| Abbreviation | Definition |
|---|---|
| RTO | Retired Teachers of Ontario |
| RUSA | Reference & User Services Association |
| RVDA | National RV Dealers Association |
| RVIA | Recreational Vehicle Industry Association |
| SA | Societe Anonyme |
| SAA | Society for American Archaeology |
| SAABE | San Antonio Association of Building Engineers |
| SAAE | South African Association For Escos |
| SAAMI | Sporting Arms and Ammunition Manufacturers Institute |
| SABS | Southeastern Association Of Boarding Schools |
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| SACGNN | SACramento Get Networking Now |
| SACL | Southeastern Association of Colleges & Employers |
| SACRA | South African Clinical Research Association |
| SAE | Society of Automotive Engineers |
| SAEA | Southern Agricultural Economics Association |
| SAF | Society of American Foresters |
| SAFE | Society of Aviation and Flight Educators |
| SAFE | Southwest Association of Future Educators |
| SAGA | Senior Amateur Golfers Association |