- Italy--Bologna2
- Italy--Nizza Monferrato2
- Italy--Rivarolo Ligure2
- Italy--Rovigo2
- Italy--Senigallia2
- Italy--Tuscany2
- Italy--Verona2
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-qawāʼid fī sharḥ Tajrīd al-ʻaqāʼid2
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-ʻaqāʼid fī sharḥ Tajrīd al-qawāʻid2
- Jainism2
- Japan2
- Jawī Zādah, Muḥammad ibn Ilyās, -1547 or 1548. Risālah fī al-masḥ ʻalá al-khuffayn2
- Jaʻbarī, Arslān ibn Yaʻqūb, -1300. Risālat al-tawḥīd2
- Jerome, Saint, -419 or 4202
- Jewish astrology2
- Jewish drama2
- Jewish families2
- Jewish hymns2
- Jewish martyrs2
- Jewish religious poetry, Ladino2