AO, aO, Ao, or ao may refer to:

Places

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Arts and entertainment

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Businesses and organizations

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  • AO (originally American Optical Company) eyeglass lenses, a brand now merged with Carl Zeiss Vision
  • AO Foundation (originally Arbeitsgemeinschaft für Osteosynthesefragen), a non-profit organisation dedicated to the treatment of trauma and disorders of the musculoskeletal system
  • AO Racing, an American sports car racing team
  • AO World, a UK retailer of household appliances trading under the brand name ao.com
  • Aktsionernoye Obschestvo or Aktsionernoye Obshchestvo (акционерное общество), a type of Russian corporate entity; see open joint-stock company
  • Athletics Ontario, formally Ontario Track and Field Association (OTAF)
  • Australian Airlines (IATA code AO)

Government and politics

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Military

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Philosophy and religion

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Science and technology

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Surnames and initials

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  • Ao (surname) (), a Chinese surname
  • Ou (surname) (/ and /), romanized as Ao in Cantonese
  • Ao Omae (大前 粟生, Ōmae Ao, born 1992), Japanese fiction writer
  • Aaron Owens (born 1976), American streetball player

Other uses

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See also

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