| Acronym | Definition |
|---|
| AOU | Arab Open University (Saudi Arabia) |
| AOU | American Ornithologists' Union |
| AOU | Agreement of Understanding (contracts; various organizations) |
| AOU | Air Operations Unit |
| AOU | American Ornithological Union |
| AOU | Apparent Oxygen Utilization |
| AOU | American Open University |
| AOU | Area Of Uncertainty |
| AOU | Arithmetic Output Unit |
| AOU | Azimuth Orientation Unit |
| AOU | Acronym Over-Usage |
| AOU | Alliance for Ontario Universities |
| AOU | Aviation Ordnanceman Utility (US Navy rank) |
| AOU | Approved for Operational Use |
