| Abbreviation | Definition |
|---|---|
| RO | Ragnarock online |
| RO | Random Object |
| RO | Recruitment Officer |
| RO | Recycled Organics |
| RO | Red Orchestra |
| RO | Reduced Offset |
| RO | Regional Openness |
| RO | Relational Operator |
| RO | Relay Operator |
| RO | Renewable Obligation |
| RO | Repair Order |
| RO | Requested Off |
| RO | requisitioning objective |
| RO | Response Only |
| RO | Responsible Officer |
| RO | Restricting Oxide |
| RO | Restriction Orifice |
| RO | Retail Outlet |
| RO | Reverse Osmose |
| RO | Reverse Osmosized |