| Abbreviation | Definition |
|---|---|
| RNVC | Reference Number Variation Code |
| RNVR | Royal Navy Volunteer Reserve |
| RNX | Richard Nakka Experimental Rocket Propellant |
| RNX-62 | Epoxy Composite Propellant |
| RNY | Runway |
| RNZAF | Royal New Zealand Air Force |
| RNZN | Royal New Zealand Navy |
| RO | Range Officer |
| RO | Rebel Outpost |
| RO | Recruiting Officer |
| Ro | Search Radius Rounded to Next Highest Whole Number |
| RO/RO | Roll On/ Roll Off |
| RO/RO | Roll-On/roll-Off |
| ROA | Radio Operator Authorization |
| ROA | Restricted Operations Area |
| ROA | Retired Officers' Association |
| ROA | Russkaya Osvoboditel'naya Armiya(Russian Liberation Army) |
| ROAB | Region Ombudsman Advisory Board |
| ROAD | Retired On Active Duty |
| ROAMS | Replacement Operations Automated Management System |