| Abbreviation | Definition |
|---|---|
| ERF | Earliest Reservation First |
| ERL | Electronic Reference Library |
| ERS | Enterprise Reporting System |
| ERS | Errors Party |
| ERSPAN | Encapsulated Remote Switched Port Analyzer |
| ERTM | Enhanced Retransmission Mode |
| ERV | Extended Remote Viewing |
| ES | Enterprise Solution |
| ESA | Enterprise Service Automation |
| ESA | Enterprise System Architecture |
| ESA | Enterprise Systems Architecture |
| ESD | End of Stream Delimiter |
| ESF | Extended Super Frame |
| ESH | End System Hello |
| ESJP | Engineering Social Justice and Peace |
| ESMTP | Extended Simple Mail Transfer Protocol |
| ESN | Enterprise Storage Network |
| ESN | European Singularity Network |
| ESP | Encryption Security Protocol |
| ESP | Enhanced Synchronization Protocol |