- Jewish diaspora1
- Jewish ethics1
- Jewish magic1
- Jewish travelers1
- Jews--Dietary laws1
- Jiménez de Cisneros, Francisco, 1436?-15171
- John I, King of Portugal, 1357-14331
- 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
- Joseph (Son of Jacob)1
- Judaism1
- Judaism--Ari rite1
- Judaism--Prayers and devotions1
- Judeo-Arabic language1
- Judeo-Persian language1
- Judgment Day (Islam)1
- Julius III, Pope, 1487-15551