| Abbreviation | Definition |
|---|---|
| ASL | Anti-Saloon League |
| ASL | Association for Symbolic Logic |
| ASLIA | Association of Sign Language Interpreters of Alberta |
| ASM | Autism Society of Michigan |
| ASMAC | Asociación de Scouts de México, A.C. |
| ASMET | Austrian Society for Metallurgy and Materials |
| ASN | AIDS Support Network |
| ASO | Aids Service Organizations |
| ASO | Arts Support Organization |
| ASOC | Antarctic and Southern Ocean Coalition |
| ASP | Astronomical Society of the Pacific |
| ASPCA | American Society for the Prevention of Cruelty to Animals |
| ASPIRE | America Savings for Personal Investment Retirement and Education |
| ASPNI | American Society for the Protection of Nature in Israel |
| ASQH | African Society for Quality in Healthcare |
| ASR | Australian Society of Rheology |
| ASS | Assam Sahitya Sabha |
| ASSDF | Arkansas State Square Dance Federation |
| ASSN | Association |
| AST | American Society of Transplantation |