- Italy--Scarperia1
- Italy--Serravalle Pistoiese1
- Italy--Sette Comuni1
- Italy--Syracuse1
- Italy--Terranuova Bracciolini1
- Italy--Umbria1
- Italy--Urbino1
- Italy--Veneto1
- Italy--Vercelli1
- Italy--Vernio1
- Italy--Vicopisano1
- Italy--Villanova Monteleone1
- Izmīrī, Muṣṭafá ibn Rajab, active 17th century1
- Iḥyāʼ ʻulūm al-dīn (Ghazzālī)1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Maṭāliʻ al-anẓār1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tashyīd al-Qawāʻid1
- Jacopo, Bernardo di1
- Jacopo, Giovanni di1
- Jaghmīnī, Maḥmūd ibn Muḥammad, -1221?1
- Jaina mythology1