| Abbreviation | Definition |
|---|---|
| AASF | Asian Amateur Swimming Federation |
| ABEST | Athletic Bicycle Equipment Swimming and Triathlon |
| ABSF | Antigua Barbuda Swimming Federation |
| ACS | All Can Swim |
| ACST | Avon Community Swim Team |
| ADMS | Adirondack District Masters Swimming |
| AED | Automated External Defribilator |
| AFFS | Armed Forces Free Swimming |
| AOSC | Arundel Olympic Swim Center |
| AOWS | Albania Open Water Swimming |
| ARSC | Arcadia Riptides Swimming Club (California, US) |
| ASA | Amateur Swimming Association |
| ASATT | Amateur Swimming Association of Trinidad and Tobago |
| ASCA | American Swimming Coaches Association |
| ASMB | Adult Swim Message Boards |
| ASSA | Alberta Summer Swimming Association |
| ASUM | Amateur Swimming Union of Malaysia |
| ATST | Amherst Tritons Swim Team |
| BAC | Beaches Aquatic Club |
| BASIC | Badminton And Swimming Including Cycling |