- Jewish interpretations of Jesus Christ1
- Jewish merchants1
- Judaism1
- Judges (Islamic law)1
- Julian, of Eclanum, Bishop, 380-approximately 4551
- Julii family1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-14131
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyah ʻalá Sharḥ Mukhtaṣar al-Muntahá1
- Justa, Saint, -approximately 2871
- Kalbī, Diḥyah ibn Khalīfah, -approximately 6701
- Karmī, Marʻī ibn Yūsuf, -1623 or 16241
- Kashshāf (Zamakhsharī, Maḥmūd ibn ʻUmar)1
- Kemalpaşazade, 1468 or 1469-1534. Risālah fī al-haykal al-insānī1
- Khadījah, -approximately 6191
- Khamrīyah (Ibn al-Fāriḍ, ʻUmar ibn ʻAlī)1
- Khiḍr (Legendary character)1
- Kinot1
- Ladino poetry1
- Language and languages--Philosophy1
- Latin poetry1