- Forgery of manuscripts1
- Four elements (Philosophy)1
- Future life--Islam1
- Gautama Buddha1
- Geodesy1
- Geomancy1
- Groundwater1
- Hadith--Commentaries1
- Hermetism1
- Human anatomy1
- Hydraulic structures1
- Hydrostatics1
- Hymns, Samaritan Aramaic1
- Ibn Ghāzī, Muḥammad ibn Aḥmad, 1437 or 1438-1513. Munyat al-ḥussāb1
- Ibn Hishām, ʻAbd Allāh ibn Yūsuf, 1309-1360. Awḍaḥ al-masālik li-Alfīyat Ibn Mālik1
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjiz1
- Ibn Ḥijjah al-Ḥamawī, Taqī al-Dīn Abū Bakr ibn ʻAlī, -1434. Badīʻīyah1
- Illumination of books and manuscripts, Iranian1
- Inheritance and succession (Islamic law)1
- Inlays1