| Hospice Wellington | Other Public Sector Employers | 2022 | 2 | $117,657 |
| Hospital Administrative Services | Hospitals & Boards of Public Health | 2006 | 3 | $349,104 |
| Hospital Administrative Services/Plexxus | Other Public Sector Employers | 2006 | 3 | $180,690 |
| Hospital Diagnostic Imaging Repository | Other Public Sector Employers | 2016 | 7 | $134,084 |
| Hospital Diagnostic Imaging Repository Services | Other Public Sector Employers | 2013 | 5 | $147,013 |
| Hospital for Sick Children | Hospitals & Boards of Public Health | 2025 | 2,249 | $139,144 |
| Hotel Dieu Health Sci. Hosp., Niagara | Hospitals & Boards of Public Health | 2004 | 5 | $157,955 |
| Hotel Dieu Hlth Sci. Hosp., Niagara | Hospitals & Boards of Public Health | 2002 | 4 | $151,392 |
| Hotel Dieu Hospital | Hospitals & Boards of Public Health | 2016 | 33 | $130,282 |
| Hotel Dieu Hospital , St. Catherines | Hospitals & Boards of Public Health | 1999 | 1 | $192,119 |
| Hotel Dieu Hospital, St. Catharines | Hospitals & Boards of Public Health | 1998 | 1 | $153,940 |
| Hotel Dieu Shaver Hlth. & Rehab. Ctr. | Hospitals & Boards of Public Health | 2005 | 3 | $148,361 |
| Hotel-Dieu Grace Hosp., Windsor | Hospitals & Boards of Public Health | 1998 | 1 | $164,496 |
| Hotel-Dieu Grace Hospital, St. Catharines | Hospitals & Boards of Public Health | 1996 | 1 | $141,492 |
| Hotel-Dieu Grace Hospital, Windsor | Hospitals & Boards of Public Health | 1997 | 1 | $164,496 |
| Hotel-Dieu Hospital, Cornwall | Hospitals & Boards of Public Health | 1997 | 1 | $131,508 |
| House of Friendship | Other Public Sector Employers | 2025 | 6 | $129,797 |
| House of Sophrosyne | Other Public Sector Employers | 2025 | 1 | $146,994 |
| Houselink Community Homes | Other Public Sector Employers | 2020 | 1 | $120,000 |
| Hq Health Hub | Other Public Sector Employers | 2025 | 3 | $165,541 |
| htx.ca - The Health Technology Exchange | Other Public Sector Employers | 2016 | 2 | $174,423 |
| HUCCHC | Other Public Sector Employers | 2005 | 2 | $121,771 |
| Human Rights Legal Support Centre | Crown Agencies | 2025 | 11 | $124,232 |
| Human Rights Tribunal of Ontario | Crown Agencies | 2023 | 19 | $128,496 |
| Humana Community Services | Other Public Sector Employers | 2025 | 1 | $145,000 |
| Humber College Institute of Technology and Advanced Learning | Colleges | 2025 | 1,096 | $130,812 |
| Humber Meadows Long-Term Care Home | Other Public Sector Employers | 2025 | 14 | $114,105 |
| Humber Regional River Hospital | Hospitals & Boards of Public Health | 2003 | 1 | $110,986 |
| Humber River Family Health Team | Other Public Sector Employers | 2023 | 2 | $112,735 |
| Humber River Health | Hospitals & Boards of Public Health | 2025 | 1,383 | $126,597 |
| Huntington University | Universities | 2020 | 8 | $145,801 |
| Huntsville District | Hospitals & Boards of Public Health | 2002 | 1 | $128,421 |
| Huntsville District Memorial | Hospitals & Boards of Public Health | 2004 | 1 | $138,597 |
| Huntsville District Memorial Hospital | Hospitals & Boards of Public Health | 2000 | 1 | $118,464 |
| Huntsville District Nursing Home Inc | Other Public Sector Employers | 2022 | 2 | $105,892 |
| Huron Community Family Health Team | Other Public Sector Employers | 2022 | 1 | $100,472 |
| Huron County BE | School Boards | 1997 | 1 | $108,656 |
| Huron County Board of Education | School Boards | 1996 | 1 | $107,789 |
| Huron County Health Unit | Hospitals & Boards of Public Health | 2011 | 3 | $167,373 |
| Huron Lodge Community Service Board Inc | Other Public Sector Employers | 2025 | 2 | $147,448 |
| Huron Perth Catholic District School Board | School Boards | 2005 | 6 | $118,109 |
| Huron Perth Healthcare Alliance | Hospitals & Boards of Public Health | 2025 | 312 | $126,313 |
| Huron Perth Hospitals Partnership | Hospitals & Boards of Public Health | 2003 | 4 | $161,934 |
| Huron Shores Family Health Team | Other Public Sector Employers | 2023 | 2 | $125,502 |
| Huron University College | Universities | 2025 | 85 | $142,073 |
| Huron-Perth Catholic District School Board | School Boards | 2025 | 229 | $123,381 |
| Huron-Perth Centre for Children and Youth | Other Public Sector Employers | 2025 | 2 | $113,822 |
| Huron-Perth Children's Aid Society | Other Public Sector Employers | 2025 | 17 | $128,716 |
| Huron-Perth County RCSSB | School Boards | 1997 | 2 | $108,974 |
| Huron-Superior Catholic District School Board | School Boards | 2025 | 284 | $121,981 |
| Huronia District Hospital | Hospitals & Boards of Public Health | 2008 | 2 | $104,411 |
| Huronia Nurse Pracititioner Led Clinic | Other Public Sector Employers | 2023 | 4 | $123,974 |
| Huronia Nurse Practitioner-Led Clinic | Other Public Sector Employers | 2016 | 1 | $103,431 |
| Huronia Nurse Practitioner–Led Clinic | Other Public Sector Employers | 2015 | 1 | $106,276 |
| Huronia Transition Homes | Other Public Sector Employers | 2025 | 2 | $121,896 |
| Hydro One | Hydro One and Ontario Power Generation | 2014 | 4,279 | $128,574 |
| Hydro One Brampton Networks Inc. | Hydro One and Ontario Power Generation | 2014 | 70 | $127,133 |
| Hôpital de Mattawa Hospital Inc. | Hospitals & Boards of Public Health | 2025 | 28 | $131,928 |
| Hôpital de Smooth Rock Falls Hospital | Hospitals & Boards of Public Health | 2016 | 2 | $131,435 |
| Hôpital du district de Geraldton | Hospitals & Boards of Public Health | 2007 | 4 | $113,969 |
| Hôpital général de Hawkesbury & Dist. Gen. Hosp | Hospitals & Boards of Public Health | 2006 | 4 | $127,500 |
| Hôpital Montfort | Hospitals & Boards of Public Health | 2025 | 567 | $127,736 |
| Hôpital Notre-dame Hospital (Hearst) | Hospitals & Boards of Public Health | 2025 | 33 | $126,748 |
| Hôtel-Dieu Grace Healthcare | Hospitals & Boards of Public Health | 2025 | 260 | $122,566 |