| Acronym | Definition |
|---|
| ASU | Arizona State University (Tempe, AZ) |
| ASU | Appalachian State University |
| ASU | Arkansas State University |
| ASU | Angelo State University |
| ASU | Alabama State University |
| ASU | Australian Services Union |
| ASU | Alcorn State University (Mississippi, USA) |
| ASU | Accident Sickness and Unemployment (insurance) |
| ASU | Albany State University |
| ASU | Air Separation Unit |
| ASU | Aklan State University (Banga, Aklan, Philippines) |
| ASU | Asian Student Union |
| ASU | Aikido Schools of Ueshiba |
| ASU | Avocado-Soybean Unsaponifiables (nutrition supplement) |
| ASU | Athens State University (Athens, AL) |
| ASU | Athens State University (Athens, Alabama, USA) |
| ASU | Ain Shams University |
| ASU | African Student Union |
| ASU | Applied Science University (Amman, Jordan) |
| ASU | Abgassonderuntersuchung (German: fume emission test) |
| ASU | American Sentinel University (Aurora, CO) |
| ASU | Air Support Unit |
| ASU | Active Service Unit |
| ASU | Army Service Uniform |
| ASU | Asuncion, Paraguay - Silvio Pettirossi (Airport Code) |
| ASU | Asynchron-Synchron Umsetzer |
| ASU | Ambulatory Surgical Unit |
| ASU | Airport Security Unit (Hong Kong Special Police Forces) |
| ASU | Amateur Speedskating Union |
| ASU | Anti-Smuggling Unit |
| ASU | Aircraft Sector Understanding |
| ASU | Animal Services Unit (various locations) |
| ASU | Administrative Segregation Unit |
| ASU | Automatic Speech Understanding (interface technology) |
| ASU | Approval for Service Use |
| ASU | Analog Service Unit |
| ASU | American Students Union |
| ASU | Antisurface Warfare |
| ASU | Akron State University (Ohio) |
| ASU | Adventure Sports Unlimited (California) |
| ASU | Antenna Switch Unit |
| ASU | Antenna Switching Unit |
| ASU | ATM Service Unit |
| ASU | Adder-Subtractor Unit |
| ASU | Alarm Supervisory Unit |
| ASU | Automatic Switch Unit |
| ASU | Atomsicherer Unterstand (German) |
| ASU | Automatic Synchronization Unit |
| ASU | Airstream Sensing Unit |
| ASU | Approval/Approved for Service Use |
| ASU | Automatic Signaling Unit |