Major employers in Oshawa

19 employers, 7 of them head offices: 2 worldwide, 1 national and 4 regional. Headcounts are for the site here, with the page that publishes them.

Oshawa — the /local page · Who represents Oshawa · Companies

Employers19
Worldwide HQ2
National HQ1
Regional HQ4
1

Employers, largest first

People employed at the site in this city where a source publishes it; head offices without a published count follow.

CompanyHereEmployees hereWorldwide HQJobs
Lakeridge HealthHealth care — hospital systemMajor site9,0002025Oshawa, OntarioCareers →
General Motors of CanadaManufacturing — motor vehicle assembly (Oshawa Assembly) and Canadian head officepart of General Motors CompanyNational HQCanada3,5002025Detroit, Michigan—
Durham Catholic District School BoardEducation — K-12 school boardRegional HQCatholic school board, Durham Region (board office in Oshawa)3,5002025Oshawa, OntarioCareers →
Durham CollegeEducation — collegeMajor site2,7502025Oshawa, OntarioCareers →
Ontario Power Generation (OPG)Utilities — electricity generation (nuclear, hydro)part of Province of Ontario (Crown corporation)Worldwide HQglobal (Ontario Crown corporation; corporate headquarters)2,0002023Oshawa, OntarioCareers →
Cleeve Technology InternationalManufacturing — electrical interconnect / wire harness and cable assemblies (aerospace, defence)Worldwide HQglobal—Oshawa, OntarioCareers →
Community Living Oshawa/ClaringtonSocial assistance — developmental servicesRegional HQdevelopmental-services agency (Oshawa and Clarington)—Oshawa, OntarioCareers →
Durham Children's Aid SocietySocial assistance — child welfareRegional HQchild-welfare agency, Durham Region—Oshawa, OntarioCareers →
Durham Community Health CentreHealth care — community health centreRegional HQcommunity health centre (two Oshawa sites and Pickering)—Oshawa, OntarioCareers →
Canada Revenue Agency — OshawaPublic administration — federalpart of Government of CanadaMajor site—Ottawa, OntarioCareers →
City of OshawaPublic administration — municipalMajor site—Oshawa, OntarioCareers →
GEODIS — OshawaTransportation & warehousing — contract logisticspart of GEODIS (SNCF Group)Major site—Levallois-Perret, FranceCareers →
HOPA Ports — Port of OshawaTransportation — port authoritypart of Hamilton-Oshawa Port AuthorityMajor site—Hamilton, OntarioCareers →
Lactalis Canada — OshawaManufacturing — dairy productspart of Groupe LactalisMajor site—Laval, FranceCareers →
Martin Brower Canada — Oshawa DCWholesale / logistics — foodservice distributionpart of Martin BrowerMajor site—Chicago area, IllinoisCareers →
Ontario Ministry of Finance — Oshawa officePublic administration — provincialpart of Government of OntarioMajor site—Toronto, OntarioCareers →
Ontario Tech UniversityEducation — universityMajor site—Oshawa, OntarioCareers →
Oshawa Public LibrariesPublic libraryMajor site—Oshawa, OntarioCareers →
Trent University Durham GTAEducation — university campuspart of Trent UniversityMajor site—Peterborough, OntarioCareers →
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Notes on this record

  • Durham 2025 Business Count Highlights: Oshawa had 61,781 jobs in 2025 (60,304 in 2024), the most of any Durham municipality. Its 'Top 10 Employers in Durham' headcounts are Region-wide bands, so for system-wide employers (Lakeridge Health, OPG, school boards) they are not Oshawa-only counts; each row says which.
  • Durham top-10 also lists Tim Hortons (2,000–2,249), Walmart (2,000–2,249) and Amazon (2,000–2,249) Region-wide; no Oshawa-specific site source was opened for them, so they are not rows here (Amazon is listed under Whitby).
  • Blocked / left out: gm.ca and other GM hosts (Akamai/Cloudflare 403 — GM row kept from news and Region sources, no careers link); opg.com (Cloudflare 403; OPG row kept, careers board jobs.opg.com opened); concentrix.com (robots.txt Disallow: / for us); Aosom Canada (aosom.ca 403), Draka EHC / EHC Global (ehc-global.com → drakaehc.com 403), Oshawa Clinic Group (403), Oshawa Power / Oshawa PUC (opuc.on.ca 403), Spark Centre (403), CMHA Durham (403); Dynet (IT services, dynet.ca returned a challenge page); Durham Region Transit's head office location was not confirmed, so DRT is not a row (careers via the Region's board); Mackie Moving Systems (mackiemoving.com is a parked lander page, no company site found) — all named as Oshawa major employers by Invest Durham or local sources but not added because their own sites could not be opened.
  • No venture-funded software or tech company with its head office in Oshawa was verified in this pass.
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Sources

Prepared 2026-10-30. Each headcount links to the page it is read from; each company to its own site or its /company page.