| Abbreviation | Definition |
|---|---|
| RHOGI | Radar Homing and Guidance Interceptors |
| RHQ | Regimental Headquarters |
| RHRDF | Royal Hutt River Defence Forces |
| RHRN | Royal Hutt River Navy |
| RI | Radiation Intensity |
| RI | Radio Intercept |
| RI | Refugees International |
| RI | Request for Information |
| RI | Routing Indicator |
| RIA | Rock Island Arsenal |
| RIAF | Royal Italian Air Force |
| RIAM | Rock Island Arsenal Museum |
| RIAS | Radio In the American Sector |
| RIAT | Rogue International Arms Trader |
| RIAT | Royal International Air Tattoo |
| RIB | Rigid Inflatable Boat |
| RIB | Rubberized Inflatable Boat |
| RIBT | Regional Information Base on Terrorism |
| RIC | Rare Item Code |
| RIC | Regiment Infantry Colonial |