| Acronym | Definition |
|---|
| RRI➣Rights and Resources Initiative |
| RRI➣Radio Romania International |
| RRI➣Rotman Research Institute |
| RRI➣Reverse Route Injection |
| RRI➣Raman Research Institute |
| RRI➣Reverse Route Injection (routing process) |
| RRI➣Radio Republik Indonesia (Indonesian national radio station; est. 1945) |
| RRI➣Resource Renewal Institute |
| RRI➣Robarts Research Institute |
| RRI➣Risk Reduction Index (DARA International) |
| RRI➣Riverside Research Institute |
| RRI➣Recumbent Riders International (cycling) |
| RRI➣Renal Research Institute (USA) |
| RRI➣Research Reactor Institute |
| RRI➣Régime de Retraite Individuel (French: Individual Pension Plan; Canada) |
| RRI➣Rainforest Rescue International |
| RRI➣Route Relay Interlocking (railway signaling) |
| RRI➣Residential Recycling Initiative |
| RRI➣Resona Research Institute (Japan) |
| RRI➣Rhein Ruhr International (German engineering company) |
| RRI➣Rick Ross Institute (cults) |
| RRI➣Regional Return Initiative (now part of MARRI) |
| RRI➣Response Resource Inventory |
| RRI➣Response to Request for Information |
| RRI➣Recognition Research, Inc. (Blacksburg, VA; est. 1989) |
| RRI➣Race Relations Institute (Fisk University; Nashville, TN) |
| RRI➣Resource Reservation Interval |
| RRI➣Reverse Rate Indication |
| RRI➣Railroad Inspections (VRE) |
| RRI➣Recognition Research International |
| RRI➣Range Response Improvement (marksmanship) |
| RRI➣Ready for Roll-out and Implementation |
| RRI➣Remote Radio Interface |
| RRI➣Risk Reduction Interval |
| RRI➣Ryan Research International (research and publishing organization; Chico, CA) |