| Mon Sheong Foundation | Other Public Sector Employers | 2025 | 44 | $135,037 |
| Monarch Recovery Services | Other Public Sector Employers | 2025 | 1 | $137,229 |
| Monarch Recovery Services/services de retablissement | Other Public Sector Employers | 2015 | 1 | $104,581 |
| Montage Support Services | Other Public Sector Employers | 2025 | 6 | $122,335 |
| Montage Support Services of Toronto | Other Public Sector Employers | 2016 | 1 | $104,823 |
| Montfort | Hospitals & Boards of Public Health | 2000 | 4 | $134,031 |
| Montfort Renaissance Inc | Other Public Sector Employers | 2025 | 10 | $157,816 |
| Mood Disorders Association of Ontario and Toronto | Other Public Sector Employers | 2025 | 1 | $128,600 |
| Moose Cree First Nation | Other Public Sector Employers | 2024 | 2 | $113,095 |
| Moose Deer Point First Nation | Other Public Sector Employers | 2025 | 1 | $107,244 |
| Moose Factory Island District School Area Board | School Boards | 2025 | 3 | $139,268 |
| Moose Hide Campaign Development Society | Other Public Sector Employers | 2025 | 3 | $106,667 |
| Moosonee District School Area Board | School Boards | 2025 | 9 | $120,770 |
| Moosonee Roman Catholic Separate School Board | School Boards | 2008 | 1 | $105,886 |
| Mosaic Institute | Other Public Sector Employers | 2023 | 1 | $165,000 |
| Motherisk Commission | Crown Agencies | 2017 | 1 | $299,071 |
| Mount Forest Family Health Team Inc | Other Public Sector Employers | 2023 | 2 | $122,187 |
| Mount Nemo Christian Nursing Home | Other Public Sector Employers | 2024 | 1 | $103,867 |
| Mount Sinai Hospital | Hospitals & Boards of Public Health | 2014 | 252 | $155,872 |
| Moyo Health and Community Services | Other Public Sector Employers | 2025 | 1 | $113,623 |
| Muki Baum Assoc. | Other Public Sector Employers | 1997 | 1 | $110,000 |
| Muki Baum Assoc. for Rehabilitation | Other Public Sector Employers | 1998 | 1 | $110,000 |
| Muki Baum Association | Other Public Sector Employers | 2011 | 2 | $133,414 |
| Muki Baum Association for the Rehabilitation of Multi Handicapped Inc. | Other Public Sector Employers | 2013 | 1 | $125,000 |
| Muki Baum Association-North York | Other Public Sector Employers | 1999 | 1 | $111,662 |
| MukiBaum Association | Other Public Sector Employers | 2008 | 1 | $147,678 |
| Multicultural Council of Windsor and Essex County | Other Public Sector Employers | 2024 | 3 | $122,070 |
| Multilingual Community Interpreter Services | Other Public Sector Employers | 2015 | 1 | $127,622 |
| Multilingual Community Interpreter Services (MCIS) | Other Public Sector Employers | 2025 | 9 | $136,079 |
| Municipal Affairs and Housing | Government of Ontario – Ministries | 2025 | 303 | $139,122 |
| Municipal Affairs, Housing | Government of Ontario – Ministries | 2016 | 1 | $242,432 |
| Municipal Finance Officers Association | Other Public Sector Employers | 2025 | 9 | $160,038 |
| Municipal Finance Officers' Association of Ontario | Other Public Sector Employers | 2016 | 2 | $145,226 |
| Municipal Property Assessment Corporation | Other Public Sector Employers | 2025 | 594 | $128,620 |
| Municipality of Arran-Elderslie | Municipalities & Services | 2025 | 5 | $118,025 |
| Municipality of Bayham | Municipalities & Services | 2025 | 9 | $143,280 |
| Municipality of Bluewater | Municipalities & Services | 2025 | 8 | $142,899 |
| Municipality of Brighton | Municipalities & Services | 2025 | 24 | $129,355 |
| Municipality of Brockton | Municipalities & Services | 2025 | 8 | $140,472 |
| Municipality of Brooke-Alvinston | Municipalities & Services | 2025 | 1 | $111,179 |
| Municipality of Callander | Municipalities & Services | 2025 | 5 | $120,054 |
| Municipality of Calvin | Municipalities & Services | 2025 | 1 | $126,252 |
| Municipality of Carlington | Municipalities & Services | 1997 | 1 | $103,035 |
| Municipality of Casselman | Municipalities & Services | 2025 | 8 | $120,017 |
| Municipality of Central Elgin | Municipalities & Services | 2025 | 17 | $126,279 |
| Municipality of Central Huron | Municipalities & Services | 2025 | 7 | $121,006 |
| Municipality of Central Manitoulin | Municipalities & Services | 2025 | 3 | $112,656 |
| Municipality of Centre Hastings | Municipalities & Services | 2025 | 5 | $126,838 |
| Municipality of Chatham-Kent | Municipalities & Services | 2025 | 464 | $133,052 |
| Municipality of Clarington | Municipalities & Services | 2025 | 204 | $142,301 |
| Municipality of Dutton–Dunwich | Municipalities & Services | 2025 | 3 | $106,420 |
| Municipality of Dysart et al | Municipalities & Services | 2025 | 9 | $134,247 |
| Municipality of East Ferris | Municipalities & Services | 2025 | 3 | $161,429 |
| Municipality of Faraday | Municipalities & Services | 2025 | 3 | $108,944 |
| Municipality of French River | Municipalities & Services | 2025 | 6 | $119,818 |
| Municipality of Gordon/Barrie Island | Municipalities & Services | 2025 | 1 | $105,000 |
| Municipality of Greenstone | Municipalities & Services | 2025 | 7 | $130,189 |
| Municipality of Grey Highlands | Municipalities & Services | 2025 | 10 | $133,914 |
| Municipality of Hastings Highlands | Municipalities & Services | 2025 | 6 | $120,960 |
| Municipality of Highlands East | Municipalities & Services | 2025 | 8 | $116,146 |
| Municipality of Huron East | Municipalities & Services | 2025 | 7 | $119,076 |
| Municipality of Huron Shores | Municipalities & Services | 2025 | 1 | $116,428 |
| Municipality of Killarney | Municipalities & Services | 2025 | 1 | $129,632 |
| Municipality of Kincardine | Municipalities & Services | 2025 | 24 | $135,035 |
| Municipality of Lambton Shores | Municipalities & Services | 2025 | 6 | $141,795 |
| Municipality of Leamington | Municipalities & Services | 2025 | 69 | $126,517 |
| Municipality of Leamington - Police | Municipalities & Services | 2005 | 2 | $105,528 |
| Municipality of Leamington, Police Services Board | Municipalities & Services | 2006 | 2 | $114,667 |
| Municipality of Magnetawan | Municipalities & Services | 2025 | 4 | $122,680 |
| Municipality of Markstay-Warren | Municipalities & Services | 2024 | 1 | $119,549 |
| Municipality of Marmora and Lake | Municipalities & Services | 2025 | 5 | $114,449 |
| Municipality of McDougall | Municipalities & Services | 2025 | 8 | $129,854 |
| Municipality of Meaford | Municipalities & Services | 2025 | 13 | $116,708 |
| Municipality of Middlesex Centre | Municipalities & Services | 2025 | 18 | $130,697 |
| Municipality of Mississippi Mills | Municipalities & Services | 2025 | 16 | $130,907 |
| Municipality of Morris-Turnberry | Municipalities & Services | 2025 | 4 | $131,570 |
| Municipality of Neebing | Municipalities & Services | 2025 | 1 | $109,958 |
| Municipality of North Grenville | Municipalities & Services | 2025 | 19 | $128,545 |
| Municipality of North Middlesex | Municipalities & Services | 2025 | 5 | $131,561 |
| Municipality of North Perth | Municipalities & Services | 2025 | 34 | $127,312 |
| Municipality of Northern Bruce Peninsula | Municipalities & Services | 2025 | 7 | $136,629 |
| Municipality of Oliver Paipoonge | Municipalities & Services | 2025 | 5 | $130,858 |
| Municipality of Pickering | Municipalities & Services | 1999 | 3 | $103,268 |
| Municipality of Port Hope | Municipalities & Services | 2025 | 37 | $125,788 |
| Municipality of Port Hope Police Services Board | Municipalities & Services | 2025 | 22 | $134,715 |
| Municipality of Port Hope Public Library Board | Municipalities & Services | 2025 | 1 | $130,008 |
| Municipality of Powassan | Municipalities & Services | 2025 | 1 | $108,522 |
| Municipality of Red Lake | Municipalities & Services | 2025 | 6 | $120,891 |
| Municipality of Shuniah | Municipalities & Services | 2025 | 3 | $130,254 |
| Municipality of Sioux Lookout | Municipalities & Services | 2025 | 16 | $131,751 |
| Municipality of South Bruce | Municipalities & Services | 2025 | 3 | $132,932 |
| Municipality of South Dundas | Municipalities & Services | 2025 | 8 | $122,851 |
| Municipality of South Huron | Municipalities & Services | 2025 | 16 | $127,854 |
| Municipality of Southwest Middlesex | Municipalities & Services | 2025 | 5 | $133,415 |
| Municipality of Temagami | Municipalities & Services | 2025 | 2 | $131,578 |
| Municipality of Thames Centre | Municipalities & Services | 2025 | 13 | $134,205 |
| Municipality of Trent Hills | Municipalities & Services | 2025 | 12 | $123,361 |
| Municipality of Trent Lakes | Municipalities & Services | 2025 | 9 | $128,449 |
| Municipality of Tweed | Municipalities & Services | 2025 | 1 | $102,914 |
| Municipality of Wawa | Municipalities & Services | 2025 | 3 | $135,054 |