- Italy--Terranuova Bracciolini1
- Italy--Vernio1
- Italy--Vicopisano1
- 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
- Jaʻbarī, Ibrāhīm ibn ʻUmar, 1242 or 1243-1331 or 1332. Wāḍiḥah fī tajwīd al-Fātiḥah1
- Jean, de Verdun1
- Jewish astronomy1
- Jewish ethics1
- Jewish ethics in literature1
- Jewish law1
- Jews--Legal status, laws, etc.1
- Jews--Persecutions1
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- Joannes de Caligariis1
- John, of Daylam1
- Juan II, King of Castile and Leon, 1405-14541
- Judaism--Customs and practices1