| R&OA | Reliability and Quality Assurance 
| Others |
| ROA | Racehorse Owners Association
| Others |
| ROA | Radio Operator Authorization
| Others |
| ROA | Radio Operators Authorization
| Others |
| ROA | Radio Orphan Annie
| Others |
| ROA | Raiders Of Athena
| Others |
| ROA | Raman Optical Activity
| Others |
| ROA | Read Only Access
| Others |
| ROA | Read Only Attribute
| Others |
| ROA | Read-Only Access
| Others |
| ROA | Reality of Aid
| Others |
| ROA | Realm Of Anime
| Others |
| ROA | Rear Occupant Alert
| Others |
| ROA | Recently Out of Africa
| Others |
| ROA | Recognized Operating Agency
| Others |
| ROA | Record Of Achievement
| Others |
| ROA | Record on Appeal
| Others |
| ROA | Recreation Opportunities Analysis
| Others |
| ROA | Red Oak Academies
| Others |
| ROA | Refugee Olympic Athletes
| Others |
| ROA | Register of Actions
| Others |
| ROA | Rehab Or Annihilation
| Others |
| ROA | Rehabilitation of Offenders Act
| Others |
| ROA | Relative Operational Atmosphere
| Others |
| ROA | Remarketing of America
| Others |
| ROA | Remote Object Activation
| Others |
| ROA | Remote Overvoltage Adjust
| Others |
| ROA | Request of Absence
| Others |
| ROA | Research On Aging
| Others |
| ROA | Reserve Officers Association
| Others |
| ROA | Residential Owners Association
| Others |
| ROA | Resource Oriented Architecture
| Others |
| ROA | Response To Office Action
| Others |
| ROA | Restricted Operations Area
| Others |
| ROA | Results Of About
| Others |
| ROA | Retired Officers' Association
| Others |
| ROA | Return Of Assets
| Others |
| ROA | Return Of the Ancients
| Others |
| ROA | Return On Ad
| Others |
| ROA | Return On Asset
| Others |
| RoA | Return On Assets
| Others |
| ROA | Return On Athletics
| Others |
| ROA | Return On Average
| Others |
| ROA | Riders Of Apocalypse
| Others |
| ROA | Right Occiput Anterior
| Others |
| ROA | Right of Abode
| Others |
| ROA | Ring of Ages
| Others |
| ROA | Ring Of Assassins
| Others |
| ROA | Rip Off Artists
| Others |
| ROA | Rise of Artificial
| Others |
| ROA | Riviera Owners Association
| Others |
| ROA | Road America
| Others |
| ROA | Roanoke, Virginia USA
| Others |
| ROA | Romance (Other)
| Others |
| ROA | Round Of Applause
| Others |
| ROA | Route Optimization and Analysis
| Others |
| ROA | Route Origin Authorization
| Others |
| ROA | Route Origin Authorizations
| Others |
| ROA | Rover Owners Association
| Others |
| ROA | Rules Of Aquistion
| Others |
| ROA | Rules Of Attraction
| Others |
| ROA | Rutgers Optimality Archive
| Others |
| ROA | Rutgers Optimality Archiver
| Others |
| ROA | Ruvuma Orphans Association
| Others |