Author
- Immanuel Bonfils1
- Immanuel Tremellius1
- Innocent III1
- Inquisition Sicily)1
- Ippolito Libri1
- Isaac Alfasi1
- Isaac the Blind1
- Isabella I of Castile1
- Ismāʻīl Ghāzānī1
- Ismāʻīl Jarrāḥī1
- Ismāʻīl ibn Abī Bakr Ibn al-Muqrī1
- Ismāʻīl ibn ʻAlī Ibn Muʻallá1
- Izz al-Din ibn Hibatullah ibn Abi l-Hadid1
- Jabir ibn Hayyan1
- Jacob ben Asher1
- Jacob ben David ben Yom Tov1
- Jacob ibn Habib1
- Jacobo Bellenden1
- Jacobus Dinetus1
- Jagaddhara1