Security Service

Security Service or security service may refer to:

Government

 * Security agency, a nation's institution for intelligence gathering
 * List of security agencies (MI5, NSA, KGB, etc.)
 * Sicherheitsdienst (SD), Nazi German agency which translates as "Security Service"
 * MI5, also called the Security Service, the United Kingdom's counter-intelligence and security agency
 * U.S. Air Force Security Service, a former designation of the US Air Force Intelligence, Surveillance and Reconnaissance Agency
 * RCMP Security Service, the Royal Canadian Mounted Police's political intelligence branch
 * Swedish Security Service
 * Secret service, a government agency concerned with gathering intelligence data
 * Secret police, a police agency beyond the law to protect the political power of a dictator or regime

Other

 * Security service (telecommunication), security architecture for the interconnection of open systems
 * Security and Intelligence Services (India)
 * Private security company
 * Private military company