| Abbreviation | Definition |
|---|---|
| ADIDAS | All Day I Dream About Streaking |
| ADIQ | Alpinisti Diabetici In Quota |
| ADL | Attack Defense League |
| ADM | All Day Mat |
| ADM | American Development Model |
| ADMS | Adirondack District Masters Swimming |
| ADNL | Aylesbury District Netball League |
| ADO | Alles Door Oefening |
| ADP | Attacking Dice Pool |
| ADP | Average Draft Position |
| ADRP | Anti Doping Research Panel |
| ADRP | Anti Doping Research Program |
| ADS | Aitken Double Stars |
| ADS | Almost Dry Suit |
| ADS | Automatic Dice Server |
| ADSA | Alberta Disc Sports Association |
| ADSA | Ashton and District Snowmobile Association (Ontario) |
| ADTM | American Discovery Trail Marathon |
| AE | Also Eligible |
| AE | Anime Experience |