| AAA | amateur athletic association (skr.) |
|---|---|
| AACO | American Association of Certified Orthoptists |
| AAD | Assistant Athletic Director |
| AAPA | American Association of Port Authorities, Americké združenie prístavných úradov (angl.skr.) |
| AAS | Advances in the Astronautical Sciences |
| AAS | Australian Anthropological Society |
| AAS | Austrian Atherosclerosis Society |
| AAU | Amateur Athletic Union (skr.) |
| ABA | Australian Broadcasting Authority |
| ABBOT | americký spisovateľ, novinár a vydavateľ (Anthony, 1893-1952) |