Secretaría de Inteligencia (Secretariat of Intelligence, S.I.) is the premier intelligence agency of the Argentine Republic and head of its National Intelligence System.
Chaired by the Secretary of State Intelligence who is a special member of the Cabinet of Ministers, the Secretariat of Intelligence is a technical and operational service charged with the collection and production of intelligence and counterintelligence in internal and foreign areas, as well as the analysis and formation of a national intelligence strategy in order to handle state affairs. The Secretariat is charged with the duty of producing a complete intelligence cycle for the government. Structurally, S.I. has the biggest intelligence gathering capabilities in Argentina, as it counts with numerous delegations within Argentina as well as foreign operational bases and delegations.
Under the law, the Secretariat is subordinated to the Presidency and is ruled by secret decrees and laws. Even though the official acronym was renamed to S.I. as the new intelligence system became active, during most of its history it was called Secretaría de Inteligencia de Estado (Secretariat of State Intelligence, SIDE) and it still is referred to as SIDE by the public.