- Jinn1
- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- John, the Baptist, Saint1
- Joseph (Son of Jacob) in the Qurʼan1
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism--Ari rite1
- Judaism--Doctrines1
- Judaism--Liturgy--Texts1
- Judeo-Italian language1
- Jurisprudence1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-14131
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Risālah al-kubrá fī al-manṭiq1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Sharḥ khuṭbah al-Quṭbīyah1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Ḥāshiyat al-Tajrīd1
- Justice--Religious aspects--Islam1
- Jābir ibn Ḥayyān1
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)1
- Jāmī, 1414-1492. Poems1