| Abbreviation | Definition |
|---|---|
| ERN | European Rivers Network |
| ERNIE | Encyclopedia of Romantic Nationalism in Europe |
| ERO | European Radiocommunications Office |
| ERO | European Research Office |
| ERP | European Recovery Program |
| ERP | European Recycling Platform |
| ERPA | European Recovered Paper Association |
| ERPA | European Research Papers Archive |
| ERPB | European Retail Payments Board |
| ERPC | European Recovered Paper Council |
| ERPC | European Roma Policy Coalition |
| ERPT | European Review of Political Technologies |
| ERQ | European Relocation Qualification |
| ERR | European Rail Rent |
| ERR | European Respiratory Review |
| ERRC | European River Restoration Conference |
| ERRC | European Roma Right Centre |
| ERRC | European Roma Rights Centre |
| ERRG | European Retinoid Research Group |
| ERRT | European Retail Round Table |