- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221? Qānūnchah1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221?. Qānūnchah1
- Jihad1
- Jiménez de Cisneros, Francisco, 1436?-15171
- Jinn3
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- John I, King of Portugal, 1357-14332
- John II, King of Aragon, 1397-14791
- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- John VIII Palaeologus, Emperor of the East, 1392-14481
- John, Duke of Burgundy, 1371-14191
- John, King of England, 1167-12161
- John, of Damascus, Saint1
- John, the Apostle, Saint1
- John, the Baptist, Saint1
- Joseph (Son of Jacob)5
- Joseph (Son of Jacob) in the Qurʼan1