- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-ʻaqāʼid fī sharḥ Tajrīd al-qawāʻid2
- Jaina literature, Prakrit2
- Jainism--Prayers and devotions2
- Jawī Zādah, Muḥammad ibn Ilyās, -1547 or 1548. Risālah fī al-masḥ ʻalá al-khuffayn2
- Jaʻfar al-Ṣādiq, 702?-765 or 7662
- Jewish drama2
- Jewish hymns2
- Jewish martyrs2
- Jewish mourning customs2
- Jewish religious schools2
- Jewish travelers2
- Jewish way of life2
- Jews--Education2
- Jews--Emancipation2
- John I, King of Portugal, 1357-14332
- Joseph (Son of Jacob) in the Qurʼan2
- Joseph Della Reina, active 15th century2
- Juana, of Austria, Princess of Portugal, 1535-15732
- Judaism--Ari rite2
- Judaism--Controversial literature2