Encyclopedias, Almanacs, Transcripts, and Maps
- insulin shock
- Insurance—Those With and Those Without
- Integrated Ocean Drilling Program
- Intelsat
- Intentional Communities
- Inter-American Conferences
- intercontinental ballistic missile
- Interfaith Marriage
- Intergenerational Programming
- Intergenerational Relations
- Interior, United States Department of the
- Interlingua
- intermediate range ballistic missile
- intermediate school
- intermolecular forces
- International Brotherhood of Teamsters, Chauffeurs, Warehousemen, and Helpers of America
- International Campaign to Ban Landmines
- International Center for Settlement of Investment Disputes
- International Civil Aviation Organization
- International Committee of the Red Cross