| AACO | Arts and Culture Observatory (skr.) |
|---|---|
| AANS | Afroasian News Service (skr.) |
| AAS | Aging and Adult Services |
| AAS | Airport Advisory Service |
| AAS | Alliance of AIDS Services (skr.) |
| AAS | American Auto Service |
| ABASTUMANI | astronomické observatórium pri obci Abastumani |
| ABASTUMANI | astronomické observatórium v Gruzínsku |
| ABS | Alternative Billing Service |
| ABS | American Breeders Services |