Encyclopedias, Almanacs, Transcripts, and Maps
- Introduction
- Introduction to the Seventh Edition
- Investiture Struggle
- Involuntarity
- Ioannina
- Iona (Hy), Abbey of
- Ionesco, Eugéne
- Iosifescu, Silvian
- Iowa, Catholic Church in
- Ippen Chishin
- Iqbal, Muhammad (C. 1877–1938)
- Iquitos
- Ir Ha-Nidda?at
- Ir-Nahash
- Ir?q?, Eleazar ben Aaron Ha-Kohen°
- Ir?q?, Shalom Ha-Kohen
- Iran, Islamic Republic of
- Iran, The Catholic Church in
- Iraq, The Catholic Church in
- Irbil