| Acronym | Definition |
|---|
| ARL | Association of Research Libraries |
| ARL | Arlington (Virginia, USA) |
| ARL | ADP (Adenosine Diphosphate) Ribosylation Factor-Like |
| ARL | Army Research Laboratory (US Army) |
| ARL | Animal Rescue League |
| ARL | Australian Rugby League |
| ARL | Applied Research Laboratory |
| ARL | Air Resources Laboratory |
| ARL | Authority Revocation List |
| ARL | Average Run Length |
| ARL | Airborne Reconnaissance Low |
| ARL | Aerospace Robotics Laboratory (Stanford University) |
| ARL | American Rights Litigators |
| ARL | Adjusted Ring Length |
| ARL | Attock Refinery Limited (Pakistan) |
| ARL | Access Rights List (Sprint) |
| ARL | Aeronautical Research Laboratory (Wright-Patterson AFB, Ohio) |
| ARL | Aviation Research Laboratory |
| ARL | Aquatic Research Laboratory (Lake Superior State Universary, Sault Ste Marie, Michigan) |
| ARL | Acceptable Reliability Level |
| ARL | Acceptable Risk Level |
| ARL | Admiralty Research Laboratory (UK) |
| ARL | Agricultural Research Laboratory |
| ARL | Aerial Reconnaissance Low |
| ARL | Arctic Research Laboratory |
| ARL | Repair Ship, Small |
| ARL | Address Resolution Lookup |
| ARL | Anti-Reflection Layer |
| ARL | Above Rail Level (railway clearance measurement) |
| ARL | Australian Reference Laboratory |
| ARL | Attendant Release Loop |
| ARL | Argentina Ley (national currency since1970; replaced by old Peso 1983) |
| ARL | Alcoa Research Laboratory (New Kensington, PA) |
| ARL | Average Revenue Lagged |
| ARL | Acceptable Reinvestment Level |
| ARL | Acceptance Reliability Level |
| ARL | Authorized Retention Level |
| ARL | Aviator Readiness Level |
| ARL | Auto Repuestos Linares (Guatemala) |
| ARL | Agricultural Research Labs |