Author
- Ismāʻīl ibn Abī Bakr Ibn al-Muqrī1
- Ismāʻīl ibn Aḥmad Ibn al-Athīr1
- Ismāʻīl ibn Muḥammad Māzandarānī1
- Issachar ben Mordecai ibn Susan1
- Jabir ibn Hayyan1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacob ben Machir ibn Tibbon1
- Jacobo Bellenden1
- Jacobus Dinetus1
- Jacobus de Teramo1
- Jacobus de Voragine1
- Jacopo Ragone1
- Jagannatha Panditaraja1
- Jaghmini1
- Jalal al-Din al-Qazwini1
- Jalāl al-Dīn al-Thīrī1
- Jamāl al-Dīn Khvānsārī1
- Jamālī Ardistani1
- Jawad al-Amili1
- Jayadeva1