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- National Preparedness Strategy, United States
- National Response Team, United States
- National Security Advisor, United States
- National Security Strategy, United States
- National Security Telecommunications Advisory Committee
- National Telecommunications Information Administration, and Security for the Radio Frequency Spectrum, United States
- National Treasury Employees Union v. Von Raab 489 U.S. 656
- National Unity, Group Conflict, and the Constitution
- Native Hawaiian Sovereignty Movements
- Natural Resources and National Security
- Natural Rights and the Constitution
- NCIX (National Counterintelligence Executive), United States Office of the
- Neal v. Delaware 103 U.S. 370 (1881)
- Near Space Environment
- Near v. Minnesota 283 U.S. 697 (1931)
- Nebbia v. New York 291 U.S. 502 (1934)
- Nebraska Press Association v. Stuart 427 U.S. 539 (1976)
- Necessary and Proper Clause
- Nelson, Samuel (1792–1873)
