| Research Special Division | Academic & Science |
| Repeat Subgoal Depth | Academic & Science |
| Ross Sea Disconformity | Academic & Science |
| Really Simple Discovery | Academic & Science |
| Rock Sound | Airport Code |
| Retail Systems Devices | Business |
| Reactive Sputter Deposition | Chemistry |
| Riverview School District | Community |
| Really Simple Discoverability | Community |
| Real Social Dynamics | Community |
| Richland School District | Community |
| Roosevelt School District | Community |
| Rochester School for the Deaf | Community |
| Recovery School District | Community |
| Russellville School District | Community |
| Retrieve, Scan, Delete | Computing |
| Remote Software Download | Computing |
| Route Server Daemon | Computing |
| Rapid Software Delivery | Computing |
| Restart Data Set | Computing |
| Root System Description | Computing |
| Rotary Sampling Device | Computing |
| Retinal Scan Display | Computing |
| Dinar | Country Currency |
| Resource Specific Data | Database Management |
| Realy Strange Disease | Disease |
| Really Stupid Disease | Disease |
| Rebekah Scott Designs | General |
| Receiving Shipping Department | General |
| Remote Sensing Division | General |
| Robust Standard Deviation | General |
| Rural Sanitory District | General |
| Ruchome Stanowisko Dowodzenia | General |
| Regulator of Sigma D | General |
| Rear Swing Door | General |
| Road Sign Detection | General |
| Real-Time Traffic Sign Detection | General |
| Raised | General |
| Ruckstrom Drossel | General |
| Road Safety Division | General |
| Retrofit Safety Device | General |
| Rally Solo Department | General |
| Road Safety Department | General |
| Road Safety Days | General |
| Road Safety Directorate | General |
| Right Sliding Door | General |
| Rocker Stop Device | General |
| Rally Sport Direct | General |
| Rat Sleep Deprivation | General |
| Roeland Schmohl Design | General |
| Rapey Sociopath Douchebag | General |
| Rubber Side Down | General |
| Refundable Security Deposit | General |
| Rack Scale Design | General |
| Rally Sport Development | General |
| Random Stream Drawing | General |
| Radar Speed Display | General |
| Responsive Signal Design | General |
| Romania Brasov Spring Dynamics | General |
| Rejection Sensitive Dysphoria | General |
| Right Side Drive | General |
| Reduced Stopping Distance | General |
| Rapid Sixer Dominator | General |
| Recessed Sliding Drawer | General |
| Refugee Status Determination | General |
| Retail Services Division | General |
| Serbian Dinar | General |
| Record Store Day | General |
| Reflex Sympathetic | General |
| Rotationally Supported Disk | General |
| Roland Sands Design | General |
| Refrigeration Supplies Distributor | General |
| Regulatory Services Division | General |
| Reflex Sympathy Dystrophy | General |
| Rural Sanitary District | Governmental |
| Real Street Drags | Governmental |
| Reader Searcher Downloader | Internet |
| Relative Standard Deviation | Maths |
| Residual Standard Deviation | Maths |
| Reflex Sympathetic Dystrophy | Medical |
| Royal Southwell Dispensary | Medical |
| Reflex Sympathetic Disorder | Medical |
| Reporting of Supply Discrepancy | Military and Defence |
| Response Surface Design | Physics Related |
| Republic of Serbia Dinar | Regional |
| Requirements and Specifications Document | Space Science |
| Race Specific Design | Sports |
| Rec Sport Disc | Sports |
