| Abbreviation | Definition |
|---|---|
| RRL | Road Research Laboratory |
| RRMC | Royal Roads Military College (British Columbia) (19401995) now Royal Roads University |
| RRMC | Royal Roads Military College (British Columbia) (1940–1995) now Royal Roads University |
| RRMT | resistive respiratory muscle training |
| RRN | Rapid Response Network |
| RRO | Resource Recovery Office |
| RROD | Red River Ordnance Depot |
| RRPB | Range Requirements Prioritization Board |
| RRPGRATE | Recruitment, retention progression graduation. An academic term that refers to student attrition rate. |
| RRPGRATE | Recruitment, Retention Progression & Graduation |
| RRPGRATE | Recruitment, retention progression & graduation. An academic term that refers to student attrition rate. |
| RRPP | Rapid Response Planning Process |
| RRR | Risk Reduction Report |
| RRR | SOS for a Surface Raider Attack |
| RRS | Really Right Stuff |
| RRS | Risk, Reliability, and Safety Engineering |
| RRS | Rudder Roll Stabilisation |
| RRTF | Regulatory Reform Task Forces |
| RRU | Rescue And Recovery Unit |
| RRV | Red River Valley (Vietnam) |