| I B E W Local 804 Members Building Corporation | Other Public Sector Employers | 2025 | 3 | $137,221 |
| I B E W Local Union 353 | Other Public Sector Employers | 2025 | 10 | $137,060 |
| Ibew 402 Training and Education Centre | Other Public Sector Employers | 2025 | 1 | $145,737 |
| Ican Independence Centre and Network | Other Public Sector Employers | 2025 | 1 | $126,781 |
| ICES (Institute for Clinical Evaluative Sciences) | Other Public Sector Employers | 2025 | 104 | $138,419 |
| Iclei - Local Governments for Sustainability (Management) Inc | Other Public Sector Employers | 2024 | 2 | $149,033 |
| Idlewyld Manor | Other Public Sector Employers | 2025 | 20 | $132,231 |
| iGaming Ontario | Crown Agencies | 2025 | 60 | $160,515 |
| Ignite Behaviour Consulting Inc | Other Public Sector Employers | 2025 | 1 | $108,938 |
| IISD Experimental Lakes Area Inc | Other Public Sector Employers | 2025 | 7 | $134,276 |
| Imagine Canada | Other Public Sector Employers | 2012 | 4 | $149,124 |
| Immigrant Access Fund of Canada | Other Public Sector Employers | 2018 | 2 | $166,559 |
| Immigrant Access Fund of Canada Inc. | Other Public Sector Employers | 2016 | 1 | $125,000 |
| Immigrant Women Services Ottawa | Other Public Sector Employers | 2025 | 1 | $120,382 |
| In Community | Other Public Sector Employers | 2013 | 1 | $124,283 |
| Ina Grafton Gage Home | Other Public Sector Employers | 2010 | 1 | $108,215 |
| Ina Grafton Gage Home Toronto | Other Public Sector Employers | 2025 | 4 | $121,493 |
| Inclusion Northumberland | Other Public Sector Employers | 2025 | 4 | $103,601 |
| Independent Electricity System Operator | Crown Agencies | 2025 | 1,002 | $160,215 |
| Independent First Nations Alliance | Other Public Sector Employers | 2025 | 27 | $144,434 |
| Independent Living Centre of Waterloo Region | Other Public Sector Employers | 2025 | 1 | $148,781 |
| Independent Living Services of Simcoe County and Area | Other Public Sector Employers | 2025 | 4 | $115,736 |
| Independent Order of Odd Fellows Seniors Homes Inc. | Other Public Sector Employers | 2012 | 3 | $128,122 |
| Independent Police Review Office | Crown Agencies | 2008 | 2 | $173,945 |
| India Rainbow Community Services of Peel | Other Public Sector Employers | 2015 | 1 | $119,170 |
| Indian Agricultural Program of Ontario | Other Public Sector Employers | 2022 | 1 | $124,736 |
| Indian Associations Coordinating Committee of Ontario Inc | Other Public Sector Employers | 2025 | 5 | $106,607 |
| Indigenous Advanced Education and Skills Council | Other Public Sector Employers | 2025 | 5 | $152,380 |
| Indigenous Affairs and First Nations Economic Reconciliation | Government of Ontario – Ministries | 2025 | 110 | $139,182 |
| Indigenous Diabetes Health Circle | Other Public Sector Employers | 2025 | 3 | $123,252 |
| Indigenous Institutes Consortium | Other Public Sector Employers | 2025 | 1 | $214,500 |
| Indigenous Primary Health Care Council | Other Public Sector Employers | 2025 | 4 | $136,894 |
| Indigenous Sport & Wellness Ontario | Other Public Sector Employers | 2025 | 2 | $111,492 |
| Indoc Research | Other Public Sector Employers | 2023 | 5 | $143,590 |
| Indspire | Other Public Sector Employers | 2020 | 4 | $130,603 |
| Indus Community Services | Other Public Sector Employers | 2025 | 9 | $131,379 |
| Industry Education Council of Hamilton | Other Public Sector Employers | 2024 | 1 | $100,626 |
| Indwell Community Homes | Other Public Sector Employers | 2025 | 11 | $123,871 |
| Information & Communications Technology Council | Other Public Sector Employers | 2013 | 3 | $136,060 |
| Information and Communications Technology Council (ICTC) Ottawa | Other Public Sector Employers | 2016 | 4 | $134,026 |
| Information and Communications Technology Council Ottawa | Other Public Sector Employers | 2014 | 3 | $138,566 |
| Information and Privacy Commissioner | Government of Ontario – Legislative Assembly and Offices | 2025 | 118 | $150,515 |
| Infrastructure | Government of Ontario – Ministries | 2025 | 275 | $139,339 |
| Infrastructure Health and Safety Association | Other Public Sector Employers | 2025 | 114 | $132,038 |
| Ingamo Family Homes (Woodstock) Inc | Other Public Sector Employers | 2024 | 1 | $105,000 |
| Ingersoll Nurse Practitioner-Led Clinic | Other Public Sector Employers | 2023 | 3 | $122,148 |
| Ingersoll Support Services Inc | Other Public Sector Employers | 2025 | 1 | $122,105 |
| Inner City Family Health Team | Other Public Sector Employers | 2023 | 2 | $123,113 |
| Innovation Factory | Other Public Sector Employers | 2025 | 5 | $153,562 |
| Innovation Guelph | Other Public Sector Employers | 2016 | 2 | $105,100 |
| Innovation Guelph Resource Centre | Other Public Sector Employers | 2023 | 1 | $164,798 |
| Innovation Initiatives Ontario North | Other Public Sector Employers | 2025 | 1 | $124,240 |
| Innovation Institute of Ontario | Other Public Sector Employers | 2006 | 3 | $132,095 |
| Innovative Community Support Services | Other Public Sector Employers | 2025 | 8 | $146,610 |
| Inspire Community Support Services | Other Public Sector Employers | 2025 | 1 | $138,698 |
| Inst. for Clinical & Evaluative Studies | Other Public Sector Employers | 2000 | 3 | $114,037 |
| Institute for Advancements in Mental Health | Other Public Sector Employers | 2021 | 1 | $140,002 |
| Institute for Clinical Evaluation | Other Public Sector Employers | 2002 | 4 | $111,485 |
| Institute for Competitiveness and Prosperity | Other Public Sector Employers | 2018 | 2 | $101,676 |
| Institute for Safe Medication Practices Canada | Other Public Sector Employers | 2015 | 4 | $154,088 |
| Institute for Space and Terrestrial Science | Crown Agencies | 1996 | 1 | $119,656 |
| Institute for Space/Terrestrial Sci. | Crown Agencies | 1997 | 1 | $151,367 |
| Institute for Work and Health | Other Public Sector Employers | 2025 | 17 | $138,777 |
| Integra Foundation | Other Public Sector Employers | 2013 | 2 | $116,663 |
| Integrity Commission | Government of Ontario – Legislative Assembly and Offices | 2005 | 1 | $154,814 |
| Integrity Commissioner | Government of Ontario – Legislative Assembly and Offices | 2025 | 14 | $144,285 |
| Intellectual Property Ontario | Crown Agencies | 2025 | 17 | $148,139 |
| Interactive Niagara Media Cluster | Other Public Sector Employers | 2016 | 1 | $144,028 |
| Interactive Niagara Media Cluster (o/a NGEN) | Other Public Sector Employers | 2025 | 2 | $123,943 |
| Interactive Ontario Industry Association | Other Public Sector Employers | 2025 | 1 | $169,388 |
| Intergovernmental Affairs | Government of Ontario – Ministries | 2007 | 10 | $142,275 |
| Interim Place | Other Public Sector Employers | 2021 | 2 | $127,286 |
| Interior Finishing Systems Training Centre | Other Public Sector Employers | 2025 | 12 | $133,621 |
| International Association of Bridge Structural and Ornamental Iron Workers | Other Public Sector Employers | 2025 | 2 | $133,122 |
| International Association of Bridge, Structural, Ornamental & Reinforcing Iron Workers Local 759 | Other Public Sector Employers | 2025 | 2 | $165,322 |
| International Association of Bridge, Structural, Ornamental and Reinforcing Irownworkers Local 700 | Other Public Sector Employers | 2016 | 1 | $132,269 |
| International Association of Heat & Frost Insulators and Allied Workers Local 95 | Other Public Sector Employers | 2015 | 1 | $109,431 |
| International Association of Heat and Frost Insulators and Asbestos (Allied) Workers Local 95 | Other Public Sector Employers | 2025 | 3 | $138,630 |
| International Brotherhood of Boilermakers | Other Public Sector Employers | 2025 | 1 | $194,792 |
| International Brotherhood of Electrical Workers Local 105 Home Association Inc | Other Public Sector Employers | 2025 | 4 | $137,032 |
| International Brotherhood of Electrical Workers Local 1687 | Other Public Sector Employers | 2024 | 3 | $135,905 |
| International Trade | Government of Ontario – Ministries | 2018 | 47 | $126,806 |
| International Trade & Investment | Government of Ontario – Ministries | 2008 | 23 | $124,247 |
| International Union of Operating Engineers | Other Public Sector Employers | 2025 | 38 | $152,458 |
| Interval House | Other Public Sector Employers | 2025 | 2 | $142,321 |
| Interval House of Hamilton | Other Public Sector Employers | 2025 | 1 | $130,417 |
| Interval House of Ottawa-Maison Interval d'Ottawa | Other Public Sector Employers | 2025 | 1 | $116,835 |
| Interwoven Connections | Other Public Sector Employers | 2025 | 4 | $113,656 |
| Inuuqatigiit Centre for Inuit Children, Youth and Families | Other Public Sector Employers | 2025 | 4 | $114,116 |
| Invasive Species Centre | Other Public Sector Employers | 2014 | 1 | $125,000 |
| Invasive Species Centre (ISC) | Other Public Sector Employers | 2025 | 2 | $120,207 |
| Invest Ontario | Crown Agencies | 2025 | 36 | $154,204 |
| Invest Ottawa (2013) | Other Public Sector Employers | 2025 | 23 | $152,855 |
| Invest Ottawa / Investir Ottawa | Other Public Sector Employers | 2012 | 3 | $148,449 |
| IOOF Senior Citizen Homes Inc. | Other Public Sector Employers | 2005 | 2 | $118,855 |
| Ioof Seniors Homes Inc | Other Public Sector Employers | 2025 | 16 | $138,030 |
| Iron Workers Local 736 Training and Apprenticeship Centre | Other Public Sector Employers | 2025 | 3 | $150,707 |
| Ironworkers Local 765 Training Centre Fund | Other Public Sector Employers | 2025 | 3 | $162,423 |
| Ironworkers Local 786 Upgrading and Training Inc | Other Public Sector Employers | 2025 | 1 | $102,045 |
| Iroquois Falls Family Health Team | Other Public Sector Employers | 2023 | 1 | $122,168 |