| Abbreviation | Definition |
|---|---|
| ERKP | Ellicene Roundtree King Phillips LLC |
| ERMC | Emerson Russell Maintenance Company |
| ERN | Economics Research Network |
| ERPOC | E R Precision Optical Corporation |
| ERS | Emergency Response Services |
| ERS | Eternal Righting System Designs |
| ERSI | Environmental Remediation Services Inc |
| ERTE | Ertec, Inc. |
| ERTF | Engineering Research Task Force |
| ERW | Engine Rebuilders Warehouse |
| ES | Employment Services |
| ES | Engineering Science, Incorporated |
| ES | Ensemble Studios |
| ES | Epargne Salariale |
| ES | Evans Sutherland |
| ES | Evans & Sutherland |
| ESA | Eastern States Agency |
| ESAC | Employer Services Assurance Corporation |
| ESAF | Enhanced Structural Adjustment Facility |
| ESB | Elias Sports Bureau |