- Italy--Syracuse1
- Italy--Verona1
- Japanese poetry1
- Jesuit drama, Spanish1
- Jewish astronomy1
- Jewish courts1
- Jewish interpretations of Jesus Christ1
- Jewish magic1
- Jewish religious poetry, Judeo-Arabic1
- Jews--Medicine1
- John I, King of Portugal, 1357-14331
- Joseph Della Reina, active 15th century1
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism--Liturgy--Texts1
- Judeo-Arabic language1
- Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf, 1340-1413. Miṣbāḥ fī sharḥ al-Miftāḥ1
- Jāmiʻ al-ṣaḥīḥ (Bukhārī, Muḥammad ibn Ismāʻīl)1
- Jārbardī, Fakhr al-Dīn Aḥmad ibn al-Ḥasan, d. 1345. Mughnī fī ʻilm al-naḥw1
- Karaites--Liturgy1
- Kiddush1