| AAWCCS | Army Atomic Weapons Systems Safety Committee | |
| ABNM | American Board of Nuclear Medicine | |
| AGHCF | Alpha-Gamma Hot Cell Facility | |
| AGNES | Anti Gravity Nuclear Earth Station | |
| AGNES | Anti Gravity Nuclear Energy Supply | |
| ANA | Auto Nuclear Antibodies | |
| ANA | Anti Nuclear Antibody | |
| ANAC | Auckland Nuclear Accessory Company | |
| ANAL | Aft Nuclear Accident Locker | |
| ANBP | Asia Nuclear Business Platform | |
| ANF | Atlantic Nuclear Force | |
| ANMR | Acoustic Nuclear Magnetic Resonance | |
| ANNT | Anti nuclear Northern Territory | |
| ANO | Arkansas Nuclear One | |
| ANPC | Applied Nuclear Physics Conference | |
| ANPL | Alquds Nuclear Physics Laboratory | |
| ANPP | Arizona Nuclear Power Project | |
| ANPP | Armenian Nuclear Power Plant | |
| ANPP | Army Nuclear Power Program | |
| ANWA | Advanced Nuclear Weapons Alliance | |
| ANWP | Active Nuclear Weapons Products | |
| AOP | Abnormal Operating Procedure | |
| ARNS | Annual Review of Nuclear Science | |
| ARRS | Airborne Radioactivity Removal System | |
| ASNC | American Society of Nuclear Cardiology | |
