| Meaning | Category |
| Readin Riten Rithmatic | Miscellaneous->Funnies |
| Reading Respect Responsibility | Community->Educational |
| Really Really Really | Internet->Chat |
| Receiving Recording Reviewing | Community->Media |
| Reduce, Reuse, Recycle | Governmental->Environmental |
| Reform, Relief, Recovery | Governmental->US Government |
| Regular rate and rhythm | Medical->Physiology |
| Relative Risk Reduction | Academic & Science->Mathematics |
| Required Reserve Ratio | Business->Accounting |
| Residual Resistance Ratio | Academic & Science->Electronics |
| Risk Reduction Report | Governmental->Military |
| Risk Reduction Review | Governmental->NASA |
| Risk Retention Reporter | Community->Media Governmental->US Government |
| Romper Room Reject | Community->Educational |
| Round Robin Rtos | Computing->General |
| Rum Romanism And Rebellion | Miscellaneous->Funnies |
| SOS for a Surface Raider Attack | Governmental->Military |
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