| Easter Seals Canada | Toronto Downtown North |
| Easter Seals Ontario, West Region - Halton Region District | Burlington |
| EFry Hope and Help for Women, Mississauga Office | Mississauga |
| Elections Canada, Wellington - Halton Hills North Electoral District, 2025 Federal Election | Halton Hills |
| Elections Canada, Burlington Electoral District, 2025 Federal Election | Burlington |
| Elections Canada, Burlington North - Milton West Electoral District, 2025 Federal Election | Milton |
| Elections Canada, Milton East - Halton Hills South Electoral District, 2025 Federal Election | Milton |
| Elections Canada, Oakville East Electoral District, 2025 Federal Election | Oakville |
| Elections Canada, Oakville West Electoral District, 2025 Federal Election | Oakville |
| eMentalHealth.ca | Ottawa |
| English Learners Club of Oakville, ESL Conversation Classes | Halton South |
| Epilepsy South Central Ontario, Mississauga | Mississauga |
| Equilibrium, Oakville, Mood Disorder Support Group | Oakville |
| ErinoakKids, Oakville Site, Centre for Treatment and Development | Oakville |
| ErinoakKids Centre for Treatment and Development, Children's Treatment Centre (Brampton) | Brampton |
| ErinoakKids Centre for Treatment and Development, Children's Treatment Centre (Mississauga) | 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 |
| Escudero Medical Centre | Oakville |
| Exam Proctoring, Halton Region | Halton Region |
