| Abbreviation | Definition |
|---|---|
| RR | Range Rover |
| RR | Relaxed Rider |
| RR | Road Ready |
| RR | Road Roller |
| RRB | Railroad Retirement Board |
| RRBS | Rail Replacement Bus Service |
| RRI | Reference Roughness Index |
| RRIS | Railroad Research Information Service |
| RRJ | Road Riders For Jesus |
| RRJ | Russian Regional Jet |
| RRL | Runway Remaining Lights |
| RRP | Readily Releasable Pool |
| RRS | Rear Release System |
| RRS | Rudder Roll Stabilization |
| RRT | Rail Rapid Transit |
| RRTE | Reroute |
| RRTF | Rapid Response Transportation Fund |
| RRTF | Rural Road Transport Forums (South Africa) |
| RRTP | Rider Relief Transportation Program |
| RRV | Road Rail Vehicle |