AOU may refer to:
* American Ornithologists' Union, former name of
American Ornithological Society
The American Ornithological Society (AOS) is an ornithological organization based in the United States. The society was formed in October 2016 by the merger of the American Ornithologists' Union (AOU) and the Cooper Ornithological Society. Its ...
*
Apparent oxygen utilisation
*
Arab Open University
Arab Open University (AOU) () is a non-profit university system in the Arab world. Headquartered in Kuwait, the system is composed of 16 campuses across 9 countries: Ardiya in Kuwait, Riyadh, Jeddah, Dammam, Madinah, Ḥail, Al-Ahsa in Saudi A ...
, private university
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Aou (trigraph)
* ''
Age of Ultron
"Age of Ultron" (abbreviated AU) is a 2013 comic book fictional crossover storyline published by Marvel Comics that involved the conquest of the Earth by the sentient robot tyrant Ultron. The storyline consisted of an eponymous, 10-issue core ...
'', a 2013 series published by Marvel Comics
**''
Avengers: Age of Ultron'', a 2015 superhero film of the same name by Marvel Studios
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