| St. Clair West Services for Seniors | Other Public Sector Employers | 2016 | 1 | $100,373 |
| St. Demetrius (Ukrainian Catholic) Development Corporation | Other Public Sector Employers | 2011 | 3 | $111,457 |
| St. Demetrius Dev. Corporation | Other Public Sector Employers | 2003 | 1 | $110,001 |
| St. Demetrius Development Corporation | Other Public Sector Employers | 2005 | 1 | $110,001 |
| St. Francis Advocates for the Autistic & Developmentally Disabled (Sarnia) Inc. | Other Public Sector Employers | 2012 | 1 | $108,138 |
| St. Francis Advocates for the Autistic and Developmentally Disabled (Sarnia) Inc | Other Public Sector Employers | 2025 | 4 | $112,316 |
| St. Francis Memorial Hospital | Hospitals & Boards of Public Health | 2025 | 20 | $123,500 |
| St. Jerome's University | Universities | 2025 | 42 | $171,504 |
| St. John s Rehab Hospital | Hospitals & Boards of Public Health | 1999 | 2 | $143,216 |
| St. John's Rehab Hospital | Hospitals & Boards of Public Health | 2013 | 17 | $114,551 |
| St. John's Rehabilitation Hospital | Hospitals & Boards of Public Health | 2003 | 4 | $144,386 |
| St. Joseph Care Group | Hospitals & Boards of Public Health | 2002 | 4 | $146,697 |
| St. Joseph s Care Group | Hospitals & Boards of Public Health | 1999 | 1 | $132,142 |
| St. Joseph s Hospital & Home | Hospitals & Boards of Public Health | 1999 | 1 | $108,086 |
| St. Joseph's | Hospitals & Boards of Public Health | 2000 | 1 | $112,804 |
| St. Joseph's Care Group | Hospitals & Boards of Public Health | 2025 | 414 | $130,837 |
| St. Joseph's Care Grp, Thunder Bay | Hospitals & Boards of Public Health | 2001 | 3 | $121,674 |
| St. Joseph's Continuing Care Centre | Hospitals & Boards of Public Health | 2010 | 1 | $101,276 |
| St. Joseph's Continuing Care Centre of Sudbury | Hospitals & Boards of Public Health | 2025 | 32 | $126,273 |
| St. Joseph's Continuing Care Ctr. | Hospitals & Boards of Public Health | 2004 | 1 | $154,194 |
| St. Joseph's Gen. Hosp.,Elliot Lake | Hospitals & Boards of Public Health | 2002 | 2 | $110,051 |
| St. Joseph's General Hospital | Hospitals & Boards of Public Health | 2025 | 77 | $124,974 |
| St. Joseph's General Hospital, Elliot Lake | Hospitals & Boards of Public Health | 2003 | 1 | $112,168 |
| St. Joseph's General Hospital, Thunder Bay | Hospitals & Boards of Public Health | 1996 | 1 | $109,997 |
| St. Joseph's Health Care London | Hospitals & Boards of Public Health | 2025 | 1,050 | $129,677 |
| St. Joseph's Health Centre -Sarnia | Hospitals & Boards of Public Health | 1997 | 1 | $119,414 |
| St. Joseph's Health Centre Guelph | Hospitals & Boards of Public Health | 2025 | 88 | $124,699 |
| St. Joseph's Health Centre of Sarnia | Hospitals & Boards of Public Health | 1996 | 1 | $114,992 |
| St. Joseph's Health Centre, Toronto | Hospitals & Boards of Public Health | 2016 | 170 | $122,723 |
| St. Joseph's Healthcare Hamilton | Hospitals & Boards of Public Health | 2025 | 1,623 | $124,618 |
| St. Joseph's Hlth. Centre Guelph | Other Public Sector Employers | 2004 | 1 | $142,277 |
| St. Joseph's Home Care a member of St. Joseph's Health System | Other Public Sector Employers | 2012 | 1 | $109,866 |
| St. Joseph's Hosp. - Elliot Lake | Hospitals & Boards of Public Health | 2004 | 1 | $138,658 |
| St. Joseph's Hospital & Health Centre | Hospitals & Boards of Public Health | 1996 | 1 | $107,244 |
| St. Joseph's Hospital & Home | Hospitals & Boards of Public Health | 2000 | 2 | $115,365 |
| St. Joseph's Hospital & Home,Guelph | Hospitals & Boards of Public Health | 1997 | 2 | $117,533 |
| St. Joseph's Hospital Brantford | Hospitals & Boards of Public Health | 1998 | 1 | $112,806 |
| St. Joseph's Hospital, Chatham | Hospitals & Boards of Public Health | 1997 | 1 | $102,648 |
| St. Joseph's Lifecare Centre Brantford | Other Public Sector Employers | 2014 | 2 | $120,188 |
| St. Joseph's Villa | Other Public Sector Employers | 2006 | 1 | $167,800 |
| St. Joseph's Villa Dundas | Other Public Sector Employers | 2010 | 3 | $119,374 |
| St. Joseph's Villa Dundas owned & operated by St. Joseph's Health System | Other Public Sector Employers | 2013 | 2 | $111,018 |
| St. Joseph's Villa Dundas owned and operated by St. Joseph's Health System | Other Public Sector Employers | 2015 | 3 | $114,086 |
| St. Lawrence Centre | Municipalities & Services | 2004 | 1 | $143,290 |
| St. Lawrence Centre for the Arts | Other Public Sector Employers | 2000 | 1 | $103,000 |
| St. Lawrence Lodge | Other Public Sector Employers | 2011 | 2 | $108,815 |
| St. Lawrence Lodge Long Term Care Home | Other Public Sector Employers | 2015 | 8 | $107,003 |
| St. Lawrence Parks Commission | Crown Agencies | 2025 | 24 | $128,652 |
| St. Leonard's Community Services | Other Public Sector Employers | 2011 | 1 | $110,127 |
| St. Leonard's Community Services Inc. | Other Public Sector Employers | 2023 | 2 | $122,734 |
| St. Leonard's Community Support, Prevention and Residential Services | Other Public Sector Employers | 2025 | 1 | $130,654 |
| St. Leonard's Place, Peel | Other Public Sector Employers | 2012 | 1 | $108,356 |
| St. Mary s General Hosp.-Kitchener | Hospitals & Boards of Public Health | 1999 | 4 | $139,820 |
| St. Mary's Gen. Hospital, Kitchener | Hospitals & Boards of Public Health | 1998 | 4 | $145,098 |
| St. Mary's Home | Other Public Sector Employers | 2015 | 1 | $104,445 |
| St. Mary's of the Lake Hosp. -Kingston | Hospitals & Boards of Public Health | 1997 | 2 | $132,971 |
| St. Marys Memorial Hospital | Hospitals & Boards of Public Health | 1999 | 1 | $102,554 |
| St. Marys Public Library Board | Other Public Sector Employers | 2017 | 2 | $126,056 |
| St. Mary’s General Hospital | Hospitals & Boards of Public Health | 2024 | 438 | $124,605 |
| St. Michael's College | Universities | 2005 | 1 | $108,458 |
| St. Michael's Hospital | Hospitals & Boards of Public Health | 2016 | 455 | $126,648 |
| St. Paul's l'Amoreaux Centre | Other Public Sector Employers | 2016 | 1 | $130,089 |
| St. Peter's Health System | Other Public Sector Employers | 2005 | 3 | $127,142 |
| St. Peter's Hospital | Hospitals & Boards of Public Health | 2008 | 25 | $132,553 |
| St. Peter's Hospital, Hamilton | Hospitals & Boards of Public Health | 1997 | 2 | $133,494 |
| St. Peter's Seminary | Universities | 2025 | 4 | $147,245 |
| St. Peter’s Care Centres | Other Public Sector Employers | 2025 | 16 | $128,026 |
| St. Thomas Elgin General Hospital | Hospitals & Boards of Public Health | 2025 | 265 | $123,319 |
| Star Family Health Team | Other Public Sector Employers | 2023 | 2 | $106,919 |
| Status of Women | Government of Ontario – Ministries | 2018 | 13 | $121,343 |
| Stefanie Vander Slagt Physiotherapy Professional Corporation | Other Public Sector Employers | 2023 | 2 | $109,037 |
| Stella’s Place Assessment and Treatment Center | Other Public Sector Employers | 2020 | 2 | $123,293 |
| Stepping Stones Support Services Program | Other Public Sector Employers | 2025 | 1 | $104,399 |
| Stevenson Memorial Hospital | Hospitals & Boards of Public Health | 2025 | 71 | $122,770 |
| Stonegate Community Association | Other Public Sector Employers | 2025 | 6 | $233,109 |
| Stonegate Community Health Centre | Other Public Sector Employers | 2016 | 4 | $170,117 |
| Stonehenge Therapeutic Community | Other Public Sector Employers | 2025 | 6 | $118,065 |
| Storefront Humber Inc | Other Public Sector Employers | 2021 | 3 | $110,645 |
| Stormont Dundas and Glengarry Developmental Services Centre | Other Public Sector Employers | 2019 | 1 | $105,195 |
| Stormont, Dund. & Glen RCSSB | School Boards | 1997 | 1 | $108,652 |
| Stormont, Dundas & Glengarry BE | School Boards | 1997 | 3 | $105,173 |
| Stormont, Dundas & Glengarry Public School Board | School Boards | 1996 | 1 | $105,660 |
| Stormont, Dundas & Glengarry R.C.S.S.B. | School Boards | 1996 | 2 | $101,186 |
| Stratford Family Health Team | Other Public Sector Employers | 2023 | 1 | $109,243 |
| Stratford General Hospital | Hospitals & Boards of Public Health | 1999 | 4 | $123,036 |
| Strathroy | Hospitals & Boards of Public Health | 2001 | 1 | $122,474 |
| Strathroy Middlesex General Hosp. | Hospitals & Boards of Public Health | 2002 | 1 | $117,690 |
| Strathroy Middlesex General Hospital | Hospitals & Boards of Public Health | 2025 | 96 | $123,969 |
| Strathroy-Middlesex General | Hospitals & Boards of Public Health | 2004 | 1 | $146,656 |
| Street Haven at the Crossroads | Other Public Sector Employers | 2025 | 7 | $116,842 |
| Street Health Community Nursing Foundation | Other Public Sector Employers | 2025 | 4 | $117,650 |
| Strides Toronto Support Services | Other Public Sector Employers | 2025 | 18 | $133,420 |
| Student Transportation of Eastern Ontario | Other Public Sector Employers | 2013 | 2 | $123,543 |
| Sudbury and Area Victim Services | Other Public Sector Employers | 2025 | 1 | $110,782 |
| Sudbury Better Beginnings Better Futures Assoc | Other Public Sector Employers | 2025 | 1 | $116,744 |
| Sudbury Board of Education | School Boards | 1997 | 7 | $110,832 |
| Sudbury Catholic District School Board | School Boards | 2025 | 404 | $121,515 |
| Sudbury Community Service Centre | Other Public Sector Employers | 2025 | 1 | $121,663 |
| Sudbury Counselling Centre | Other Public Sector Employers | 2025 | 1 | $115,723 |
| Sudbury Developmental Services | Other Public Sector Employers | 2025 | 5 | $109,231 |