| Economics Student Organization | Academic & Science |
| Engineering Services Outsourcing | Academic & Science |
| Entomological Society of Ontario | Academic & Science |
| ECORD Science Operator | Academic & Science |
| Excel Sports Officiating | Business |
| Epe Special | Business |
| Ensemble Studios On-line | Community |
| Elgin Symphony Orchestra | Community |
| Earth Space Offensive | Community |
| Engine Shut Off | General |
| European Standards Organization | General |
| European Sport Option | General |
| Engineering Sign Off | General |
| Expanding Sociability Oppor | General |
| Equation Set Object | General |
| Escuela Secundaria Obligatoria | General |
| Epsilon Sigma Omicron | General |
| Elder Scrolls Online | General |
| enseñanza secundaria obligatoria | General |
| Edge Slot Orient | General |
| essentially surjective on | General |
| Ether Saga Odyssey | General |
| ense?nza secundaria obligatoria | General |
| Entrepreneur Support Organization | General |
| Ecological Services Outsourcing | General |
| Elders Scrolls Online | General |
| ESDIS Standards Office | General |
| Estimated Sign Off | General |
| Equipment Smarter Operator | General |
| Educacion Secundaria Obligatoria | General |
| Emergency Support Office | General |
| External Security Organisation | General |
| Erin Street Orphans | General |
| Environmentally Sustainable Objects | General |
| Esotericism Secret Theory | General |
| Equipment Superior To Operator | Governmental |
| Event Sequence Override | Governmental |
| Embarkation Staff Officer | Governmental |
| Environmental Science Officer | Governmental |
| Employee Stock Option | Governmental |
| Employee stock options | Governmental |
| European Standardization Organization | Governmental |
| Employment Services and Operations | Governmental |
| Employment Services Operations | Governmental |
| Environmental Student Organization | Governmental |
| Environmental Sciences Organization | Governmental |
| Educaci? Secundaria Obligatoria | International |
| Educación Secundaria Obligatoria | International |
| English Study Online | International |
| European School of Oncology | Medical |
| Evolutionary Structural Optimization | Medical |
| Espanola, New Mexico | Regional |
| European Southern Observatory | Regional |
| European School Oncology | Regional |
| European Standardization Organizations | Regional |
| European Semester Officer | Regional |
