The Serviço de Informações de Segurança or SIS (Portuguese for: Security Information Service) is the Portuguese security agency and intelligence agency founded in 1984 that specialized in clandestine and covert operation, counterintelligence, counterterrorism, cybersecurity, HUMINT, intelligence assessment, and SIGINT.

[1] The function of SIS is to guarantee the internal security and prevent assassination of a high-ranking official, cyber attacks, espionage, insurgency, sabotage, terrorism, and the practice of acts which, by their nature, can change or destroy the Rule of Law as constitutionally established.

[2] This Portugal-related article is a stub.

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