- Juana, la Loca, Queen of Castile, 1479-15551
- Juana, of Austria, Princess of Portugal, 1535-15733
- Judaism2
- Judaism--Ari rite1
- Judaism--Customs and practices1
- Judaism--Prayers and devotions1
- Judeo-Arabic language1
- Judeo-Arabic literature2
- Judeo-Persian language1
- Judges1
- Judgment Day (Islam)1
- Judicial process (Islamic law)1
- Julius III, Pope, 1487-15551
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Miṣbāḥ fī sharḥ al-Miftāḥ3
- Justa, Saint, -approximately 2871
- Justice, Administration of1
- Jābir ibn Ḥayyān1
- Jāmiʻ al-Azhar1
- Jāmiʻ al-Muẓaffarī (Damascus, Syria)1
- Jāmiʻ al-ṣaḥīḥ (Bukhārī, Muḥammad ibn Ismāʻīl)3