| RIR | Radiation Isolation Room 
| Others |
| RIR | Randy is real
| Others |
| RIR | Re Imagine Reporting
| Others |
| RIR | Real Interest Rate
| Others |
| RIR | Rear Inside Right
| Others |
| RIR | Recordable Incident Rate
| Others |
| RIR | Recordable Injury Rate
| Others |
| RIR | Reduction In Recruitment
| Others |
| RIR | Reference Intensity Ratio
| Others |
| RIR | Reflective Infrared sensor
| Others |
| RIR | Regional Internet Registries
| Others |
| RIR | Regional Internet Registry
| Others |
| RIR | Regionally Important Resource
| Others |
| RIR | Release Initiation Review
| Others |
| RIR | Renault Industrie Roumanie
| Others |
| RIR | Reportable Item Report
| Others |
| RIR | Reps in Reserve
| Others |
| RIR | Reps In Reverse
| Others |
| RIR | Research In Review
| Others |
| RIR | Resolution Independent Raster
| Others |
| RIR | Resolve Initial References
| Others |
| RIR | Response Interruption/Redirection
| Others |
| RIR | Responsibility Integrity Respect
| Others |
| RIR | Rethink, Incorporate, and Rewrite
| Others |
| RIR | Retirement Internet Reporting
| Others |
| RIR | Rhode Island Re
| Others |
| RIR | Rhode Island Rebellion
| Others |
| RIR | Rhode Island Red
| Others |
| RIR | Rhode Island Road
| Others |
| RIR | Richmond International Raceway
| Others |
| RIR | Risk Identification Report
| Others |
| RIR | River Island Rancho
| Others |
| RIR | Riverside Fla-Bob Airport, Riverside/ Rubidoux, California USA
| Others |
| RIR | Riverside International Raceway
| Others |
| RIR | Rock in Rio
| Others |
| RIR | Rockers In Recovery
| Others |
| RIR | Room In Roof
| Others |
| RIR | Rylan Is Rubbish
| Others |