- Joseph (Son of Jacob)1
- Judaism--Customs and practices1
- Judeo-Arabic letters1
- Judges (Islamic law)1
- Judgment Day (Islam)1
- Julii family1
- Justice, Administration of1
- Jāmiʻ al-ṣaḥīḥ (Bukhārī, Muḥammad ibn Ismāʻīl)1
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)1
- Kanz al-wuṣūl ilá maʻrifat al-uṣūl (Bazdawī, ʻAlī ibn Muḥammad)1
- Kashshāf (Zamakhsharī, Maḥmūd ibn ʻUmar)1
- Kaʻbah (Mecca, Saudi Arabia)1
- Kemalpaşazade, 1468 or 1469-15341
- Kemalpaşazade, 1468 or 1469-1534. Iṣlāḥ wa-al-īḍāḥ1
- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 1232-1292. Mughnī fī uṣūl al-fiqh1
- Kings and rulers--Duties1
- Kings and rulers--Heraldry1
- Kirchmair, Georg, 1481-15541
- Kirmānī, Maḥmūd ibn Muḥammad, 1329?-1404 or 1405. Farāʼiḍ al-ījāz1
- Lamberto, Jacopo di1