| Abbreviation | Definition |
|---|---|
| ABSD | Asoc de Bodyboard de Santo Domingo |
| ABT | Abs, Buns, and Thighs |
| ABTA | American Bowlers Tournament Association |
| ABVT | Australian Beach Volleyball Tour |
| ABW | Aitkin Backyard Wrestling |
| ABW | Amateur Backyard Wrestling |
| ABWF | Alliance of Baffled Wade Fishermen |
| AC | Adventure Club |
| AC | After Championship |
| AC | After Crowning |
| AC | After Cubs |
| AC | Associazione Circle |
| AC | Athletic Club |
| ACA | Adventure Cycling Association |
| ACA | American Canoe Association |
| ACA | Austin Cycling Association |
| ACAI | American Canoe Association, Inc. |
| ACATS | American Catfish Angler Tournament Series |
| ACB | Athletic Club Of Bend |
| ACB | Australian Cricket Board |