Other Uses
- Ao (color)
- Ao (mythology), a deity in Māori mythology
- Ao (turtle), a creature in Chinese mythology
- Ao Naga, an Indian ethnic group
- Ao languages
- Aaron Owens (born 1976), American streetball player
- Area of operations, a U.S. military term
- Australian Airlines, IATA code AO
- AO, Alpha and Omega (abbreviation)
- Ao, an ancient Polynesian word for light or daytime
- Ao, a type of Easter Island wood carving
- AO, a U.S. Navy hull classification symbol for an oiler
- AO-, the prefix for several firearms
- Aktsionernoye obschestvo, a Russian corporate entity similar to a joint-stock company
- Aviation Ordnanceman, a United States Navy occupational rating
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