| Abbreviation | Definition |
|---|---|
| RNA | Rations Not Available |
| RNA | Royal Nepalese Army |
| RNAV | Area Navigation |
| RNF | Royal Northumberland Fusiliers |
| RNF | Russian No-holds-barred Fighting |
| RNG | Ranger |
| RNGR | Ranger |
| RNGSA | Royal Navy Gliding and Soaring Association |
| RNK | Rank |
| RNL | Receipt Notification Letter |
| RNL | Resistance and Liberation |
| RNL | Revolution in Naval Logistics |
| RNLAF | Royal Netherlands Air Force |
| RNM | Resource Needs Model |
| RNN | Royal Netherlands Navy |
| RNNS | Royal Naval Nursing Service |
| RNOAF | Royal Norwegian Air Force |
| RNP | Remote Network Processor |
| RNR | Receiver Not Ready |
| RNR | Royal Naval Reserve |