| Agency Name: | Security Information Service |
| Nativename: | Serviço de Informações de Segurança |
| Type: | Secret Service & Intelligence Agency (Internal and External Operations) |
| Formed: | 1984 |
| Headquarters: | Lisbon |
| Minister1 Name: | Luís Montenegro |
| Minister1 Pfo: | Prime Minister |
| Chief1 Name: | Adélio Neiva da Cruz |
| Chief1 Position: | Director of the SIS |
| Agency Type: | Intelligence service |
| Parent Agency: | Sistema de Informações da República Portuguesa (SIRP) |
| Website: | www.sis.pt |
The Serviço de Informações de Segurança or SIS (Portuguese for: Security Information Service) is the Portuguese Security and Secret Service agency founded in 1984.[1]
The function of SIS is to guarantee the internal security and prevent cyber attacks, sabotage, terrorism, espionage and the practice of acts which, by their nature, can change or destroy the Rule of Law as constitutionally established.[2]