- Italy--Sicily1
- Italy--Siena1
- Italy--Syracuse1
- Italy--Verona1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-ʻaqāʾid fī sharḥ Tajrīd al-qawāʻid1
- Jaina literature, Prakrit1
- Jainism1
- Japanese poetry1
- Jawī Zādah, Muḥammad ibn Ilyās, -1547 or 1548. Risālah fī al-masḥ ʻalá al-khuffayn1
- Jaʻbarī, Ibrāhīm ibn ʻUmar, 1242 or 1243-1331 or 1332. Wāḍiḥah fī tajwīd al-Fātiḥah1
- Jerónima de la Asunción, madre, 1555-16301
- Jesuit drama, Spanish1
- Jesuits1
- Jewelry1
- Jewish astronomy1
- Jewish calendar1
- Jewish courts1
- Jewish illumination of books and manuscripts1
- Jewish interpretations of Jesus Christ1
- Jewish magic1