| Electronically Controlled Air Suspension | Academic & Science |
| East Cascades Audubon Society | Academic & Science |
| Electronic Course Authorization System | Academic & Science |
| ENES Climate Analytics Service | Academic & Science |
| Exploring Clouds for Acceleration of Science | Academic & Science |
| Electronic Course Action System | Academic & Science |
| Ecologically Conscious Architectural Studio | Academic & Science |
| Ethics Compliance and Audit Services | Business |
| Enterprise Cost Accounting System | Business |
| Embracing Children Adoption Services | Community |
| Emergency Committee of Atomic Scientists | Community |
| Executive Committee of the Academic Senate | Community |
| Electrical Cable Assembly Set | Computing |
| E-Commerce Association of Singapore | Computing |
| Ecole Cartoucherie Animation Solidier | General |
| Emirates Conformity Assessment Scheme | General |
| East Coast Aviation Supply | General |
| Eight-Color Asteroid Survey | General |
| Emirates Conformity Assessment System | General |
| EOIR Courts Appeals System | General |
| East County Animal Shelter | General |
| Experiment Computer Application Software | Governmental |
| Environmental Compliance Assessment System | Governmental |
| European Cancer Anaemia Survey | Medical |
| European Commission Authentication Service | Regional |
| European Cardiac Arrhythmia Society | Regional |
| European Commission Authentication System | Regional |
| European Conference on African Studies | Regional |
| European Cities of Advanced Sound | Regional |
| European Car Auction System | Regional |
| European Children Adoption Services | Regional |
| Electronic Client Application Status | Regional |
| European Citizen Action Service | Regional |
| Europe Conflict and Security | Regional |
| European Citizen Advice Service | Regional |