ibn 'Abd al-Salam1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Ja'far Kashfi1
- Jaafar Al-Sadiq1
- Jacob HaLevi of Marvège1
- Jacob ben David ben Yom Tov1
- Jacob ben Hayyim Zemah1
- Jacob ibn Habib1
- Jacobus Balbi1
- Jacobus Dinetus1
- Jacobus de Burgo1
- Jacomo Veronese1