Encyclopedias, Almanacs, Transcripts, and Maps
- Isopoda (Pillbugs, Slaters, and Woodlice)
- Isoptera (Termites)
- Israeli-Palestinian Accord
- Israelite Law
- Israelite Law: An Overview
- Israelite Law: Criminal Law
- Israelite Law: Personal Status and Family Law
- Israelite Law: Property Law
- Israelite Law: State and Judiciary Law
- Israelite Religion
- Isserles, Mosheh
- Īśvara
- italics
- IUCN—The World Conservation Union
- Iupiter Dolichenus
- IVF
- Ivory-Billed Woodpecker
- Izaak Walton League
- Iʿjāz
- jabiru