- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221? Qānūnchah1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221?. Qānūnchah1
- Jihad2
- Jiménez de Cisneros, Francisco, 1436?-15171
- Jiménez de Enciso family1
- Jiménez de Enciso, Andrés1
- Jiménez de Enciso, Diego1
- Jiménez de Enciso, Pedro1
- Jinn4
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- Joachim, Saint1
- Joannes de Caligariis1
- Job (Biblical figure)1
- Johannes filius Roberti de Cruce1
- John Chrysostom, Saint, -40720
- John I, King of Portugal, 1357-14332
- John II, King of Aragon, 1397-14791
- John II, King of Portugal, 1455-14951
- John IV, King of Portugal, 1604-16561