SSO

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
 * Society of Surgical Oncology

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

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.