- John II, King of Portugal, 1455-14951
- 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, King of England, 1167-12161
- John, of Daylam1
- John, the Apostle, Saint3
- John, the Apostle, Saint--Illustrations1
- John, the Baptist, Saint1
- Jonah (Biblical prophet)1
- Joseph (Son of Jacob)2
- Juana, of Austria, Princess of Portugal, 1535-15732
- Judaism5
- Judaism (Christian theology)1
- Judaism--Controversial literature4
- Judaism--Liturgy2
- Judaism--Liturgy--Texts3
- Judaism--Prayers and devotions1
- Judaism--Roman rite1