| AAB | Alliance Agricole Belge |
|---|---|
| AAB | Associazione Artisti Bresciani |
| AAB | Australasian Associated Brewers |
| AAC | Alliance Agricole Belge |
| AACO | Amaryllis Avakian Clinica Oftalmologica |
| AACO | Armenian American Christian Outreach |
| AACO | Asian Americans for Community Outreach |
| AACO | Australian Agricultural Company (skr.) |
| AAE | Australian Air Express |
| AAI | Alliance of American Insurers |