- Jewish philosophy1
- Jewish religious poetry1
- Jews--Persecutions1
- Jiří, z Poděbrad, King of Bohemia, 1420-14711
- Joannes de Caligariis1
- John VIII Palaeologus, Emperor of the East, 1392-14481
- John, the Baptist, Saint1
- Joseph (Son of Jacob)1
- Judaism--Roman rite1
- Judaism--Roman rite--Liturgy1
- Judgment Day1
- Julius III, Pope, 1487-15551
- János I Zápolya, King of Hungary, 1487-15401
- Jābir ibn Ḥayyān1
- Kings and rulers--Heraldry1
- Kirchmair, Georg, 1481-15541
- Knowledge, Theory of1
- Kölner Dom1
- Labyrinths1
- Ladino language1