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

Arts and entertainment

Businesses and organizations

  • 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 World, a UK retailer of household appliances trading under the brand name
  • 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


Philosophy and religion

Science and technology

Surnames and initials

Other uses

See also

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