| AAB | Alliance Agricole Belge |
|---|---|
| AAC | Alliance Agricole Belge |
| AACO | Amaryllis Avakian Clinica Oftalmologica |
| AAI | Alliance of American Insurers |
| AAR | Alliance for Aging Research |
| AARON | meno režiséra Spellinga |
| AAS | Alliance of AIDS Services (skr.) |
| ABELSON | americký fyzik (Phillip Hauge, 1913-2004) |
| ABS | Alternative Billing Service |
| ABS | Automated Billing System |