- Hippocrates1
- Historia animalium (Aristotle)1
- Historiography1
- Homiliaries1
- Horses--Diseases1
- Hungary1
- Hygiene1
- Hymns1
- Hārūn al-Rashīd, Caliph, approximately 763-8091
- Ibn Taymīyah, ʻAbd al-Salām ibn ʻAbd Allāh, 1193 or 1194-1254 or 1255. Muḥarrar fī al-fiqh1
- Ibn al-Bārizī, Hibat Allāh ibn Najm al-Dīn, 1247-13381
- Ibn al-Sāʻātī, Aḥmad ibn ʻAlī, 1254-1294 or 5. Majmaʻ al-baḥrayn wa-multaqá al-nayyirayn1
- Ikmāl (Ibn Mākūlā, ʻAlī ibn Hibat Allāh)1
- Illegitimacy1
- Illumination of books and manuscripts, Italian1
- Illumination of books and manuscripts, Medieval1
- Incarnation1
- Inheritance and succession1
- Intellectual life1
- Iran--Iṣfahān1