Security Intelligence Service may refer to:
Canadian Security Intelligence Service New Zealand Security Intelligence Service Security And Intelligence Services (India), private security company in India Tiger Organization Security Intelligence Service, Liberation Tigers of Tamil Eelam (Sri Lankan Civil War)
See also Security Service (disambiguation) National Security Service (disambiguation) National Intelligence and Security Service (disambiguation) Secret Intelligence Service, (MI5) Signals Intelligence Service, US Army (WWII) Special Intelligence Service, forerunner of the CIA