| Educational Center for International Students | Academic & Science |
| European Colloid and Interface Society | Academic & Science |
| Eighteenth-Century Ireland Society | Academic & Science |
| Cumann Éire san Ochtú Céad Déag | Academic & Science |
| Cumann ?re san Ocht?C?d D?g | Academic & Science |
| Electric cell-substrate impedance sensing | Academic & Science |
| Electronic Course Instructor Surveys | Academic & Science |
| Engineering Careers Information Service | Business |
| Electrical Consulting and Inspection Services | Business |
| European Council of International Schools | Business |
| European Conference on Information Systems | Community |
| Educational Collaborative for International Schools | Community |
| Educator Credential Information System | Community |
| Educator Credentialing Information System | Community |
| Electronic Customer Information System | Computing |
| Eddy Current Inspection System | General |
| Elvis Costello Information Service | General |
| Emergency Contact Information System | General |
| Early Childhood Intervention Services | General |
| East Coast Induction Systems | General |
| Evaluaci? de la Calidad en Interpretaci? Simult?ea | General |
| Eindhoven Centre for Innovation Studies | General |
| Evaluación de la Calidad en Interpretación Simultánea | General |
| Early Childhood and Intervention Specialist | General |
| Early Childhood Information System | General |
| East Coast Industrial Services | General |
| Enterprise Cloud and Integration Service | General |
| Emergency Care Instruction Services | General |
| Enterprise Component Information System | General |
| Enterprise Component Integration System | General |
| E Commerce Interoperability Standard | Governmental |
| European Committee for Interoperable Systems | Regional |
| European Colloid Interface Society | Regional |
| Education Centers for Ibm Software | Softwares |