| Abbreviation | Definition |
|---|---|
| AURORA | Auxiliary Union for Rallying Observation Recording Analysis |
| AUS | American Union State |
| AUSC | African Union Sports Council |
| AUSD | Auburn Union School District |
| AUST | Allied Unions Superannuation Trust |
| AUSU | Aberdeen University Sports Union |
| AUSU | Algoma University Students' Union |
| AUSU | Athabasca University Students' Union |
| AUT | Association of University Teachers |
| AUU | Adelaide University Union |
| AUWU | All Ukrainian Workers Union |
| AUWU | All-UP Workers Union |
| AUWU | Australian Unemployed Workers' Union |
| AUYWG | African Union Youth Working Group |
| AVCU | Ark Valley Credit Union |
| AVCU | Association of Vermont Credit Unions |
| AVPU | Azerbaijan Volunteers Public Union |
| AVPU | Azerbaijan Volunteers' Public Union |
| AWA | Australian Workplace Agreement |
| AWH | Armaturenwerk Hötensleben GmbH |