- Ijtihād (Islamic law)4
- Ildephonsus, Saint, approximately 610-6671
- Ildobrandini, Geronimo1
- Illegitimacy2
- Illinois--Chicago5
- Illumination of books and manuscripts58
- Illumination of books and manuscripts, Carolingian1
- Illumination of books and manuscripts, Ethiopian1
- Illumination of books and manuscripts, Flemish3
- Illumination of books and manuscripts, French5
- Illumination of books and manuscripts, German2
- Illumination of books and manuscripts, Gothic7
- Illumination of books and manuscripts, Indic5
- Illumination of books and manuscripts, Iranian16
- Illumination of books and manuscripts, Italian1
- Illumination of books and manuscripts, Medieval1
- Illumination of books and manuscripts--Technique1
- Illusion (Philosophy)2
- Illustrated works21
- Imaginary letters1