Author
- Isaac ibn Ghiyyat1
- Isaac of Troki2
- Isaac the Blind1
- Isaak Aaron Ettinger1
- Isaak ben Meïr from Düren1
- Isabella I of Castile1
- Isaiah di Trani1
- Ishmael ben Abraham Isaac ha-Kohen3
- Isidore of Seville19
- Iskandar Beg Munshi7
- Iskandar Rūmī1
- Ismail al-Isfahani1
- Ismail bin Mohammad Rizi1
- Ismail ibn Hammad al-Jawhari27
- Ismāʻīl Jarrāḥī1
- Ismāʻīl Mufīd1
- Ismāʻīl Qarah Kamāl1
- Ismāʻīl ibn Abī Bakr Ibn al-Muqrī3
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Ismāʻīl ibn Ibrāhīm İsfendiyaroǧlu3