SSO

• 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 Spetsial'nykh Operatsiy)
• SSO ZSU, Ukrainian Special Operations Forces (Syly Spetsialʹnykh Operatsiy)
• SSO, Belarusian Special Operations Forces
• Society of Surgical Oncology

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• 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

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• 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

• 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

• 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

• Simultaneous switching output, also known as simultaneous switching noise (SSN), or ground bounce

• Siding Spring Observatory, an astronomical observatory in Australia
• Solar System Object

• 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.
• Subsynchronous oscillations in an electrical grid

• 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

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