| AAB | Army Air Base |
|---|---|
| AAM | American Association of Museums |
| AAO | Amino Acid Oxidase (skr.) |
| AAR | Alliance for Aging Research |
| AAS | Aging and Adult Services |
| AAS | Airport Advisory Service |
| AAS | All-America Selections |
| AAS | Alliance of AIDS Services (skr.) |
| AAS | American Auto Service |
| AAS | Asociación Argentina de Sedimentología |