SSO may refer to: Organizations Sarasota County Sheriff's Office, a law enforcement agency in Sarasota County, Florida, US Social Security Organization, a social welfare organization in Iran Special Security Office, a function to disseminate sensitive information in the US federal government and armed forces Special Security Organization, a former Iraqi security agency Special Source Operations, a division of the US National Security Agency that collects digital data Standards Setting Organization, a group developing, producing or maintaining technical standards SSO VS, Russian Special Operations Forces (Sily Spetsialnykh Operatsiy) SSO, Ukrainian Special Operations Forces (Syly Sspetsialʹnykh Operatsiy) SSO, Belarusian Special Operations Forces Orchestras Salford Symphony Orchestra, England Saskatoon Symphony Orchestra, Canada Scottish Symphony Orchestra, Scotland Seattle Symphony Orchestra, US Shreveport Symphony Orchestra, US Singapore Symphony Orchestra, Singapore Southern Syncopated Orchestra, an early US jazz group that toured the UK and Ireland 1919–21 Springfield Symphony Orchestra, US Stavanger Symphony Orchestra, Norway Sudbury Symphony Orchestra, Canada Sydney Symphony Orchestra, Australia Syracuse Symphony Orchestra, US Arts and entertainment Starship Operators, a Japanese sci-fi novel and anime television series Super Surgical Operation, a Japanese video game also known as Trauma Center: Under the Knife Science and technology Spaceflight Scaled Composites SpaceShipOne, the vehicle used in the first privately funded human spaceflight Semi-synchronous orbit, a type of orbit Single-stage-to-orbit, a reusable vehicle that reaches space without jettisoning hardware Space Shuttle Orbiter, a reusable space vehicle formerly operated by NASA Sun-synchronous orbit, a type of orbit Swiss Space Office, national space program of Switzerland Computing Single sign-on, allowing access to multiple software systems using one login Structure, sequence and organization, a US legal term relating to computer programs and copyright Electronics Simultaneous switching output, also known as simultaneous switching noise (SSN), or ground bounce Astronomy Siding Spring Observatory, an astronomical observatory in Australia Solar System Object Other uses Sanitary sewer overflow, when untreated sewage is discharged into the environment Senior station officer (New Zealand Fire Service), a rank in the New Zealand Fire Service Source-separated organics, a system for separating compostable materials from other waste streams Student Switch Off, a UK-based energy saving campaign Sydney Star Observer, an LGBT newspaper in Sydney, Australia South Sudan Oyee!, the national anthem of South Sudan. See also Sso (ethnic group), of southern Cameroon Sso (rite), an initiation rite once practised by the Beti of Cameroon SS0, a postcode in the SS postcode area