- Juana, la Loca, Queen of Castile, 1479-15551
- Juana, of Austria, Princess of Portugal, 1535-15732
- Juana, of Austria, Princess of Portugal, 1535-1573--Correspondence1
- Judaism6
- Judaism--Customs and practices2
- Judaism--Doctrines1
- Judaism--Liturgy1
- Judeo-Arabic language2
- Judeo-Arabic letters1
- Judges (Islamic law)1
- Judges--Selection and appointment1
- Judgment Day (Islam)1
- Jugurthine War (111-105 B.C.)6
- Julii family1
- Julius III, Pope, 1487-15552
- Justice, Administration of2
- Jāmiʻ al-Azhar5
- Jāmiʻ al-Muẓaffarī (Damascus, Syria)1
- Jāmiʻ al-Umawī al-Kabīr (Aleppo, Syria)1
- Jāmiʻ al-ṣaḥīḥ (Bukhārī, Muḥammad ibn Ismāʻīl)1