- Italy--Tuscany1
- Italy--Veneto1
- Italy--Vicenza1
- Jainism1
- Jawī Zādah, Muḥammad ibn Ilyās, -1547 or 1548. Risālah fī al-masḥ ʻalá al-khuffayn1
- Jesuit drama, Latin (Medieval and modern)1
- 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, King of England, 1167-12161
- John, the Apostle, Saint1
- Joseph (Son of Jacob)1
- Judaism--Ari rite1
- Judaism--Liturgy1
- Judaism--Prayers and devotions1