| OAR | 'ON-AIR-RALLIES' 
| Others |
| OAR | Chairman of The Joint Chiefs of Staff Operation Plans Assessment Report
| Others |
| OAR | Objectives Accountability Review
| Others |
| OAR | Observe And Report
| Others |
| OAR | Oceanic and Atmospheric Research
| Others |
| OAR | Of A Revolution
| Others |
| OAR | Off-Axis Ratio
| Others |
| OAR | Offal And Regurgitation
| Others |
| OAR | Offender Aid And Restoration
| Others |
| OAR | Office of AIDS Research
| Others |
| OAR | Office of Air and Radiation
| Others |
| OAR | Office of Animal Resources
| Others |
| OAR | Office of Oceanic and Atmospheric Research
| Others |
| OAR | Ohio Alleycat Resource
| Others |
| OAR | Old Augusta Railroad
| Others |
| OAR | Old Augusta Railroad Company
| Others |
| OAR | Olympia Area Rowing
| Others |
| OAR | Olympic Athletes from Russia
| Others |
| OAR | Olympic Athletes of Russia
| Others |
| OAR | Online Annual Reports
| Others |
| OAR | Operation Air Raid
| Others |
| OAR | Operations Acceptance Review
| Others |
| OAR | Operations Assistance Request
| Others |
| OAR | Opportunities Alternatives And Resources
| Others |
| OAR | Opportunity Alliance Reentry
| Others |
| OAR | Optical Analog Receiver
| Others |
| OAR | Optical Application Router
| Others |
| OAR | Oracle Accounts Receivable
| Others |
| OAR | Oregon Administrative Rules
| Others |
| OAR | Organ At Risk
| Others |
| OAR | Organization for Autism Research
| Others |
| OAR | Organs at risk
| Others |
| OAR | Original Aspect Ratio
| Others |
| OAR | Ottagan Addictions Recovery
| Others |
| OAR | Outside Activity Report
| Others |
| OAR | Overall Assessment Rating
| Others |
| OAR | Overhead Absorption Rate
| Others |
| OAR | Owner's Authorized Representative
| Others |
| OAR | Oxford Applied Research
| Others |