| Abbreviation | Definition |
|---|---|
| RRN | Réseau Routier National |
| RRN | River Run Network |
| RRN | Robot Rebel Number |
| RRNA | Ribosomal ribo nucleic acid |
| RRNA | Rita Ranch Neighborhood Association |
| RRNA | Rolls Royce North America |
| RRNRD | Red Rock 'N Roller Derby |
| RRO | Radio Rottu Oberwallis |
| RRO | Record Route Object |
| RRO | Red Raider Orientation |
| RRO | Registered Roof Observers |
| RRO | Residual Range Organics |
| RRO | Return to Rightful Owner |
| RRO | Risk Reduction Overview |
| RRO | Runtime Resource Overlay |
| RROC | Reduced Recoil Operation Control |
| RROC | Regression Receiver Operating Curves |
| RROC | Reliability and Repair Operations Center |
| RROC | Retriever Rescue of Colorado |
| RROC | Round Rock Opportunity Center |