Author
- James of Viterbo1
- Jamshīd al-Kāshī1
- Jamāl al-Dīn Aḥmad ibn Muḥammad Ẓāhirī1
- Jamālī Ardistani1
- Jawad al-Amili1
- Jayyānī, al-Ḥusayn ibn Muḥammad, 1035-1105?1
- Jazūlī, Yaḥyá ibn Mūsá1
- Jaʻfar Vāʻiẓ1
- Jaʻfar ibn al-Ḥusayn Shūshtarī1
- Jean Gerson1
- Jean Manesca1
- Jean-Claude de La Poype de Vertrieu1
- Johann Herolt1
- Johannes Gherinx1
- Johannes ab Indagine1
- John Chrysostom1
- John Lydgate1
- John Tiptoft, 1st Earl of Worcester1
- John of Saxony1
- John of Wales1