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Sia (disambiguation)

Last updated January 27, 2026

Sia (born 1975) is an Australian singer and songwriter.

Safety Investigation Authority, a Finnish national board for incident investigation
Secret Intelligence Australia, a British World War II intelligence unit
Security Industry Association, for makers and handlers of electronic and physical security products
Security Industry Authority, a British licensing authority for the private-security industry
Securities Industry Association, in finance
Semiconductor Industry Association
Smithsonian Institution Archives
Societe Internationale d’Acupuncture, a defunct French research organization
Society for Industrial Archeology, a North American nonprofit organization
Solidaridad Internacional Antifascista, a Spanish anarchist humanitarian organisation that existed during the Spanish Civil War
Staten Island Academy, a US school
Survivors of Incest Anonymous
Service d'information aéronautique, the French Aeronautical Information Service

Service in Informatics and Analysis, provided batch and remote terminal access to mainframe computers, from 1967 to the early 1990s
SIA Ltd, suppliers of geographic information software and services
SOCO International (London stock exchange symbol SIA), an international oil and gas exploration and production company
Sia Partners, a management consulting firm
SIA S.p.A., an Italian information and communications technology company

Società Italiana Aviazione, a subsidiary of Fiat that built aircraft and aero engines between 1914 and 1918
Subaru of Indiana Automotive, Inc., formerly Subaru-Isuzu Automotive, Inc.
Seychelles International Airways, a former charter airline
Singapore Airlines (ICAO code: SIA)

Sia Berkeley (born 1985), English actress
Sia Figiel (1967–2026), Samoan novelist, poet and painter
Sia Koroma (born 1958), Sierra Leonean biochemist and psychiatric nurse; wife of Sierra Leonean President Ernest Bai Koroma
Beau Sia (born 1976), American slam poet
Edgar Sia (born 1977), Filipino billionaire property developer