| Abbreviation | Definition |
|---|---|
| ARMA | Association of Records Managers and Administrators |
| ARMA | Association of Russian Marriage Agencies |
| ARMAC | Akita Rescue Mid-Atlantic Coast, Inc. |
| ARMS | Advanced Retail Management Solutions |
| ARNC | Alabama River Newsprint Company |
| ARNI | American Realty Network Inc |
| ARO | Anodizing Racks Online |
| ARP | Accelerated Reader Program |
| ARP | American Recording Productions |
| ARPB | Associated Real Property Brokers, Inc. |
| ARPB | Associated Real Property Brokers, Incorporated |
| ARPC | Analysis Research and Planning Corporation |
| ARPC | Australian Reinsurance Pool Corporation |
| ARPL | Atmospheric Research PTY, LTD. |
| ARPL | Avesthagen Research PVT, LTD. |
| ARPL | Avkaash Resorts Private Limited |
| ARPU | Average revenue per user |
| ARRC | Alaska Rural Rehabilitation Corporation |
| ARRC | Aquatic Resource Restoration Company |
| ARRT | Applied Rail Research Technologies |