- Human anatomy1
- Humanism1
- Humorous poetry, German1
- Hybrid books1
- Hymns, Latin1
- Ibn Yūsuf al-Ṣafī, Muḥammad, 1421-14871
- Ibn al-Jarādiqī, Muḥammad ibn ʻAlī, approximately 1373-14571
- Ibn al-Murtaḍá, Aḥmad ibn Yaḥyá, 1363-1437. Miʻyār al-ʻuqūl fī ʻilm al-uṣūl1
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjiz1
- Ibn al-Sāʻātī, Aḥmad ibn ʻAlī, 1254-1294 or 1295. Badīʻ al-niẓām al-jāmiʻ bayna Kitāb al-Bazdawī wa-al-aḥkām1
- Ibn ʻUmrān, Muḥammad ibn Mūsá, 1392-14691
- Illumination of books and manuscripts, Italian1
- Illustrated works1
- Indulgences1
- Ink1
- Ink stamps1
- Interdict (Canon law)1
- Ireland1
- Isabella I, Queen of Spain, 1451-15041
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Lubāb al-iʻrāb1