| Abbreviation | Definition |
|---|---|
| ASA | American Society of Anesthesiologists |
| ASA | American Statistical Association |
| ASA | AminoSalicylic Acid |
| ASAP | Administrative Systems Automation Project |
| ASAS | American Society of Animal Science |
| ASB | Accounting Services Branch |
| ASB | Administrative Services Branch |
| ASB(OC) | Accounting Services Branch (OC) |
| ASC | Advertising Standards Council |
| ASCII | American Standard Code for Information Interchange |
| ASCO | American Society of Clinical Oncology |
| ASCP | American Society for Clinical Pathology |
| ASCPT | American Society for Clinical Pharmacology and Therapeutics |
| ASCVD | AtheroSclerotic Cardio-Vascular Disease |
| ASD | Atrial Septal Defect |
| ASD(HD) | Assistant Secretary of Defense for Homeland Defense |
| ASGE | American Society for Gastrointestinal Endoscopy |
| ASHD | AtheroSclerotic Heart Disease |
| ASHRAE | American Society of Heating, Refrigeration & Air Conditioning Engineers |
| ASHRAE | American Society of Heating, Refrigeration, & Air Conditioning Engineers |