Encyclopedias, Almanacs, Transcripts, and Maps
- Infrastructure Protection Center (NIPC), United States National
- Ingersoll, Jared (1749–1822)
- Ingraham v. Wright 430 U.S. 651 (1977)
- Inherent Powers
- Initiative (Update)
- INSCOM (United States Army Intelligence and Security Command)
- INSPASS (Immigration and Naturalization Service Passenger Accelerated Service System)
- Inspector General (OIG), Office of the
- Institutional Litigation
- Insular Cases
- Intellectual Property Law and the First Amendment
- Intelligence & Research (INR), United States Bureau of
- Intelligence Agent
- Intelligence and Counterespionage Careers
- Intelligence and Democracy: Issues and Conflicts
- Intelligence and International Law
- Intelligence and Law Enforcement Agencies
- Intelligence Authorization Acts, United States Congress
- Intelligence Community
- Intelligence Literature