| Abbreviation | Definition |
|---|---|
| RATS | Rat Assistance Teaching Society |
| RATS | Rotating And Turbomachinery Society |
| RAVI | Netherlands Council for Geographical Information |
| RBGS | Royal Burgess Golfing Society |
| RBSA | Royal Birmingham Society of Artists |
| RBSM | Robert Burns Society of the Midlands |
| RBWES | Royal Bath and West of England Society |
| RCA | Académie Royale des Arts du Canada |
| RCA | Acadmie Royale des Arts du Canada |
| RCA | Royal Canadian Academy of Arts |
| RCAS | Rickmansworth Conservative Angling Society |
| RCCO | Royal Canadian College of Organists |
| RCCS | Rofeh Cholim Cancer Society |
| RCDS | Richmond County Dental Society |
| RCDS | Ryerson Communication and Design Society |
| RCFS | Russian Chechen Friendship Society |
| RCGS | Royal Canadian Geographical Society |
| RCGS | Société géographique royale du Canada |
| RCGS | Socit gographique royale du Canada |
| RCHS | Railway and Canal Historical Society |