- House of Burgundy, 1384-14771
- House of Valois, 1328-15891
- Household employees1
- Huguenots1
- Human anatomy1
- Human reproduction1
- Humorous poetry, German1
- Hydrology1
- Hygiene1
- Hymns, Ethiopic1
- Hypothesis1
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjiz1
- Iceland1
- Ildephonsus, Saint, approximately 610-6671
- Ildobrandini, Geronimo1
- Illumination of books and manuscripts, Flemish1
- Illumination of books and manuscripts, French1
- Illumination of books and manuscripts, Gothic1
- Illumination of books and manuscripts, Medieval1
- Illumination of books and manuscripts, Renaissance1