| Abbreviation | Definition |
|---|---|
| AABC | Australian Associated Bonsai Clubs |
| AACC | Avicultural Advancement Council of Canada |
| AB | Apple Blossom |
| ABA | Abscisic Acid |
| ABA | ABscissic Acid |
| ABA | African Bonsai Association |
| ABC | American Botanical Council |
| ABCD | Access to Biological Collections Data |
| ABCP | African Blackwood Conservation Project |
| ABE | Anomalous Biological Entity |
| ABF | Activated Biofilter |
| ABG | Atlanta Botanical Gardens |
| ABIS | Andean Botanical Information System |
| ABLO | Australian Botanical Liaison Officer |
| ABLS | American Bryological and Lichenological Society |
| ABRS | Australian Biological Resources Study |
| ABS | American Begonia Society |
| ABS | American Bonsai Society |
| ABS | American Bryological Society |
| ACA | American Chichlid Association |