- Ibn ʻAqīl, ʻAbd Allāh ibn ʻAbd al-Raḥmān, 1294?-1367. Sharḥ al-Alfīyah1
- Ibn Ḥajar al-ʻAsqalānī, Aḥmad ibn ʻAlī, 1372-1449. Tahdhīb al-Tahdhīb.--Abridgment1
- Ibn Ḥijjah al-Ḥamawī, Taqī al-Dīn Abū Bakr ibn ʻAlī, -1434. Badīʻīyah1
- Ibn Ḥijjah al-Ḥamawī, Taqī al-Dīn Abū Bakr ibn ʻAlī, -1434. Badīʻīyat1
- Ildobrandini, Geronimo1
- Illegible markings1
- Illinois--Chicago55
- Illumination of books and manuscripts28
- Illumination of books and manuscripts, Flemish3
- Illumination of books and manuscripts, French3
- Illumination of books and manuscripts, Gothic12
- Illumination of books and manuscripts, Italian5
- Illumination of books and manuscripts, Medieval2
- Illumination of books and manuscripts, Renaissance1
- Illustrated works4
- Immortality1
- Implicits (documents)2
- Incunabula2
- Indexes1
- Indulgences3