| REO | A Region Executive Officer 
| Others |
| REO | Radial Error Offset
| Others |
| REO | Range Estimate Object
| Others |
| REO | Ransom E Olds
| Others |
| REO | Ransom Eli Olds
| Others |
| REO | Rare Earth Ore
| Others |
| REO | Ratio of Error Object
| Others |
| REO | Re Employment Options
| Others |
| REO | Readiness Engineering Office
| Others |
| REO | Real Estate Owned
| Others |
| REO | Real Estated Owned
| Others |
| REO | Really Excellent OREO
| Others |
| REO | Red Elusive One
| Others |
| REO | Reentry Employment Opportunities
| Others |
| REO | Region Error Option
| Others |
| REO | Regional Economic Outlook
| Others |
| REO | Regional Ecosystem Office
| Others |
| REO | Regional Event Organiser
| Others |
| REO | Regional Executive Officer
| Others |
| REO | Research Electro Optics
| Others |
| REO | Research Enterprise Office
| Others |
| REO | Respiratory Enteric Orphan
| Others |
| REO | Responsible Engagement Overlay
| Others |
| REO | Responsible Engagement Overly
| Others |
| REO | Responsible Engagement Overview
| Others |
| REO | Result Evaluation Object
| Others |
| REO | Riot Engine Object
| Others |
| REO | Robin Entertainment Organisation
| Others |
| REO | Rogante Engineering Office
| Others |
| REO | Rome, Oregon USA
| Others |
| REO | Rubber Estate Organization
| Others |
| REO | Rural Employment Opportunities
| Others |