AO
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AO may stand for:
- Aosta Valley (Vallée d'Aoste, Valle d'Aosta), abbreviation for the region and province of Italy
- Oiler, US Navy hull classification symbol (AO)
- Adults Only, contents rated not suitable for people under 18 by Entertainment Software Rating Board
- Anarchy Online, a science fiction Massive(ly) multiplayer online role-playing game
- the ISO 3166-1 alpha-2 country code for Angola
- the IATA code for Australian Airlines
- Arctic oscillation
- The postnominal letters of an Officer of the Order of Australia
See also: A0 (A-zero)
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