| Acronym | Definition |
|---|
| RIR➣Rock in Rio (rock music festival) |
| RIR➣Richmond International Raceway |
| RIR➣Regional Internet Registry |
| RIR➣Rhode Island Red (chicken) |
| RIR➣Release Initiation Review |
| RIR➣Renault Industrie Roumanie |
| RIR➣Rosebud Indian Reservation (South Dakota) |
| RIR➣Royal Irish Regiment |
| RIR➣Reduction In Recruitment |
| RIR➣Research in Review (Pennsylvania Department of Corrections) |
| RIR➣Recordable Incident Rate (occupational safety statistic) |
| RIR➣Regulatory Impact Review (fishing) |
| RIR➣Recordable Injury Rate (workplace injuries) |
| RIR➣Royal Irish Rifles |
| RIR➣Reference Intensity Ratio |
| RIR➣Room Impulse Response (acoustics) |
| RIR➣Remedial Investigation Report |
| RIR➣Responses to Information Requests |
| RIR➣Railway Interoperability Regulations (UK) |
| RIR➣Roth Investor Relations, Inc. (Manalapan, NJ) |
| RIR➣Range Instrumentation Radar |
| RIR➣Receiving Inspection Report |
| RIR➣Réseau Inter-Régional (French: Inter-Regional Network) |
| RIR➣Repatriation Information Report |
| RIR➣Relative Importance Rating (customer service issues) |
| RIR➣Refund Intercept Request |
| RIR➣Risk Identification Report |
| RIR➣Rights and Interest Records |
| RIR➣Reduction in Recordable |
| RIR➣Rapid Information Retrieval |
| RIR➣Residual Impairment Ratio |
| RIR➣Readiness Improvement Review |
| RIR➣Reportable Item Report (US NASA) |
| RIR➣Rapid Incident Response |