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Top 100 public sector organisations in Ontario

Tamtam tracks 196 public sector organisations headquartered in Ontario. This list ranks the 100 largest by number of employees on LinkedIn, led by University of Toronto, Canada Post / Postes Canada and City of Toronto. Their median headcount is 4,369. Half of them were founded in 1967 or later. The most common headquarters are Toronto (26), Ottawa (25) and Hamilton (5).

🇨🇦 Ontario100 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
University of Torontodefygravitycampaign.utoronto.ca

Leading Canadian university focused on research, innovation, and global education to address pressing societal challenges and prepare students for success

Higher Education 🇨🇦 Toronto 28,832 n/a
2
Canada Post / Postes Canadacanadapost-postescanada.ca

Nationwide postal service with extensive retail network, delivering parcels and mail to over 17 million Canadian addresses.

Freight and Package Transportation 🇨🇦 Ottawa 23,941 n/a
3
City of Torontotoronto.ca

Provides diverse public services to residents, businesses, and visitors, encompassing technology, finance, culture, and innovation, employing a large workforce across numerous divisions.

Government Administration 🇨🇦 Toronto 23,495 n/a
4
Canadian Armed Forces | Forces armées canadiennesforces.ca

Offering over 100 trades, the organization provides world-class qualifications, competitive salaries, benefits, stability, and exciting opportunities for travel, adventure, and making a difference

Armed Forces 🇨🇦 Ottawa 20,412 n/a
5
CBC/Radio-Canadacbc.radio-canada.ca

Canadian public broadcaster promoting Canadian culture through diverse programming in multiple languages, supporting creative work and job opportunities in television production

Broadcast Media Production and Distribution 🇨🇦 Ottawa 14,336 n/a
6
McMaster Universitymcmaster.ca

Leading Canadian university known for innovation in education and research, serving 30,000 students and a global alumni network.

Higher Education 🇨🇦 Hamilton 13,160 1887
7
University Health Networkuhn.ca

Largest Canadian research hospital network specializing in patient care, medical research, education, and fundraising for advanced healthcare services.

Hospitals and Health Care 🇨🇦 Toronto 11,930 n/a
8
Toronto District School Boardtdsb.on.ca

Serving over 239,000 students and 100,000 adult learners across 582 schools, focusing on academic performance and community support.

Primary and Secondary Education 🇨🇦 Toronto 11,719 n/a
9
University of Waterloouwaterloo.ca

Leader in innovation driving economic and social prosperity through talent pipeline, groundbreaking research, entrepreneurial culture, and industry collaboration for student success

Higher Education 🇨🇦 Waterloo 11,390 n/a
10
York Universityyorku.ca

Educates students, fosters career advancement, and drives positive societal change through research and community engagement.

Higher Education 🇨🇦 Toronto 11,154 1959
11
Peel District School Boardpeelschools.org

A large organization in Peel serving over 156,000 students in K-12 with a focus on inspiring success, confidence, and hope through various programs and support services

Primary and Secondary Education 🇨🇦 Mississauga 10,571 n/a
12
Queen's Universityqueensu.ca

A prestigious university known for its research, innovation, and commitment to addressing global challenges through scholarship and international engagement

Higher Education 🇨🇦 Kingston 9,891 1841
13
Ontario Power Generationopg.com

Leading clean power generator advancing clean energy innovations, striving for a net-zero future with diverse electricity generation fleet in Ontario and the United States

Utilities 🇨🇦 Toronto 9,878 1999
14
City of Ottawa / Ville d’Ottawajobs-emplois.ottawa.ca

A diverse workforce providing essential programs and services for over one million residents in Ottawa, with a focus on customer service and community well-being

Government Administration 🇨🇦 Ottawa 9,194 1855
15
Toronto Transit Commission (TTC)ttc.ca

A leading transit system in Toronto, providing safe and reliable transportation to over 17 million customers daily through various modes

Urban Transit Services 🇨🇦 Toronto 8,829 1921
16
Health Canada | Santé Canadahealth.canada.ca

A Federal department in Canada focused on improving health for individuals through recruitment of professionals in various fields and student programs

Government Administration 🇨🇦 Ottawa 8,686 n/a
17
Toronto Metropolitan Universitytorontomu.ca

Innovative urban university in Toronto, focusing on creativity, entrepreneurship, inclusivity, and global community engagement to serve societal needs

Higher Education 🇨🇦 Toronto 8,478 n/a
18
University of Guelphuoguelph.ca

Dedicated to improving quality of life through innovative research and education in essential areas like water, food, health, and environment

Higher Education 🇨🇦 Guelph 7,725 1964
19
The Ottawa Hospitalottawahospital.on.ca

Innovative teaching and research hospital providing specialized care, developing new treatments, and improving patient care through community engagement and global impact

Hospitals and Health Care 🇨🇦 Ottawa 7,679 1998
20
Sunnybrooksunnybrook.ca

A leading teaching hospital affiliated with the University of Toronto, specializing in patient care, groundbreaking research, and inventing the future of healthcare

Hospitals and Health Care 🇨🇦 Toronto 7,599 1948
21
London Health Sciences Centre (LHSC)lhsc.on.ca

Acute care teaching hospital offering specialized clinical services, leading in discovery and innovation, providing exceptional patient care and training healthcare professionals

Hospitals and Health Care 🇨🇦 London 7,092 n/a
22
Carleton Universitycarleton.ca

University located near government and high tech companies, combining research and teaching to provide superior education and solve real problems.

Higher Education 🇨🇦 Ottawa 6,886 1942
23
Ottawa-Carleton District School Board (OCDSB)ocdsb.ca

A large school board in Eastern Ontario offering a wide range of programs to support students in academics, arts, athletics, and technology

Education Administration Programs 🇨🇦 Ottawa 6,863 n/a
24
CBCcbc.ca

Canada's national public broadcaster provides a wide range of radio, television, internet, and satellite services, offering diverse regional and cultural perspectives

Broadcast Media Production and Distribution 🇨🇦 Toronto 6,848 1932
25
Seneca Polytechnicsenecapolytechnic.ca

Innovative, daring organization encouraging advancement and leadership in polytechnic education

Higher Education 🇨🇦 Toronto 6,721 n/a
26
Hamilton Health Scienceshamiltonhealthsciences.ca

Healthcare organization delivering specialized cardiac, stroke, trauma, cancer, palliative, and pediatric care to southwestern Ontario and beyond.

Hospitals and Health Care 🇨🇦 Hamilton 6,690 n/a
27
Toronto Catholic District School Boardtcdsb.org

A leading Catholic school board in Toronto providing educational excellence rooted in Gospel values to over 84,000 students across 195 schools

Primary and Secondary Education 🇨🇦 Toronto 6,590 1841
28
Metrolinxmetrolinx.com

Provincial agency managing regional transportation through GO Transit, UP Express, and PRESTO while executing the largest transit infrastructure expansion in Ontario history.

Urban Transit Services 🇨🇦 Toronto 6,444 n/a
29
Agriculture and Agri-Food Canada/ Agriculture et Agroalimentaire Canadaagriculture.canada.ca

Agriculture and agri-food company supporting farmers and food producers in growth and development Terms of use: http://owly/gnCW50FjUsI / http://owly/XHSU50FjUvL

Government Administration 🇨🇦 Ottawa 6,405 n/a
30
Trillium Health Partnersthp.ca

Leading hospital providing full range of acute care services, specialized programs, and community-based care Committed to delivering high-quality, accessible patient care

Hospitals and Health Care 🇨🇦 Mississauga 6,009 2011
31
Statistics Canada | Statistique Canadastatcan.gc.ca

A leading statistical agency providing relevant, accurate, and timely data to help Canadians better understand their country through an app and podcast series

Government Administration 🇨🇦 Ottawa 5,917 1918
32
LCBOlcbo.com

Aiming to deliver exceptional experiences, this retailer and wholesaler is a trusted destination for wines, beers, and spirits in Ontario They prioritize customer satisfaction and community support

Retail 🇨🇦 Toronto 5,666 1927
33
Fisheries and Oceans Canada / Pêches et Océans Canadadfo-mpo.gc.ca

Manage fisheries and aquaculture sustainably, protect aquatic ecosystems, maintain navigable waterways, and respond to maritime emergencies with Indigenous collaboration.

Government Administration 🇨🇦 Ottawa 5,665 n/a
34
Correctional Service Canada │ Service correctionnel Canadacsc-scc.gc.ca

Administer federal prison sentences, manage institutions with various security levels, and supervise offenders under conditional release in communities.

Public Safety 🇨🇦 Ottawa 5,587 1979
35
Transport Canada - Transports Canadatc.canada.ca

A department with 5000 employees nationwide seeks individuals to contribute to meaningful work, growth opportunities, attractive benefits, and inclusive work environment

Government Administration 🇨🇦 Ottawa 5,540 1936
36
George Brown Polytechnicgeorgebrown.ca

Leading college in Toronto with industry connections, offering real-world experience through diverse programs for full and part-time students Visit website for details

Higher Education 🇨🇦 Toronto 5,381 1967
37
Humber Collegehumber.ca

Provides diverse full-time, part-time, and online programs focused on career readiness, serving thousands of students with quality teaching.

Higher Education 🇨🇦 Toronto 5,249 1967
38
Conestoga Collegeconestogac.on.ca

career-focused education, training, applied research, technology-enhanced learning, co-op opportunities, and comprehensive student support for diverse learners.

Higher Education 🇨🇦 Kitchener 5,198 1967
39
Shared Services Canada | Services partagés Canadacanada.ca

Modernizing Government of Canada's IT infrastructure by delivering email, data centre, telecommunication, videoconferencing, and Wi-Fi services to customers

Government Administration 🇨🇦 Ottawa 5,161 2011
40
Sheridan Collegesheridancollege.ca

Established in 1967, this institution has grown to become a leading Ontario postsecondary institution with four campuses and a diverse range of programs

Higher Education 🇨🇦 Oakville 5,079 1967
41
Centennial Collegecentennialcollege.ca

Leading Ontario community college with diverse campus locations, offering innovative programs, exemplary teaching, and extensive partnership building since 1966

Higher Education 🇨🇦 Toronto 5,076 1966
42
Algonquin College of Applied Arts and Technologyalgonquincollege.com

Leading college in eastern Ontario offering diverse hands-on learning programs, including degrees, diplomas, and certificates, with a strong focus on student success and innovation

Higher Education 🇨🇦 Ottawa 4,972 n/a
43
St. Michael's Hospitalunityhealth.to

A leading hospital providing compassionate care, medical education in 27 disciplines, and research through the Keenan Research Centre for global impact

Hospitals and Health Care 🇨🇦 Toronto 4,868 1892
44
Durham District School Boardddsb.ca

A public education board in rural and urban communities, providing educational services to over 79,000 regular day students in 135 schools

Education Administration Programs 🇨🇦 Whitby 4,721 n/a
45
Waterloo Region District School Boardwrdsb.ca

A large school board in Ontario providing education for approximately 62,000 students from kindergarten to grade 12, with a focus on student success and community involvement

Primary and Secondary Education 🇨🇦 Kitchener 4,717 n/a
46
City Of Hamiltonhamilton.ca

The organization aims to provide high-quality public services for a healthy, safe, and prosperous community while fostering collective ownership and diversity

Government Administration 🇨🇦 Hamilton 4,633 n/a
47
Ottawa Catholic School Boardocsb.ca

Providing faith-based, inclusive education with English and French programs, fostering critical thinking, creativity, well-being, and community connections.

Education Administration Programs 🇨🇦 Ottawa 4,559 1856
48
CAMHcamh.ca

A leading teaching hospital in Canada focused on transforming lives through clinical care, research, education, and advocacy for mental health and addiction issues

Hospitals and Health Care 🇨🇦 Toronto 4,477 1998
49
Fanshawe Collegefanshawec.ca

A large college in Ontario offering diploma, degree, certificate, and apprenticeship programs to over 43,000 students annually from 50 countries

Higher Education 🇨🇦 London 4,454 1967
50
Canada Border Services Agency | Agence des services frontaliers du Canadacbsa-asfc.gc.ca

Ensures national security and economic prosperity by managing and monitoring international travel and trade at Canada's borders.

Government Administration 🇨🇦 Ottawa 4,369 2003
51
William Osler Health Systemwilliamoslerhs.ca

Health system with three hospitals serving 13 million residents, providing a wide range of services including inpatient, outpatient, urgent care, and specialty clinics

Hospitals and Health Care 🇨🇦 Brampton 4,350 n/a
52
Halton District School Boardhdsb.ca

Educates 67,000+ students across Southern Ontario, focusing on innovation, collaboration, and staff development in various cities like Burlington and Milton.

Primary and Secondary Education 🇨🇦 Burlington 4,292 n/a
53
University of Windsoruwindsor.ca

A student-focused university offering undergraduate and graduate programs, professional schools, and innovative research facilities, promoting diversity and excellence in education

Higher Education 🇨🇦 Windsor 4,284 n/a
54
City of Bramptonbrampton.ca

City with diverse cultures and innovative spirit focusing on technology, environmental innovation, and community-driven progress for residents and businesses.

Government Administration 🇨🇦 Brampton 4,240 n/a
55
Workplace Safety and Insurance Board (WSIB)wsib.ca

A provider of insurance, benefits, and support to individuals who suffer work-related injuries or illnesses, helping them return to work

Insurance 🇨🇦 Toronto 4,179 n/a
56
Dufferin-Peel Catholic District School Boarddpcdsb.org

A large school board in Ontario with over 80,000 students in 151 schools, providing Catholic education and adult learning programs

Education Administration Programs 🇨🇦 Mississauga 4,108 n/a
57
Brock Universitybeacons.ai

A top Canadian post-secondary institution offering diverse programs, research opportunities, and experiential learning to students alongside a supportive employment environment

Higher Education 🇨🇦 St. Catharines 4,079 1962
58
Wilfrid Laurier Universitywlu.ca

Canadian university focusing on teaching, research, and student satisfaction with programs in arts, business, science, social work, and education.

Higher Education 🇨🇦 Waterloo 4,060 n/a
59
Canadian Food Inspection Agencyinspection.canada.ca

A federal regulator in Canada focused on enhancing food safety, animal health, and protecting plant resources with a commitment to employee growth and impact

Government Administration 🇨🇦 Ottawa 4,024 1997
60
Lakeridge Healthlakeridgehealth.on.ca

A comprehensive healthcare provider with multiple hospitals, specialty centers, and community services, committed to delivering high-quality care to the region

Hospitals and Health Care 🇨🇦 Ajax 3,760 1998
61
Canadian Blood Servicesblood.ca

Canada's national organization responsible for ensuring a secure and sustainable supply of blood and organs for transfusion and transplantation

Non-profit Organizations 🇨🇦 Ottawa 3,745 1998
62
OLGolg.ca

A company in the gaming industry in Ontario, focused on maximizing economic benefits through socially responsible gaming entertainment, led by their dedicated employees

Entertainment Providers 🇨🇦 Toronto / Sault Ste. Marie 3,487 1975
63
Hamilton-Wentworth District School Board (HWDSB)hwdsb.on.ca

Empowering students to learn and grow to their full potential in a diverse world through fostering curiosity, creativity, and possibility

Primary and Secondary Education 🇨🇦 Hamilton 3,452 n/a
64
Mohawk Collegemohawkcollege.ca

A leading educational institution in Ontario, offering a wide range of programs to 30,000 students, with a focus on student and graduate satisfaction

Higher Education 🇨🇦 Hamilton 3,267 1967
65
Niagara Healthniagarahealth.on.ca

Regional hospital system providing acute care services, research, and innovation to improve healthcare for residents in the Niagara region

Hospitals and Health Care 🇨🇦 St. Catharines 3,213 n/a
66
Durham Collegedurhamcollege.ca

Durham College offers full-time and part-time programs in various disciplines to over 12,000 students, including a new health care technology management degree program

Higher Education 🇨🇦 Oshawa 3,210 1967
67
Mackenzie Healthmackenziehealth.ca

Regional healthcare provider in Southwest York Region with two hospitals and community-based services, offering a wide range of healthcare programs and services to the community

Hospitals and Health Care 🇨🇦 Richmond Hill 3,197 1963
68
Ryerson Universitytorontomu.ca

Innovative urban university in downtown Toronto focusing on entrepreneurship, offering over 100 programs to 45,300 students with a commitment to community engagement

Higher Education 🇨🇦 Toronto 3,137 n/a
69
Ontario Health | Santé Ontarioontariohealth.ca

Government agency ensuring high-quality, patient-centred healthcare services across Ontario, promoting health equity and supporting healthcare professionals.

Hospitals and Health Care 🇨🇦 Toronto 3,020 2019
70
Conestoga Collegeon.ca

A leader in polytechnic education offering career-focused programs, engineering degrees, and support services while promoting economic prosperity and student success

Higher Education 🇨🇦 Kitchener 2,968 n/a
71
Georgian Collegegeorgiancollege.ca

Provider of over 130 market-driven programs including degrees, diplomas, certificates, and apprenticeships, with a focus on co-operative education and graduate employment success

Higher Education 🇨🇦 Barrie 2,963 1967
72
North York General Hospitalnygh.on.ca

A leading community academic hospital in Canada offering a wide range of acute, ambulatory, and long-term care services with a focus on patient- and family-centered care

Hospitals and Health Care 🇨🇦 North York 2,917 1968
73
Canadian Coast Guard/Garde côtière canadiennecanada.ca

A federal agency that operates a civilian fleet and provides maritime services to Canadians, ensuring safe waters, environmental protection, and economic growth

Government Administration 🇨🇦 Ottawa 2,892 1962
74
Canada Mortgage and Housing Corporation (CMHC) Société canadienne d'hypothèques et de logement(SCHL)cmhc-schl.gc.ca

Provide housing financing solutions, implement government housing programs, and share research and data to support the housing sector.

Government Administration 🇨🇦 Ottawa 2,887 1946
75
Toronto Police Servicetps.ca

Providing comprehensive police services with a focus on community partnership, innovation, training, and diverse career opportunities for members.

Law Enforcement 🇨🇦 Toronto 2,815 1834
76
Kingston Health Sciences Centrekingstonhsc.ca

Top Canadian hospital, advancing health care through patient care, medical research, and training future healthcare professionals for Southeastern Ontario.

Hospitals and Health Care 🇨🇦 Kingston 2,793 1849
77
CHEOcheo.on.ca

A global leader in pediatric health care and research, providing excellence in complex care, education, and community partnership for children and youth

Hospitals and Health Care 🇨🇦 Ottawa 2,784 1974
78
Export Development Canada | Exportation et développement Canadalinktr.ee

Provide financial products, trade knowledge, and support to Canadian businesses for global growth, risk management, and sustainable inclusive trade.

Financial Services 🇨🇦 Ottawa 2,752 1944
79
Niagara Collegeniagaracollege.ca

Leader in applied education and training, established in 1967 in Welland and now expanding across the Niagara region for top student satisfaction

Higher Education 🇨🇦 Welland 2,686 1967
80
Simcoe County District School Boardscdsb.on.ca

A large education system in Ontario providing public education to over 50,000 students from Kindergarten to Grade 12, along with adult education services

Primary and Secondary Education 🇨🇦 Midhurst 2,609 n/a
81
Scarborough Health Networkshn.ca

A leading healthcare organization in Scarborough, offering diverse programs and services, including nephrology, cardiac care, spine center, and medical training partnerships with universities

Hospitals and Health Care 🇨🇦 Scarborough 2,536 2018
82
Bank of Canadabankofcanada.ca

Central bank focused on maintaining low, stable inflation and promoting economic and financial welfare for Canada's overall economic health.

Banking 🇨🇦 Ottawa 2,496 1935
83
Ontario Tech Universityontariotechu.ca

Innovative university focusing on advancing knowledge, integrating social and ethical implications of technology, and collaborating on solutions with partners

Higher Education 🇨🇦 Oshawa 2,479 2003
84
Canadian Nuclear Laboratoriescnl.ca

A leading organization in nuclear science and technology, specializing in research, development, engineering, waste management, and decommissioning services for various applications

Research Services 🇨🇦 Chalk River 2,340 2014
85
Michael Garron Hospitaltehn.ca

A vibrant community hospital in East Toronto providing high-quality, patient-centred healthcare services along the continuum of care with strong partnerships

Hospitals and Health Care 🇨🇦 Toronto 2,219 1929
86
Royal Victoria Regional Health Centrervh.on.ca

Healthcare institution in Barrie, Ontario serving over 450,000 residents with specialized services like interventional radiology, stroke care, trauma, cancer, heart, child, and youth programs

Hospitals and Health Care 🇨🇦 Barrie 2,191 1897
87
Collège La Citécollegelacite.ca

Discover life in the largest French-speaking college in Ontario Stay informed about job opportunities Dynamic, inclusive environment with top employer rankings Follow on social media for more

Higher Education 🇨🇦 Ottawa 2,069 1990
88
Grand River Hospitalwrhn.ca

Ontario's large community hospital in Kitchener - Waterloo, offering a wide range of medical programs and services with over 6000 team members

Hospitals and Health Care 🇨🇦 Kitchener 2,058 n/a
89
Upper Grand District School Boardugdsb.ca

The organization provides education to over 35,000 students in Guelph, Wellington, and Dufferin, focusing on student success and promoting diversity, equity, and inclusion

Education Administration Programs 🇨🇦 Guelph 2,050 1998
90
Kawartha Pine Ridge District School Boardkprschools.ca

The company is a school board that values staff, offers leadership opportunities, and serves urban and rural communities with 88 schools

Education 🇨🇦 Peterborough 1,989 n/a
91
Oak Valley Healthoakvalleyhealth.ca

A leading Ontario community health care organization with two hospitals and a Reactivation Care Centre, providing high-quality, patient-centered care Funded by community donations

Hospitals and Health Care 🇨🇦 Markham 1,969 1990
92
St. Lawrence Collegestlawrencecollege.ca

A leading community college in Eastern Ontario offering over 100 programs, preparing students for the global economy with practical learning opportunities

Higher Education 🇨🇦 Kingston 1,921 1967
93
District School Board of Niagaradsbn.org

A network of schools in the Niagara Region providing quality public education to over 39,000 students with a focus on student learning and empowerment

Education Administration Programs 🇨🇦 St Catharines 1,902 n/a
94
Toronto Hydrotorontohydro.com

Operate and maintain electricity distribution system serving nearly 793,000 customers, ensuring safe, reliable power supply in Toronto.

Utilities 🇨🇦 Toronto 1,861 1911
95
Halton Catholic District School Boardhcdsb.org

A publicly-funded Catholic education system serving over 37,000 students in the Halton Region with a focus on achievement and community

Primary and Secondary Education 🇨🇦 Burlington 1,852 1969
96
St. Clair Collegestclaircollege.ca

Post-secondary education institution offering 120+ programs in Health Sciences, Business, Engineering, Media & Arts, with residences for students in Windsor and Chatham

Higher Education 🇨🇦 Windsor 1,807 1967
97
Toronto Public Librarytpl.ca

A busy urban public library system in Toronto providing access to technology, lifelong learning, diverse cultural experiences, and leisure activities

Libraries 🇨🇦 Toronto 1,758 n/a
98
Health Sciences North/Horizon Santé-Nordhsnsudbury.ca

An integrated network providing high-quality patient care, research, teaching, and services in various medical specialties to communities in Northern Ontario

Hospitals and Health Care 🇨🇦 Sudbury 1,755 n/a
99
Fleming Collegeflemingcollege.ca

Fleming College offers personalized learning and support in various fields, fostering innovation and sustainability for students, communities, and the environment

Education Administration Programs 🇨🇦 Peterborough 1,746 1967
100
University of Toronto Mississaugautm.utoronto.ca

A well-established academic institution with a diverse range of programs and institutes, serving thousands of students and employing a large staff

Higher Education 🇨🇦 Mississauga 1,732 1967

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.

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