- Jaghmīnī, Maḥmūd ibn Muḥammad, -1221?1
- Jaunaye, Etienne Chaton, sieur de, 1543-1
- Jaymes, Diego1
- Jean, de Verdun1
- Jesuit drama, Latin (Medieval and modern)1
- Jewish Rebellion (66-73 A.D.)1
- Jewish diaspora1
- Jewish law1
- Jewish magic1
- Jewish philosophy1
- Jewish religious poetry1
- Jews--Persecutions1
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- Joachim, Saint1
- Joannes de Caligariis1
- John II, King of Portugal, 1455-14951
- John VIII Palaeologus, Emperor of the East, 1392-14481
- John, the Baptist, Saint1
- Joseph (Son of Jacob)1
- Judaism--Roman rite1