- Hecuba, Queen of Troy1
- Henry III, King of France, 1551-15891
- Henry VI, King of England, 1421-14711
- Hercules (Roman mythological character)1
- Hieronymites1
- History1
- History, Ancient1
- Holy Shroud1
- Household employees1
- Hugh, of Cluny, Saint, 1024-11091
- Huguenots1
- Hundred Years' War (1339-1453)1
- Hungary1
- Hussites1
- Hydrology1
- Ibn Nawbakht, Ibrāhīm, active 10th century. Yāqūt fī ʻilm al-kalām1
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjiz al-Qānūn1
- Ibn al-ʻImād al-Aqfahsī, Aḥmad, approximately 1349-1405. Manẓūmah fī al-najāsāt al-maʻfū ʻanhā1
- Incarnation1
- Inglis, Esther, 1571-16241