| R | Republican |
| RAF | Royal Air Force |
| RAMC | Royal Army Medical Corps |
| RCAF | Royal Canadian Air Force |
| RCMP | Royal Canadian Mounted Police |
| Regn | Region |
| Regt | Regiment |
| Regtl | Regimental |
| rels | rels |
| Rep | Representative |
| ret | retired |
| Revd | Reverend |
| Revy | Revolutionary |
| RFD | Rural Free Delivery |
| RMC | Royal Military College |
| RN | Royal Navy |
| ROTC | Reserve Officer Training Corps |
| Rt | Right |