Encyclopedias, Almanacs, Transcripts, and Maps
- Irmengard, Bl.
- Irmgardis of Cologne, St.
- Irmhart, Öser
- Irmina, St.
- Irnerius
- Iron Guard
- Irrationalism
- Irving V. Lipstadt
- Irving, Amy
- Irving, Jules°
- Isaac (Isak), Aaron
- Isaac Bar Dorbelo
- Isaac Bar Israel ibn al-Shuwayk
- Isaac Bar Joseph
- Isaac Bar Rav Judah
- Isaac ben Abba Mari of Marseilles
- Isaac ben Abraham
- Isaac ben Abraham
- Isaac ben Abraham di Molina
- Isaac ben Abraham Ha-Gorni