| Abbreviation | Definition |
|---|---|
| RIRA | Roosevelt Island Residents Association |
| RIRE | Recreational Infrastructure Revenue Enhancement |
| RIRE | Retrospective Image Registration Evaluation |
| RIRG | Racial Incident Response Group |
| RIRG | Racial Incidents Review Group |
| RIRG | Regional Information Reference Group |
| RIRG | Rural Issues Reference Group |
| RIRL | Rap In Real Life |
| RIRL | Ruttonsha International Rectifier Ltd |
| RIRO | Reaching IN Reaching OUT |
| RIRO | Repair Item Replacement Option |
| RIRO | Repairable Item Replacement Option |
| RIRO | Respiration Induced Resonance Offset |
| RIRO | Right in right out |
| RIRO | Right-In Right-Out |
| RIRO | Roll In Roll Out |
| RIRO | Rubbish In Rubbish Out |
| RIRO | Run In Run Out |
| RIRS | Regulatory Information Retrieval System |
| RIRS | Rhode Island Radiology Society |