| Abbreviation | Definition |
|---|---|
| A.F.&A.M. | Ancient Free and Accepted Masons |
| A1F | Alpha-One Foundation |
| A4L | Abilities For Life |
| A99ID | Associates of the 99th Infantry Division |
| AA | Addictions Anonymous |
| AA | Alcoholics Anonymous |
| AA | Alzheimer's Association |
| AA | American Atheists |
| AAA | Anti-Aircraft Association |
| AAA | Area Agency on Aging |
| AAA | Arrowhead Accountability Association |
| AAA | Australian Automobile Association |
| AAAA | Action Against Ageing Association |
| AAAA | Arizona Asian American Association |
| AAAA | Asians Are Awesome Association |
| AAAASF | Army Aviation Association of America Scholarship Foundation |
| AAAASF | Army Aviation Association of America Scholarship Fund |
| AAAASFI | Army Aviation Association of America Scholarship Foundation Incorporated |
| AAAASFI | Army Aviation Association of America Scholarship Foundation, Inc. |
| AAACO | Alliance of African American Community Organizations |