Author
- Isaac Aboab of Castile1
- Isaac Albalag1
- Isaac Israeli ben Joseph1
- Isaac Israeli ben Solomon1
- Isaac Lattes1
- Isaac Lopez1
- Isaac ibn Ezra1
- Isaac ibn Ghiyyat1
- Isaac of Troki1
- Isaak ben Meïr from Düren1
- Ishmael ben Abraham Isaac ha-Kohen1
- Ismail al-Isfahani1
- Ismāʻīl Jarrāḥī1
- Ismāʻīl Qarah Kamāl1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Ismāʻīl ibn Muḥammad Māzandarānī1
- Isḥāq ibn Ḥasan Tūqādī1
- Ivo of Chartres1
- Izz al-Din ibn 'Abd al-Salam1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1