AOU may refer to:
- American Ornithological Society, formerly the American Ornithologists' Union
- Apparent oxygen utilisation
- Arab Open University, private university
- Aou (trigraph)
- Age of Ultron, a 2013 series published by Marvel Comics
- Avengers: Age of Ultron, a 2015 superhero film of the same name by Marvel Studios
This disambiguation page lists articles associated with the title AOU.
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