President of the United States (Executive Command and Control of Intelligence Agencies)

Pretty Good Privacy (PGP)

Privacy: Legal and Ethical Issues

Profiling

Propaganda, Uses and Psychology

Pseudoscience Intelligence Studies

Psychotropic Drugs

Public Health Service (PHS), United States

Pueblo Incident

Purple Machine

Quantum Physics: Applications to Espionage, Intelligence, and Security Issues

RADAR

RADAR, Synthetic Aperture

Radiation, Biological Damage

Radio Direction Finding Equipment

Radio Frequency (RF) Weapons

Radioactive Waste Storage

Radiological Emergency Response Plan, United States Federal

Reagan Administration (1981–1989), United States National Security Policy

Real IRA (RIRA)

Reconnaissance

Red Code

Red Hand Defenders (RHD)

Red Orchestra

Remote Sensing

Retina and Iris Scans

Revolutionary Armed Forces of Colombia (FARC)

Revolutionary Nuclei

Revolutionary Organization 17 November (17 November)

Revolutionary People's Liberation Party/Front (DHKP/C)