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