| Abbreviation | Definition |
|---|---|
| ABATE | American Bikers Aiming Towards Education |
| ABC | Always Be Collective |
| ABI | Air Brush Ink |
| ABP | Artemis Black's Price |
| ABS | American Budgerigar Society |
| ABSC | Atlantic Beacon Sculpture Committee |
| ABSP | About Buttonhooks, Spoons, and Patents |
| ABYC | Alamitos Bay Yacht Club |
| ABYC | Algoa Bay Yacht Club |
| ACA | Australian Cloggers Association |
| ACAT | Atlanta Cask Ale Tasting |
| ACB | Auto Crew Builder |
| ACBL | American Contract Bridge League |
| ACC | Aisha Clan Clan |
| ACCA | Arctic Cat Club of America |
| ACCC | Association Of California Car Clubs |
| ACE | American Coaster Enthusiasts |
| ACFA | American Canary Fanciers Association |
| ACFA | American Cat Fanciers Association |
| ACFA | Atlanta Camaro and Firebird Association |