| L'Arche Hamilton | Other Public Sector Employers | 2025 | 1 | $100,806 |
| L'Association franco-ontarienne des conseils scolaire catholiques | Other Public Sector Employers | 2015 | 1 | $125,034 |
| La Cité Collegiale | Colleges | 2025 | 218 | $131,012 |
| La Corporation du Conseil des Ministres de l'Education Canada (CMEC) | Other Public Sector Employers | 2025 | 25 | $128,100 |
| Labdara Lithuanian Nursing Home | Other Public Sector Employers | 2025 | 9 | $113,161 |
| Labour | Government of Ontario – Ministries | 2019 | 274 | $121,343 |
| Labour, Immigration, Training and Skills Development | Government of Ontario – Ministries | 2025 | 1,272 | $129,406 |
| Labourers International Union of North America Local 1059 Training Fund Management Inc (Liuna) | Other Public Sector Employers | 2018 | 1 | $135,000 |
| Labourers Local 493 Training Trust Fund | Other Public Sector Employers | 2023 | 1 | $101,384 |
| Labourers Local 625 Training Trust | Other Public Sector Employers | 2018 | 2 | $167,076 |
| Labourers' International Union of North America Local 1059 GE | Other Public Sector Employers | 2025 | 8 | $136,357 |
| Labourers' International Union of North America Local 506 | Other Public Sector Employers | 2025 | 10 | $133,097 |
| Labourers' Local 183 Members Training and Rehabilitation Fund | Other Public Sector Employers | 2016 | 4 | $143,897 |
| Labours Local 1089 (Sarnia) Training & Rehab Trust Fund | Other Public Sector Employers | 2022 | 2 | $148,935 |
| Lac des Mille Lacs First Nation | Other Public Sector Employers | 2015 | 1 | $104,573 |
| Lac des Milles Lacs First Nation | Other Public Sector Employers | 2017 | 1 | $105,000 |
| Lac Seul First Nation | Other Public Sector Employers | 2025 | 9 | $116,580 |
| Lac Seul Police Service | Other Public Sector Employers | 2016 | 1 | $100,203 |
| Lac Seul Police Services Board Corp. | Other Public Sector Employers | 2025 | 5 | $138,893 |
| Lady Dunn Health Centre | Hospitals & Boards of Public Health | 2025 | 23 | $124,344 |
| Laidlaw Foundation | Other Public Sector Employers | 2018 | 1 | $165,358 |
| Lake of the Woods | Hospitals & Boards of Public Health | 2002 | 4 | $156,121 |
| Lake of the Woods Child Development Centre | Other Public Sector Employers | 2010 | 1 | $101,691 |
| Lake of the Woods Child Development Ctr | Other Public Sector Employers | 2004 | 1 | $109,079 |
| Lake of the Woods District Hospital | Hospitals & Boards of Public Health | 2025 | 130 | $124,361 |
| Lake Ridge Community Support Services | Other Public Sector Employers | 2016 | 1 | $131,912 |
| Lake Ridge Community Support Srvc | Other Public Sector Employers | 2025 | 2 | $139,539 |
| Lake Simcoe Conservation Authority | Other Public Sector Employers | 2008 | 4 | $114,572 |
| Lake Simcoe Region Conservation Auth. | Other Public Sector Employers | 2005 | 1 | $115,007 |
| Lake Simcoe Region Conservation Authority | Other Public Sector Employers | 2025 | 35 | $131,502 |
| Lake Woods District Hospital | Hospitals & Boards of Public Health | 2003 | 4 | $191,564 |
| Lakehead District Roman Catholic Separate School Board | School Boards | 1996 | 1 | $102,969 |
| Lakehead District School Board | School Boards | 2025 | 502 | $122,372 |
| Lakehead Nurse Practitioner Led Clinic | Other Public Sector Employers | 2023 | 7 | $124,241 |
| Lakehead Region Conservation Authority | Other Public Sector Employers | 2025 | 1 | $142,984 |
| Lakehead Regional Family Ctr. | Other Public Sector Employers | 1997 | 1 | $118,317 |
| Lakehead Regional Family Services | Other Public Sector Employers | 1996 | 1 | $118,774 |
| Lakehead University | Universities | 2025 | 421 | $154,039 |
| Lakeland Long Term Care | Other Public Sector Employers | 2014 | 3 | $102,566 |
| Lakeland Long Term Care Services Corporation | Other Public Sector Employers | 2025 | 8 | $115,965 |
| Lakeland Long-Term Care Services | Other Public Sector Employers | 2010 | 1 | $105,000 |
| Lakelands Family Health Team | Other Public Sector Employers | 2023 | 5 | $126,183 |
| Lakeridge Health | Hospitals & Boards of Public Health | 2025 | 1,721 | $123,879 |
| Lakeshore Area Multi-Service Project | Other Public Sector Employers | 2005 | 3 | $118,530 |
| Lakeshore Area Multi-Service Project (LAMP) | Other Public Sector Employers | 1997 | 2 | $123,119 |
| Lakeshore Area Multi-Service Project (LOMP) | Other Public Sector Employers | 1996 | 2 | $122,747 |
| Lakeshore Area Multi-services Project Inc (LAMP) | Other Public Sector Employers | 2025 | 20 | $193,617 |
| Lakeshore Area MultiService Proj. | Other Public Sector Employers | 1999 | 2 | $114,063 |
| Lakeshore Area Multiservice Project CHC | Other Public Sector Employers | 2007 | 3 | $134,081 |
| Lakeshore Community Nurse Practitioner-Led Clinic | Other Public Sector Employers | 2023 | 1 | $123,831 |
| Lakeview Family Health Team | Other Public Sector Employers | 2023 | 1 | $108,169 |
| Lambton Area Water Supply System | Municipalities & Services | 2009 | 1 | $109,860 |
| Lambton College of Applied Arts and Technology | Colleges | 2025 | 155 | $134,369 |
| Lambton County | Hospitals & Boards of Public Health | 1999 | 3 | $122,910 |
| Lambton County BE | School Boards | 1997 | 1 | $103,352 |
| Lambton County Board of Education | School Boards | 1996 | 1 | $118,204 |
| Lambton County Developmental Service | Other Public Sector Employers | 2012 | 1 | $107,420 |
| Lambton County Developmental Services | Other Public Sector Employers | 2025 | 4 | $112,508 |
| Lambton County Library | Other Public Sector Employers | 2002 | 1 | $113,964 |
| Lambton County RCSSB | School Boards | 1997 | 1 | $106,950 |
| Lambton Elderly Outreach Inc | Other Public Sector Employers | 2019 | 1 | $111,993 |
| Lambton Health Unit | Other Public Sector Employers | 1997 | 1 | $124,063 |
| Lambton Kent District School Board | School Boards | 2025 | 1,174 | $121,343 |
| LAMP CHC | Other Public Sector Employers | 2004 | 2 | $123,547 |
| LAMP Community Health Care Centre | Other Public Sector Employers | 2011 | 5 | $207,779 |
| LAMP Community Health Centre | Other Public Sector Employers | 2013 | 8 | $181,509 |
| Lampton Community Health Centre | Other Public Sector Employers | 2006 | 3 | $147,815 |
| Lanark County Board of Education | School Boards | 1996 | 1 | $121,649 |
| Lanark County Housing Corporation | Other Public Sector Employers | 2017 | 1 | $123,003 |
| Lanark County Interval House | Other Public Sector Employers | 2025 | 1 | $112,424 |
| Lanark Leeds and Grenville Addictions and Mental Health | Other Public Sector Employers | 2025 | 7 | $130,764 |
| Lanark, Leeds & Grenville County R.C.S.S. Board | School Boards | 1996 | 1 | $112,387 |
| Lanark, Leeds & Grenville County R.C.S.S.B | School Boards | 1997 | 1 | $126,089 |
| Land O'Lakes Community Services | Other Public Sector Employers | 2025 | 2 | $121,205 |
| Landlord and Tenant Board | Crown Agencies | 2023 | 50 | $121,392 |
| Landlord and Tenant Board, Social Benefits Tribunal | Crown Agencies | 2016 | 1 | $126,499 |
| Langs Farm CHC | Other Public Sector Employers | 1999 | 2 | $114,958 |
| Langs Farm Village Assoc. | Other Public Sector Employers | 2001 | 1 | $142,701 |
| Langs Farm Village Association | Other Public Sector Employers | 2025 | 24 | $159,997 |
| Lansdowne Children's Centre | Other Public Sector Employers | 2025 | 9 | $110,502 |
| LAT/CRAT | Crown Agencies | 2000 | 1 | $104,689 |
| Laubach Literacy Ontario | Other Public Sector Employers | 2025 | 1 | $122,297 |
| Launch Lab | Other Public Sector Employers | 2016 | 1 | $167,475 |
| Launch Lab (Eastern Ontario) Inc. | Other Public Sector Employers | 2018 | 1 | $173,002 |
| Laurencrest Youth Services Inc | Other Public Sector Employers | 2025 | 1 | $116,984 |
| Laurentian Hospital | Hospitals & Boards of Public Health | 1996 | 1 | $108,813 |
| Laurentian University of Sudbury | Universities | 2025 | 312 | $147,476 |
| Laurentis Energy Partners | Ontario Power Generation | 2025 | 113 | $158,418 |
| Law Enforcement Complaints Agency | Crown Agencies | 2025 | 27 | $154,077 |
| Lawrence Heights CHC | Other Public Sector Employers | 2002 | 2 | $113,184 |
| Lawrence Heights CHS | Other Public Sector Employers | 2004 | 3 | $114,092 |
| Lawrence Heights Comm. Hlth Cent. | Other Public Sector Employers | 1998 | 1 | $117,766 |
| Lawrence Heights Comm. Hlth Ctr. | Other Public Sector Employers | 1999 | 1 | $123,119 |
| Lawrence Heights Community Health Centre | Other Public Sector Employers | 2007 | 5 | $114,922 |
| Lawrence Hgts. Comm. Health Ctr. | Other Public Sector Employers | 1997 | 1 | $122,980 |
| Le Cap : Centre d'appui et de prévention | Other Public Sector Employers | 2025 | 9 | $117,323 |
| Le Centre Moi J’apprends Inc | Other Public Sector Employers | 2021 | 1 | $106,761 |
| Le Collge des Grands Lacs | Colleges | 1996 | 1 | $110,758 |
| Le Francais Pour l’Avenir/French for the Future | Other Public Sector Employers | 2024 | 1 | $117,199 |
| Le Regroupement des Gens d’Affaires de la Capitale Nationale Inc | Other Public Sector Employers | 2021 | 1 | $100,000 |