SAO

Sao may refer to:

• Sao language, an aboriginal language of Taiwan
• Sao, Burkina Faso
• The Sao civilisation who lived south of Lake Chad
• The Sáo, a bamboo transverse flute used in Vietnam
• Sao (moon) of Neptune
• Sao, one of the Nereids
• São, the Portuguese word for saint. It is also a common abbreviation of the given name Conceição.
• SAO biscuits, produced by Arnott's
• Sao (trilobite), a genus of ptychopariid trilobite
• Sao, nickname of the Chad national football team
• Ligi Sao (born 1992), New Zealand Rugby League player

SAO or S.A.O. may stand for:

• Saco Transportation Center (Amtrak station code SAO), a train station in Saco, Maine, United States
• Session-At-Once, a recording mode for optical discs.
• Smithsonian Astrophysical Observatory of the Smithsonian Institution in Cambridge, Massachusetts
• Smithsonian Astrophysical Observatory Star Catalog
• Special Astrophysical Observatory of the Russian Academy of Science, the site of the BTA-6 Telescope, which for many years was the world's largest telescope
• Security Advisory Opinion, a decision-making process used by the US Department of State and United States embassies to grant or deny United States visas
• Specified Associated Organisation in the United Kingdom is an organization of members within the Liberal Democrats formed around a specific trait
• SAO, the ICAO airline designator for the Sahel Aviation Service airline
• SAO, the IATA airport code for airports in the São Paulo Metropolitan Area, Brazil
• Sword Art Online, Japanese light novel, manga and anime series by Reki Kawahara.
• Shin Angyō Onshi, manga-manhwa and animated film created by Youn In-wan and illustrated by Yang Kyung-il.