| Abbreviation | Definition |
|---|---|
| ARF | Air Reserve Force |
| ARF | Air Reserve Forces |
| ARF | All Ready To Fly |
| ARF | Almost Ready To Fly |
| ARF | Army Reserve Force |
| ARFC | Army Rugby Football Club |
| ARFF | Air Reserve Forces Facility |
| ARFOR | Army Forces |
| ARFPC | Army Reserve Forces Policy Committee |
| ARFS | aggression risk factors survey |
| ARG | Amphibious Ready Group |
| ARGO | Automatic Ranging Grid Overlay |
| ARGO | Auto-Regulating Gas Operated |
| ARGUS | Advanced Real-time Gaming Universal Simulation |
| ARH | Antiradiation Homing |
| ARI | Addressee Routing Indicator |
| ARI | Army Research Institute (for behavioral and social sciences) |
| ARI | Automatic Return Item |
| ARIA | Advanced Range Instrumentation Aircraft |
| ARIANE | Family of French Launch Vehicles |