- Ibn Ḥijjah al-Ḥamawī, Taqī al-Dīn Abū Bakr ibn ʻAlī, -1434. Badīʻīyah1
- Ildobrandini, Geronimo1
- Illinois--Chicago1
- Illumination of books and manuscripts, French1
- Illumination of books and manuscripts, Italian1
- Incunabula1
- Indulgences (Canon law)1
- Inheritance and succession (Canon law)1
- Inheritance and succession (Roman law)1
- Innocent VIII, Pope, 1432-14921
- Insertions (Production)1
- Interdict (Canon law)1
- Interest (Islamic law)1
- International trade1
- Ireland1
- Isabella I, Queen of Spain, 1451-15041
- Isaiah (Biblical prophet)1
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Lubāb al-iʻrāb1
- Islam and philosophy1
- Islam--Prayers and devotions1