AOU may refer to:
- American Ornithologists' Union, former name of American Ornithological Society
- 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.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: