| Abbreviation | Definition |
|---|---|
| AHSA | American Horse Show Association |
| AI | Anime Infinite |
| AISB | Ancient Illuminated Seers of Bavaria |
| AJA | Anti-Jaguar Association |
| AKA | American Kite Association |
| AKA | American Kitefliers Association |
| AKC | All Kritters Club |
| ALC | Azteca Lobby Card |
| ALRE | Alberta Land Rover Enthusiasts |
| ALSA | Alpaca and Llama Show Association |
| AMA | Academy of Model Aeronautics |
| AMA | Airplane Modelers Association |
| AMA | American Motorcyclist Association |
| AMC | Anime and Manga Club |
| AMG | Antec Metal Gray |
| AMHA | American Miniature Horse Association |
| AMHA | American Morgan Horse Association |
| AMLA | American Miniature Llama Association |
| AMS | Advanced Modeler's Syndrome |
| AMSRA | American MicroStock Racing Association |