| Abbreviation | Definition |
|---|---|
| 5HS | 5 Hertford Street |
| AAAC | Aurora Area Apple Core |
| AACC | Abe Ani Combat Club |
| AACCC | Antique Auto Club of Cape Canaveral |
| AADC | Auburn Area Democratic Club |
| AAFC | Association of Australian Football Clubs |
| AAFU | American Association of Firearms Users |
| AAHC | Anti Anti Hentai Club |
| AARC | Ak-Sar-Ben Amateur Radio Club |
| AARC | Ambler Area Running Club |
| AARC | Anne Arundel Radio Club |
| AARC | Aruba Amateur Radio Club |
| AARC | Ashburn Area Running Club |
| AARSC | Ajax Adult Recreational Soccer Club |
| AATC | Ann Arbor Track Club |
| AAWC | Axis Allies World Club |
| ABAC | Atlanta Broadcast Advertising Club |
| ABAC | Avila Bay Athletic Club |
| ABBCC | All Breeds Border Cat Club |
| ABC | Amateur Boxing Club |