| Abbreviation | Definition |
|---|---|
| Est. | established |
| ESTI | EMS Solutions Technology Incorporated |
| ESWF | Erie Shores Wind Farm |
| ESWI | Educational Solutions Worldwide Inc |
| ET | England Telecom |
| ET | Evening Times |
| ETA | Engineering Technology Associates |
| ETB | Empresa De Telecomunicaciones De Bogota |
| ETBW | Ev'ryting Taste Betta Wit |
| ETC | Ellerby Telephone Company |
| ETC | Etcetera Type Company |
| ETC | Evaluation Techniques Corporation |
| ETC | Everything Type Company |
| ETC | EverythingTypeCompany |
| ETC | Everything–Type–Company |
| ETC | Experimental Theatre Company |
| ETCA | Export Trading Company Affairs |
| ETCC | Electronic Transaction Consultants Corporation |
| ETCI | Expert Technical Consultants Inc |
| ETCL | Excelsior Trading Corporation Ltd |