| Abbreviation | Definition |
|---|---|
| ARS | Allianz Risk Service |
| ARS | Aon Risk Services |
| ARSI | Account Recovery Specialists Inc |
| ARSI | Asbestos Removal Services Inc |
| ART | Advanced Recognition Technologies |
| ART | Advanced Reproductive Technologies |
| ART | Authentic Replacement Technologies |
| ARTC | American Renaissance Theater Company |
| ARTC | Appeal Resource and Training Consortium |
| ARTC | Atlanta Radio Theatre Company |
| ARTC | Australian Rail Track Corporation |
| ARTI | Advanced Resource Technologies Inc |
| ARTS | Asphalt Rubber Technology Service |
| ARTS | Association for Retail Technology Standards |
| ARTS | Atlanta Reprographics and Typesetting Services |
| ARVC | American Remote Vision Corporation |
| ARWC | Awatere River Wine Company |
| ARYM | Ayurvedic Restorative Yoga Massage |
| AS | Advanced Subsidiary |
| AS&E | American Science and Engineering Inc |