| Sound Times Support Services of Metropolitan Toronto | Other Public Sector Employers | 2016 | 1 | $100,822 |
| South Algonquin Family Health Team | Other Public Sector Employers | 2023 | 1 | $122,178 |
| South Asian Autism Awareness Centre | Other Public Sector Employers | 2025 | 1 | $170,000 |
| South Bruce Grey Health Centre | Hospitals & Boards of Public Health | 2025 | 95 | $132,060 |
| South Bruce Grey Hospital | Hospitals & Boards of Public Health | 2002 | 1 | $137,495 |
| South Coast Wellness Addictions and Mental Health | Other Public Sector Employers | 2025 | 5 | $129,544 |
| South East Community Care Access Centre | Other Public Sector Employers | 2016 | 24 | $120,589 |
| South East Toronto Family Health Team | Other Public Sector Employers | 2023 | 4 | $133,800 |
| South Essex Community Council | Other Public Sector Employers | 2025 | 1 | $127,806 |
| South Georgian Bay Community Health | Other Public Sector Employers | 2011 | 3 | $197,237 |
| South Georgian Bay Community Health Centre | Other Public Sector Employers | 2016 | 1 | $113,428 |
| South Georgian Bay Community Health Centres | Other Public Sector Employers | 2025 | 4 | $177,786 |
| South Grey Bruce Health Centre | Hospitals & Boards of Public Health | 2001 | 1 | $146,389 |
| South Huron Hospital | Hospitals & Boards of Public Health | 2025 | 21 | $125,114 |
| South Muskoka Memorial Hosp. | Hospitals & Boards of Public Health | 2004 | 2 | $124,114 |
| South Muskoka Memorial Hospital | Hospitals & Boards of Public Health | 2002 | 1 | $135,000 |
| South Nation River Conservation Authority | Other Public Sector Employers | 2013 | 1 | $142,528 |
| South Oshawa Comm. Health Centre | Other Public Sector Employers | 1997 | 1 | $123,119 |
| South Riverdale CHC | Other Public Sector Employers | 2005 | 2 | $115,364 |
| South Riverdale Comm. Health Cent. | Other Public Sector Employers | 1998 | 1 | $119,895 |
| South Riverdale Community Health Centre | Other Public Sector Employers | 2025 | 25 | $160,305 |
| South Simcoe Police Service | Municipalities & Services | 2025 | 106 | $135,897 |
| South West Centre for Community Program Development | Other Public Sector Employers | 2016 | 1 | $128,409 |
| South West Centre for Community Programme Development | Other Public Sector Employers | 2024 | 3 | $126,133 |
| South West Community Care Access Centre | Other Public Sector Employers | 2016 | 39 | $123,834 |
| South-East Grey Community Health Centre | Other Public Sector Employers | 2025 | 15 | $152,795 |
| South-East Grey Support Services | Other Public Sector Employers | 2025 | 3 | $124,594 |
| South-East Ottawa Centre | Other Public Sector Employers | 2005 | 1 | $121,268 |
| South-East Ottawa Community Centre | Other Public Sector Employers | 2016 | 6 | $130,070 |
| South-East Ottawa Community Services | Other Public Sector Employers | 2025 | 15 | $156,656 |
| Southeastern Ont. Health Sci. Centre | Other Public Sector Employers | 1998 | 1 | $105,281 |
| Southeastern Ont. Hlth Sciences Ctr | Hospitals & Boards of Public Health | 1999 | 1 | $101,627 |
| Southern Ontario Library Service | Other Public Sector Employers | 2020 | 3 | $137,452 |
| Southern Ontario Library Services | Municipalities & Services | 2005 | 1 | $110,349 |
| Southheastern Ont. Health Sciences Centre | Other Public Sector Employers | 1997 | 1 | $101,627 |
| Southlake Family Health Team | Other Public Sector Employers | 2023 | 4 | $110,544 |
| Southlake Health | Hospitals & Boards of Public Health | 2025 | 1,219 | $128,965 |
| Southlake Residential Care Village | Other Public Sector Employers | 2025 | 21 | $118,180 |
| Southwest Centre for Community Program Development | Other Public Sector Employers | 2014 | 1 | $115,346 |
| Southwest Centre for Community Programme Development | Other Public Sector Employers | 2009 | 1 | $104,560 |
| Southwest Ontario Aboriginal Health Access Centre | Other Public Sector Employers | 2016 | 4 | $145,573 |
| Southwest Ontario Aboriginal Health Access Centre (SOAHAC) | Other Public Sector Employers | 2025 | 20 | $143,349 |
| Southwest Ontario Tourism Corporation | Other Public Sector Employers | 2025 | 1 | $123,327 |
| Southwestern Integrated Fibre Technology Inc | Other Public Sector Employers | 2025 | 5 | $146,939 |
| Southwestern Ontario Aboriginal Health Access Centre | Other Public Sector Employers | 2010 | 2 | $256,082 |
| South–East Ottawa Community Health Centre | Other Public Sector Employers | 2012 | 5 | $136,613 |
| Soy 20/20 Project | Other Public Sector Employers | 2012 | 1 | $178,000 |
| Spark Commercialization and Innovation Centre | Other Public Sector Employers | 2025 | 1 | $107,290 |
| Special Investigations Unit | Crown Agencies | 2025 | 18 | $192,112 |
| Species at Risk Conservation Trust (Species Conservation Action Agency) | Crown Agencies | 2025 | 1 | $197,469 |
| Speech and Stuttering Institute | Other Public Sector Employers | 2025 | 1 | $121,871 |
| Spencer House Inc | Other Public Sector Employers | 2025 | 1 | $119,388 |
| Spinal Cord Injury Ontario | Other Public Sector Employers | 2025 | 4 | $120,811 |
| Sport | Government of Ontario – Ministries | 2025 | 38 | $146,508 |
| Sport Alliance | Other Public Sector Employers | 2000 | 1 | $106,001 |
| Sport Alliance of Ontario | Other Public Sector Employers | 2010 | 2 | $126,971 |
| Sport Alliance Ontario | Other Public Sector Employers | 2011 | 1 | $136,784 |
| Sprinkler Fitters of Ontario UA Local 853 | Other Public Sector Employers | 2025 | 7 | $153,737 |
| SPRINT Senior Care | Other Public Sector Employers | 2014 | 2 | $121,056 |
| Sprint Senior People's Resources in North Toronto | Other Public Sector Employers | 2025 | 7 | $163,907 |
| Spruce Lodge Home for the Aged | Other Public Sector Employers | 2025 | 10 | $126,005 |
| Sr Peoples' Resources in N. Toronto Inc | Other Public Sector Employers | 2004 | 1 | $112,523 |
| Sr. Peoples' Resources in North Toronto | Other Public Sector Employers | 2005 | 1 | $101,763 |
| Srvcs, Couns. Hearst-Kapuskasing-Smooth Rock Falls | Other Public Sector Employers | 2008 | 1 | $105,501 |
| SSM&D Group Health Association | Other Public Sector Employers | 2000 | 2 | $170,152 |
| St Alban's Boys' and Girls' Club | Other Public Sector Employers | 2025 | 2 | $138,364 |
| St Andrew’s Residence Chatham Inc | Other Public Sector Employers | 2021 | 1 | $101,290 |
| St Catharines Mainstream Non-profit Housing Project | Other Public Sector Employers | 2024 | 1 | $143,942 |
| St Christopher House | Other Public Sector Employers | 2025 | 2 | $124,253 |
| St Clair Child and Youth Services | Other Public Sector Employers | 2025 | 6 | $117,732 |
| St Clair College of Applied Arts and Technology | Colleges | 2025 | 314 | $129,985 |
| St Clair O'Connor Community Inc | Other Public Sector Employers | 2025 | 5 | $112,484 |
| St Clair Region Conservation Authority | Other Public Sector Employers | 2024 | 4 | $116,873 |
| St Hilda’s Towers Inc | Other Public Sector Employers | 2020 | 1 | $108,958 |
| St John Council for Ontario | Other Public Sector Employers | 2025 | 11 | $133,331 |
| St John's Retirement Homes | Other Public Sector Employers | 2023 | 1 | $114,600 |
| St Joseph's at Fleming | Other Public Sector Employers | 2025 | 11 | $126,088 |
| St Joseph's Health Care Dundas | Other Public Sector Employers | 2025 | 79 | $124,463 |
| St Joseph's Health Centre of Sudbury | Other Public Sector Employers | 2025 | 27 | $124,826 |
| St Joseph's Home Care | Other Public Sector Employers | 2025 | 7 | $117,261 |
| St Joseph's Infirmary | Other Public Sector Employers | 2025 | 7 | $127,057 |
| St Joseph's Lifecare Centre | Other Public Sector Employers | 2025 | 12 | $110,412 |
| St Joseph's – Hospice of London | Other Public Sector Employers | 2025 | 2 | $122,786 |
| St Jude Community Homes | Other Public Sector Employers | 2025 | 1 | $114,055 |
| St Lawrence College of Applied Arts and Technology | Colleges | 2025 | 263 | $126,933 |
| St Lawrence River Institute of Environmental Sciences | Other Public Sector Employers | 2025 | 1 | $116,487 |
| St Lawrence Youth Association | Other Public Sector Employers | 2025 | 2 | $136,243 |
| St Leonard's Society of London | Other Public Sector Employers | 2025 | 2 | $160,292 |
| St Matthew's Bracondale House | Other Public Sector Employers | 2025 | 1 | $109,439 |
| St Matthew's Harmony House | Other Public Sector Employers | 2025 | 1 | $105,945 |
| St Matthew’s House | Other Public Sector Employers | 2024 | 1 | $106,401 |
| St Michael's Homes | Other Public Sector Employers | 2025 | 1 | $140,265 |
| St Patrick's Home of Ottawa | Other Public Sector Employers | 2025 | 16 | $116,565 |
| St Stephen’s Community House | Other Public Sector Employers | 2020 | 2 | $134,375 |
| St Thomas Economic Development Corporation | Other Public Sector Employers | 2025 | 2 | $161,551 |
| St. Catharines | Hospitals & Boards of Public Health | 1999 | 1 | $106,759 |
| St. Catharines General Hospital | Hospitals & Boards of Public Health | 1999 | 6 | $145,615 |
| St. Clair | Colleges | 1997 | 1 | $119,214 |
| St. Clair Catholic District School Board | School Boards | 2025 | 463 | $125,442 |
| St. Clair Child & Youth Services | Other Public Sector Employers | 2013 | 1 | $114,166 |