Author
- Imam Ar-Rafi'i3
- Innocent III3
- Innocent IV3
- Ismāʻīl ibn Abī Bakr Ibn al-Muqrī3
- Jabartī, Ḥasan ibn Ibrāhīm, 1698 or 1699-1774?3
- Jacob ben Asher3
- Jacobus de Cessolis3
- Jacobus de Teramo3
- Jalal Al-Din Al-Khabazi3
- Jalal al-Din al-Qazwini3
- Jayakr̥ṣṇa3
- Jean Gerson3
- Jewish Community of Carpentras, France3
- Johannes de Sacrobosco3
- John Gower3
- Joseph ben Abraham Gikatilla3
- Josephus3
- Juvenal3
- Kamalakara3
- Kapila3