| Abbreviation | Definition |
|---|---|
| AITUC | All India Trade Union Congress |
| AJA | American Of Japanese Ancestry |
| AJSU | All Jharkhand Students Union |
| ALADS | Association for Los Angeles Deputy Sheriffs |
| ALECU | Abbott Laboratories Employees Credit Union |
| ALU | Arab Lawyers Union |
| AMA | Association of Musicians of Avant |
| AMAPCEO | Association of Management, Administrative and Professional Crown Employees of Ontario, The |
| AMBA | American Mold Builders Association |
| AMEA | Aviation and Marine Engineers' Association (NZ) |
| AMG | Acoustic Music Guild |
| AMMA | Association of Malayalam Movie Artists |
| AMOL | Active Management Of Labor |
| AMOU | Australian Maritime Officers Union |
| AMPU | A More Perfect Union |
| AMPU | Anvil Metal Pounders Union |
| AMSA | Assam Medical Service Association |
| AMU | Alumni Memorial Union |
| AMUL | Anand Milk Union LimitedIt |
| AMUL | Anand Milk Union Ltd |