Author
- Isaac Israeli ben Joseph1
- Isaac Lopez1
- Isaac Newton1
- Isaac Sasportas1
- Isaac the Blind1
- 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 Aḥmad Ibn al-Athīr1
- Ismāʻīl ibn Luṭf Allāh Bākharzī1
- Ismāʻīl ibn Muḥammad Māzandarānī1
- Ismāʻīl Ḥaqqī Āsikjīʹzādah1
- Isobel Salcedo Larralde1
- Israel Alnaqua1
- Israel Yaakov Algazi1
- Issachar ben Mordecai ibn Susan1