Author
- Hugh of Balma1
- Humphrey Wellys1
- Iacobo Cattaneo Lagomarsino1
- Ibn Kemal1
- Ibn Sab'in1
- Ibn Zanjalah1
- Ibn al-Nafis1
- Ibrāhīm Ibn ʻAbd al-Ṣamad1
- Ibrāhīm al-ʻĀmilī1
- Ibrāhīm ibn ʻAlī Qalqashandī1
- Imam Birgivi1
- Imbert Feutrier1
- Immanuel Bonfils1
- Immanuel Tremellius1
- Ismāʻīl Jarrāḥī1
- Ismāʻīl ibn Abī Bakr Ibn al-Muqrī1
- Jabir ibn Hayyan1
- Jacob ben Asher1
- Jacobo Bellenden1
- Jacobus Dinetus1