| Abbreviation | Definition |
|---|---|
| APTW | Agensi Pekerjaan Tenaga Wira ADN BHD |
| APWC | American Premium Water Corporation |
| AQA | Assessment and Qualifications Alliance |
| AQC | Accredited Quality Contractor |
| AQC | Ag Quality Connection |
| AQCI | Applied Quality Communications Inc |
| AQL | (AQ) Limited |
| AQMD | Air Quality Management Division |
| AQP | Air Quality Professionals Inc |
| AQS | Advanced Quality System ( D1-9000) |
| AQS | Air Quality Sciences |
| AQS | Air Quality Services |
| AQS | Alaska Quality Seafood |
| AQS | Automotive Quality Solutions |
| AR | Atlas Research |
| ARA | Altstoff Recycling Austria |
| ARA | Applied Research Associates |
| ARAI | Allegany Rehabilitation Associates, Inc. |
| Aramco | Arabian American Oil Company |
| ARAMCO | Arabian American Oil Company (now Saudi Aramco) |