| Acronym | Definition |
|---|
| ARO | Automatic Request for Retransmission |
| ARO | Army Research Office |
| ARO | ATS (Air Traffic Services) Reporting Office |
| ARO | After Receipt of Order |
| ARO | Academic Research Organization |
| ARO | Asset Retirement Obligation |
| ARO | Automobilul Romanesc |
| ARO | Application Resource Optimizer (software development) |
| ARO | Association for Research in Otolaryngology |
| ARO | Aromatase |
| ARO | Alfa Romeo Owners (car club; various locations) |
| ARO | Agreement on Rules of Origin (United Nations) |
| ARO | Acquisition Reform (US Navy) |
| ARO | Application Release Orchestration (Gartner) |
| ARO | Average Rate Option (finance) |
| ARO | Atlanta Regional Office (Georgia) |
| ARO | Air Refueling Operator (US Air Force) |
| ARO | Annualized Rate of Occurrence |
| ARO | Antibiotic Resistant Organisms |
| ARO | Air Traffic Services Reporting Office (Italy) |
| ARO | Access Request Object |
| ARO | Acquisition Reform Office |
| ARO | Agriculture Research Organization |
| ARO | Action Recovery Online (Montana) |
| ARO | Autosomal Recessive Osteopetrosis |
| ARO | Alternate Regulatory Option |
| ARO | Application Response Option (Computer Associates) |
| ARO | Association of Regional Observatories (UK) |
| ARO | Abrasion Resistant Overcoating |
| ARO | All Rods Out |
| ARO | Animal Resource Officer |
| ARO | Airport Reporting Office |
| ARO | Airport Reservations Office |
| ARO | Active Resonator Oscillator |
| ARO | Airborne Reconnaissance Office |
| ARO | Auxiliary Readout |
| ARO | Announcement of Research Opportunity (various organizations) |
| ARO | African Regional Organizations (workshop) |
| ARO | Altairian Religious Order |
| ARO | Alquiler Rehabilitacion Operacion (Spanish: Rental Rehabilitation Operation) |
| ARO | Automatic Reconfiguration Order (space physics) |
| ARO | Advanced Reactor Operations |
| ARO | Acquisition Requirements Office |
| ARO | Adspirant Reserve Officier (Dutch) |
| ARO | Auxiliary Retail Outlet |
| ARO | Alternate Retail Outlet (Harley-Davidson) |