- Jighmīnī, Maḥmūd ibn Muḥammad, -1221?. Qānūnchah1
- Jihad1
- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism23
- Judaism--Ari rite1
- Judaism--Customs and practices25
- Judaism--Doctrines1
- Judaism--Liturgy26
- Judaism--Prayers and devotions12
- Judeo-Arabic literature3
- Judeo-Italian language1
- Judeo-Persian literature2
- Judgment Day (Islam)2
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Risālah al-kubrá fī al-manṭiq1
- Jāmiʻ al-Muẓaffarī (Damascus, Syria)1
- Jāmiʻ al-ṣaghīr (Suyūṭī)4
- Jāmiʻ al-ṣaḥīḥ (Bukhārī, Muḥammad ibn Ismāʻīl)5