| Acronym | Definition |
|---|
| ERO | Enforcement and Removal Operations (US DHS) |
| ERO | Education Review Office (New Zealand) |
| ERO | European Radiocommunications Office |
| ERO | Electoral Registration Officer |
| ERO | Énergies Renouvelables de l'Ouest (French: Western Renewable Energy) |
| ERO | Emergency Restraining Order |
| ERO | Emergency Response Organization |
| ERO | Electric Reliability Organization |
| ERO | Electronic Return Originator (US Internal Revenue Service) |
| ERO | Explicit Route Object (protocol) |
| ERO | Eastern Regional Office |
| ERO | Emergency Response Officer |
| ERO | Encarta Research Organizer |
| ERO | Encapsulated Realtime Objects |
| ERO | Employee Relations Officer |
| ERO | Entreprise de Récupération Ouest (French: Corporate Recovery West; Algeria) |
| ERO | Early Retirement Option |
| ERO | Engineered Refueling Overhaul (US Navy) |
| ERO | European Risk Observatory (European Agency for Safety and Health at Work) |
| ERO | Enterprise Resource Optimization |
| ERO | Endoplasmic Reticulum Oxidoreductase (proteins) |
| ERO | European Research Office |
| ERO | Equal Rights Office |
| ERO | Edge Roll-Off (silicon wafer geometry) |
| ERO | Equipment Repair Order (USMC) |
| ERO | Early Release Observation |
| ERO | Export Regulations Office (IBM Corp.) |
| ERO | Event-Related Oscillations |
| ERO | Emergency Repair Overseer (US Navy) |
| ERO | Eightball Run Out (billiards) |
| ERO | European-American Rights Organization (pro-white group) |
| ERO | Exponential Rate Optimal (test) |
| ERO | Eastern Rehabilitation Organization (Sri Lanka) |
| ERO | Electronics Readiness Officer |
| ERO | Earned Run Out (Pool; break and run table) |
| ERO | European Racing Organisation |
| ERO | Engines Running On-Load/Off-Load |
| ERO | Errored input from other systems queue |