| ERO | Early Read Out 
| Others |
| ERO | Earned Run Out
| Others |
| ERO | Education Review Office
| Others |
| ERO | Educational Review Office
| Others |
| ERO | EDUCAUSE Review Online
| Others |
| ERO | Eibach Racing Offroad
| Others |
| ERO | Electoral Registration Officer
| Others |
| ERO | Electric Reliability Organization
| Others |
| ERO | Electronic Registrar Online
| Others |
| ERO | Electronic Return Originator
| Others |
| ERO | Emergency Response Officer
| Others |
| ERO | Emergency Response Operations
| Others |
| ERO | Emergency Response Organization
| Others |
| ERO | Encapsulated Realtime Objects
| Others |
| ERO | Encarta Research Organizer
| Others |
| ERO | Enforcement and Removal Operations
| Others |
| ERO | Enforcement Removal Operations
| Others |
| ERO | Engine Running On
| Others |
| ERO | Engineering Release Operations
| Others |
| ERO | Enterprise Release Option
| Others |
| ERO | Essex Record Office
| Others |
| ERO | Euphoria Ragdoll Overhaul
| Others |
| ERO | European Radiocommunications Office
| Others |
| ERO | European Research Office
| Others |
| ERO | Explicit Route Object
| Others |
| ERO | Extended Ruggedness and Optics
| Others |
| ERO | Extraterrestrial Resistance Organization
| Others |