Scribe
- Hādī ibn Bahāʼ al-Dīn1
- Ibn Abī Ṭālib, ʻAlī ibn Maḥmūd, active 13th century?1
- Ibn Muḥammad Jaʻfar Muḥammad Bāqir al-Sharīf al-Naṣīr al-Ṭūsī1
- Ibn Muḥammad Riz̤ā Muḥammad1
- Ibrāhīm Bahjat Ḥamīdī1
- Ibrāhīm ibn Abī al-Suʻūd Jīzāwī1
- Isidore of Kyiv1
- Jafājī, Muḥammad1
- Jehan Engremer1
- Joannes Suardus1
- Johann Pilter1
- Johann von Neuburg1
- Johannes Theatinus Cycurius1
- Johannes de Kuppferberg1
- Johannes of Regensburg1
- Johannis Caulier1
- John Clerk1
- Joseph ben Abraham Finzi1
- Kamal al-Din al-Ghazzi1
- Karmiyānī, Aḥmad ibn Muḥammad1