- James, the Greater, Saint1
- Jerónima de la Asunción, madre, 1555-16301
- Jesuit drama, Spanish1
- Jesuits2
- Jewish astronomy2
- Jewish funeral rites and ceremonies1
- Jewish law1
- Jewish mourning customs1
- Jewish religious poetry, Ladino1
- Jewish sermons, Hebrew2
- Jews5
- Jews--Medicine1
- Jews--Persecutions1
- Jiménez de Cisneros, Francisco, 1436?-15171
- John II, King of Aragon, 1397-14791
- John the Baptist's Day1
- Juana, la Loca, Queen of Castile, 1479-15551
- Juana, of Austria, Princess of Portugal, 1535-15731
- Jugurthine War (111-105 B.C.)1
- Justa, Saint, -approximately 2871