:Sao

• Sao civilisation, in Middle Africa from 6th century BC to 16th century AD
• Sao, a town in Boussé Department, Burkina Faso
• Serb Autonomous Regions (Srpska autonomna oblast, SAO), during the breakup of Yugoslavia

• Smithsonian Astrophysical Observatory of the Smithsonian Institution in Cambridge, Massachusetts, U.S.
• Smithsonian Astrophysical Observatory Star Catalog, which assigns SAO catalogue entries
• Special Astrophysical Observatory of the Russian Academy of Science (SAO RAS)
• Session-At-Once, a recording mode for optical discs

• Saco Transportation Center, a train station in Saco, Maine, U.S., station code SAO
• Sahel Aviation Service, Mali, ICAO airline code SAO
• Airports in Greater São Paulo, Brazil, IATA airport code SAO

• Ligi Sao (born 1992), a Samoan rugby league player
• Ron Sao, Western Australian politician

• Sao (moon), a satellite of Neptune
• Sao (mythology), a sea nymph in Greek mythology
• Sao, or Thao language, of the Thao people in central Taiwan
• Sao (စဝ်), an honorific in Burmese names
• SAO (biscuit), an Australian savoury cracker
• Chad national football team, nicknamed Les Sao
• Security Advisory Opinion, a U.S. visa decision-making process
• Specified Associated Organisation, of the British Liberal Democrats
• Sword Art Online, a Japanese light novel series, and manga, anime, film and video game adaptations
• Sao hirsuta, a species of trilobite

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• Sau (disambiguation)
• Sao Sao Sao, a Thai pop music trio
• São Paulo, the largest city in Brazil
• São Tomé and Príncipe, a country

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