| Arts Undergraduate Society | Academic & Science |
| Assam University Silchar | Academic & Science |
| American University of Sharjah | Academic & Science |
| Atlantic University Sport | Academic & Science |
| Appalachian University Systems | Academic & Science |
| Academic Unit System | Academic & Science |
| Antioch University Seattle | Academic & Science |
| Aqua Urea Solution | Academic & Science |
| Automated Underwriting System | Business |
| Allied Universal Services | Business |
| Advanced Underwriting Service | Business |
| American United School | Community |
| ARC of the United States | Community |
| American Union State | Community |
| Anonymous Undeniable Signature | Computing |
| Apple User Service | Computing |
| Auto Update Server | Computing |
| Access Units | Computing |
| Application Update Service | General |
| Artificial Urinary Sphincter | General |
| Annual Upgrade and Support | General |
| Always Under Stress | General |
| Associated Utility Supplies | General |
| Aichi Utlity Steel | General |
| Ankh Udja Seneb | General |
| Aarav Unmanned Systems | General |
| Abdominal Ultrasound Suggest | General |
| Allied Universal Security | General |
| Auxiliary Undergraduate Scheme | General |
| ASEAN Undergraduate Scholarship | General |
| Antimicrobial Use and Stewardship | General |
| Audio System | General |
| Automotive Sweepstakes | General |
| Robert Mueller Municipal Airport | Governmental |
| ANUPSHAHR | Indian Railway Station |
| Austin International Airport, Austin, Texas. USA. | International |
| Australaysian | International |
| abbreviations AUS Stands | International |
| Acute Urethral Syndrome | Medical |
| Army of United States | Military and Defence |
| Australian Universal Solider | Military and Defence |
| Australian University Sport | Regional |
| Augusta Southern Railroad | Regional |
| Augusta and Summerville Railroad | Regional |
| Robert Mueller Municipal Airport, Austin, Texas USA | Regional |
| Advanced Upper Stage | Space Science |
| Aarhus Universitets Sport | Sports |
