- Grace (Theology)1
- Graduals (Chants)1
- Hadith (Shiites)1
- Hilarion, Saint, approximately 291-approximately 3711
- Hindu legends1
- Historical geography1
- History of Biblical events1
- History, Military1
- Horace1
- Horses1
- Horses--Diseases1
- Humanism1
- Hymns, Latin (Medieval and modern)1
- Ibn Amīn al-Dawlah, al-ʻAfīf, active 15th century. Lamḥah al-ʻAfīfīyah fī al-ṭibb1
- Ibn Saʻādah, Aḥmad ibn ʻAlī, active 13th century. Risālat al-ʻilm1
- Ibn al-Biṭrīq, Yūḥannā, -approximately 8151
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjaz fī al-ṭibb1
- Ijtihād (Islamic law)1
- Illumination of books and manuscripts, Gothic1
- Illumination of books and manuscripts, Italian1