| Easter Seals Ontario, West Region - Halton Region District | Burlington |
| EFry Hope and Help for Women, Mississauga Office | Mississauga |
| eMentalHealth.ca | Ottawa |
| English Learners Club of Oakville, ESL Conversation Classes | Oakville |
| Epilepsy South Central Ontario | Mississauga |
| Equilibrium, Oakville, Mood Disorder Support Group | Oakville |
| ErinoakKids, Oakville site, Centre for Treatment and Development | Oakville |
| ErinoakKids Centre for Treatment and Development, ErinoakKids Centre for Treatment and Development, Brampton Office | Brampton |
| ErinoakKids Centre for Treatment and Development, Mississauga Office | Mississauga |
| Ernest C Drury School for the Deaf | Milton |
| Ernest C Drury School for the Deaf, Ontario Youth Apprenticeship Program | Milton |
| Ernestine's Women's Shelter | Toronto |
| Espace francophone de Halton | Halton Region |
| Exam Proctoring, Halton Region | Halton Region |
