| Abbreviation | Definition |
|---|---|
| ROC | Redemption Online Championship |
| ROC | Rensselaer Outing Club |
| ROC | Rise Of Chronicle computer game |
| ROC | Rulers Of Cheats |
| ROCS | Ravens Of Carleton Swimming |
| ROE | Reached base On Error (in baseball) |
| ROF | Ring Of Fire Championship Fighting |
| ROH | Ring Of Honor |
| ROHA | Royal Oak Hockey Association |
| ROIT | Reading Organized Indoor Training |
| ROR | Rookie Of the Race |
| RORC | Royal Ocean Racing Club |
| ROS | Recreation Opportunity Spectrum |
| ROS | Rookie Online Series |
| ROTG | Runnin of the Green |
| ROU | Roulette |
| ROW | Regulation and Overtime Wins |
| ROY | Rookie Of The Year |
| RP | Rinks Parents |
| RP | Role Playing |