| Abbreviation | Definition |
|---|---|
| AAB | All Amateur Basketball |
| AABA | All American Basketball Alliance |
| AABA | All-American Basketball Alliance |
| AABC | Alaska Association of Basketball Coaches |
| AAIBA | Agency of All India Basketball Association |
| ABA | adriatic basketball association |
| ABA | American Basketball Association |
| ABA | Atwater Basketball Association |
| ABAI | Amateur Basketball Association of Ireland |
| ABBK | Askøy Basketball Klubb |
| ABL | Altamonte Basketball League |
| ABL | American Basketball League |
| ABL | ASEAN Basketball League |
| ABLA | Amateur Basketball League Arad |
| ABOA | Alberta Basketball Officials Association |
| ABOA | Austin Basketball Officials Association |
| ABVT | Arnis Basketball Volleyball and Taekwondo |
| ACBC | Aloha College Basketball Club |
| ACWB | Alvernia College Womens' Basketball |
| ADBA | Australian Defence Basketball Association |