- Ibn Ḥijjah al-Ḥamawī, Taqī al-Dīn Abū Bakr ibn ʻAlī, -1434. Badīʻīyat1
- Ildobrandini, Geronimo1
- Illegible markings1
- Illinois--Chicago58
- Illumination of books and manuscripts37
- Illumination of books and manuscripts, Dutch1
- Illumination of books and manuscripts, Flemish3
- Illumination of books and manuscripts, French4
- Illumination of books and manuscripts, Gothic20
- Illumination of books and manuscripts, Italian6
- Illumination of books and manuscripts, Medieval4
- Illumination of books and manuscripts, Renaissance2
- Illustrated works5
- Immortality1
- Implicits (documents)2
- Incunabula2
- Indexes1
- Indulgences3
- Indulgences (Canon law)1
- Inheritance and succession21