- Hieron I, Tyrant of Syracuse, -467 B.C. or 466 B.C.1
- Hieronymites4
- Hilarion, Saint, approximately 291-approximately 3711
- Historia de regibus Gothorum, Vandalorum, et Suevorum (Isidore, of Seville, Saint)1
- Historiated initials151
- Historiography1
- History462
- History of Biblical events7
- History, Ancient6
- History, Military1
- History--Religious aspects2
- History--Sources4
- Hoccleve, Thomas, 1370?-1450?3
- Holy Shroud1
- Holy Spirit1
- Holy Week services1
- Homage (Feudal law)1
- Horoscopes1
- Horses--Diseases1
- Horticulture1