| Abbreviation | Definition |
|---|---|
| ERC | Experienced Rider Course |
| ERIC | Each Region In Comradeship |
| ERM | Endfors Racing Motors |
| ERP | Early Racquet Preparation |
| ERP | Effective Rating Points |
| ERP | Enhanced Realistic Personality |
| ERR | Ellis River Riders |
| ERS | Exclusive Ride Session |
| ERSA | Eagle River Sports Arena |
| ERSA | Eastern Region Snowsports Association |
| ERTB | East Riding Thai Boxing |
| ES | Early Starter |
| ES | Enjoy Skateboarding |
| ES | Enjoy Skating |
| ESA | Eastern Surfing Association |
| ESA | Extreme Sports Association |
| ESBA | East Side Baseball Association |
| ESBL | Egham Staines Bowling League |
| ESC | Every Stroke Counts |
| ESCA | East of Scotland Cricket Association |