| Acronym | Definition |
|---|
| AAU | Amateur Athletic Union |
| AAU | Aalborg University |
| AAU | Academy of Art University (San Francisco, CA) |
| AAU | Association of American Universities |
| AAU | Addis Ababa University (Ethiopia) |
| AAU | Association of African Universities |
| AAU | Assigned Amount Unit |
| AAU | Arab Association of Urology |
| AAU | Ambrose Alli University (Ekpoma, Nigeria) |
| AAU | American Athletic Union |
| AAU | Administrative Appeals Unit |
| AAU | Acute Assessment Unit (various hospitals; UK) |
| AAU | Acute Anterior Uveitis (eye disorder) |
| AAU | Asian Americans United |
| AAU | Association of Atlantic Universities (Canada) |
| AAU | American Art-Union (est. 1840) |
| AAU | Associated Aviation Underwriters |
| AAU | Acute Admissions Unit |
| AAU | Assam Agriculture University (India) |
| AAU | Association of Aerospace Universities |
| AAU | Airport Admin Utility (software) |
| AAU | Air Ambulance Unit |
| AAU | Attitude, Awareness & Usage (marketing) |
| AAU | Artists Among Us |
| AAU | Association of Arab Universities |
| AAU | Alpha Acid Unit |
| AAU | Allied American Underwriters (El Segundo, CA) |
| AAU | analog applique unit |
| AAU | Automatic Answering Unit |
| AAU | Awareness, Attitude & Usage |
| AAU | Announcement Amplifier Unit |
| AAU | Acoustic Add-On Unit |
| AAU | Association Assurance Universelle (French: Universal Insurance Association) |
| AAU | Automatic Answer Unit |
| AAU | Applicant Add Update |
| AAU | Asynchronous Attachment Unit |