| Abbreviation | Definition |
|---|---|
| ROIM | Risk oriented Inspection and Maintenance |
| ROIP | Residual Oil In Place |
| ROISTERED | roisteredroistering |
| ROISTERED | roistering |
| ROIT | Rotterdam Organizational Identification Test |
| ROIT | Royal Oaks Invitational Tournament |
| ROJ | Radiat Oncol J |
| ROJ | Remove Outer Jacket |
| ROJ | Republic of Julie |
| ROJ | rest of Japan |
| ROJ | Retired on the Job |
| ROJ | Return of the Jedi |
| ROJ | Royal Order of Jesters |
| ROJO | Rely On Jesus Only |
| ROK | RAW ORGANIC and KOMBUCHA |
| ROK | Rebels Of Killermar |
| ROK | Return Of Kings |
| ROK | Riders of Kawasaki |
| ROK | Rippmann Oesterle Knauss |
| ROKOBA | rok Oba |