- Jiménez de Enciso, Diego1
- Jiménez de Enciso, Pedro1
- Joachim, Saint1
- John I, King of Portugal, 1357-14331
- John II, King of Aragon, 1397-14791
- John II, King of Portugal, 1455-14951
- John, King of England, 1167-12161
- Joseph (Son of Jacob)1
- Juana, of Austria, Princess of Portugal, 1535-1573--Correspondence1
- Judaism--Ari rite1
- Judaism--Prayers and devotions1
- Judeo-Arabic literature1
- Judeo-Persian language1
- Judges1
- Judges--Selection and appointment1
- Judgment Day1
- Judicial process (Islamic law)1
- Jumʻah1
- Jurisprudence1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Sharḥ Farāʼiḍ al-Sirājīyah1