- ARE (Atelier de Construction Roanne)
- AREA (Additional Reinforcement Enrichment Activities)
- AREC (Air Resource Element Coordinator)
- ARENA (Area Recreation, Entertainment, Nutrition, and Association)
- ARES (Amateur Radio Emergency Service)
- AREST (anticipate, redifferentiate, empower, supervise and assess)
- ARESV (analysis of reservoir)
- ARETS (Armour Remote Target System)
- AREUEA (The American Real Estate and Urban Economics Association)
- ARF (ASEAN Regional Forum)
- ARFF (Achievement, Respect, Fun, And Freedom)
- ARFFC (Alzheimer's Research Foundation, Fisher Center)
- ARFOR (Army Forces)
- ARFORGEN (Army force generation)
- ARFPC (Army Reserve Forces Policy Committee)
- ARFS (aggression risk factors survey)
- arg (Aragonese language (ISO 639-2 code))
- ARGH (Autism Rights Group Highland)
- ARGO (Automatic Ranging Grid Overlay)
