The Federal Protective Service (FPS) is a federal law enforcement agency of the United States Department of Homeland Security (DHS). It is also "the federal agency charged with protecting and delivering integrated law enforcement and security services to facilities owned or leased by the General Services Administration (GSA)"—over 9,000 buildings—and their occupants.

Security police usually describes a law enforcement agency which focuses primarily on providing security and law enforcement services to particular areas or specific properties. They may be employed by governmental, public, or private institutions. Security police are generally considered distinct from security guards as security police personnel typically hold some level of law enforcement authority. The exact powers held by security police vary widely between jurisdictions. Examples of these types of agencies include the U.S. FBI Police, the Indian Central Industrial Security Force, and the British Civil Nuclear Constabulary.