Author
- Isaak Aaron Ettinger1
- Isaak ben Meïr from Düren1
- Isabella I of Castile1
- Isidore of Seville1
- Ismail bin Mohammad Rizi1
- Ismāʻīl Jarrāḥī1
- Ismāʻīl Qarah Kamāl1
- Ismāʻīl ibn Luṭf Allāh Bākharzī1
- Ismāʻīl ibn Muḥammad Māzandarānī1
- Ismāʻīl ibn Sinān Sīwāsī1
- Ismāʻīl Ḥaqqī Āsikjīʹzādah1
- Isobel Salcedo Larralde1
- Israel Alnaqua1
- Israel Yaakov Algazi1
- Issachar ben Mordecai ibn Susan1
- Izz al-Din ibn 'Abd al-Salam1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Izzatullah Bengali1
- Jaafar Al-Sadiq1
- Jabir ibn Hayyan1