| Abbreviation | Definition |
|---|---|
| ACTP | A Chance To Play |
| ACW | Absolute Carnage Wrestling |
| ACW | Ace Championship Wrestling |
| ACW | Albany Championship Wrestling |
| ACW | Alternative Championship Wrestling |
| ACW | Always Championship Wrestling |
| ACWB | Alvernia College Womens' Basketball |
| ACYF | All-China Youth Federation |
| AD | Academic Decathlon |
| AD | Athletic Director |
| AD | Auto Dueler |
| ADA | Anti Deer Association |
| ADAA | American Dodgeball Association of America |
| ADAG | Ayrshire Dalmilling Action Group (UK) |
| ADBA | American Drag Boat Association |
| ADD | Advanced Dungeons and Dragons |
| ADF | Average Dumb Fan |
| ADFL | American Developmental Football League |
| ADFR | Activate, Depress, Free, Repeat |
| ADIDAS | All Day I Dream About Sports |