Author
- 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
- Kamāl al-Dīn Turkumānī3
- Kapila3
- Keśavamiśra3
- Khayr al-Din al-Ramli3
- Khālid ibn ʻAbd Allāh al-Azharī3
- Kingdom of England3