- Illinois--Chicago10
- Illumination of books and manuscripts36
- Illumination of books and manuscripts, Dutch1
- Illumination of books and manuscripts, Flemish1
- Illumination of books and manuscripts, French4
- Illumination of books and manuscripts, German1
- Illumination of books and manuscripts, Gothic23
- Illumination of books and manuscripts, Italian3
- Illumination of books and manuscripts, Medieval6
- Illumination of books and manuscripts, Renaissance5
- Illustrated works5
- In Coena Domini bulls1
- Incarnation1
- Indians of Mexico--Missions1
- Indians of Mexico--Religion1
- Indulgences1
- Indulgences (Canon law)1
- Initials4
- Inner Light1
- Innocent VIII, Pope, 1432-14921