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Matthew Sammon listen


Matt* is recognized as a leading trial lawyer, with experience across many sectors and businesses of varying sizes, including commercial litigation, complex medical malpractice litigation and employment law. A tenacious advocate and formidable cross-examiner, Matt does§ anything to secure a positive outcome for his clients. While Matt assists beyond the courtroom, offering employment advice to clients in a number of industries, and as a presenter at continuing legal education programs, his passion for intensive advocacy means he is usually found conducting trials , regulatory hearings, and arbitral proceedings. And he does them well, achieving results for clients in the toughest cases. .



Matthew Sammon

is a partner at Lenczner Slaght.

"Matt Sammon is a warrior of a litigator. He is fearless and takes on strong cases." — Chambers Canada

Recognized as a leading and formidable trial counsel, Matthew has extensive litigation experience across a broad range of areas, including complex corporate and commercial litigation, professional liability and medical malpractice, and employment cases.

After 20 years of practice at Lenczner Slaght, Matthew is now one of the most experienced civil trial lawyers of his generation, having conducted trials, applications, and arbitrations in myriad areas, including infrastructure and construction, complex commercial proceedings, insurance, medical litigation, professional liability, and employment disputes.  

Matthew's experience as lead counsel for constructors in complex infrastructure and construction disputes in Ontario and other jurisdictions has earned him recognition as one of Canada's leading infrastructure lawyers.

His roster of clients has included large and mid-sized corporations across a wide range of sectors, including construction, financial services, insurance, banking, telecommunications, retail, health care, manufacturing, hospitality, and oil and gas. He also acts regularly for executives and other individuals in civil and regulatory disputes.

Matthew also has deep experience in professional regulation and medical malpractice litigation, appearing regularly as lead counsel in complex medical litigation and regulatory proceedings.

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  • Canadian Bar Association

  • Ontario Bar Association

  • The Advocates' Society

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  • Benchmark Canada (2015-2024)

    Litigation Star – Commercial, Professional Liability

  • Benchmark Canada (2019)

    Labour Employment Attorney of the Year

  • Best Lawyers in Canada (2014-2024)

    Corporate & Commercial Litigation, Health Care Law, Labour & Employment Law, Medical Negligence

  • Best Lawyers in Canada (2022)

    Toronto "Lawyer of the Year" in Medical Negligence

  • Canadian Legal Lexpert® Directory (2013-2024)

    Litigation - Corporate Commercial, Medical Negligence, Professional Liability, Litigation - Defamation & Media (2021), Employment Law (Employer) (2021)

  • Chambers Canada (2020-2024)

    Construction; Employment & Labour: Non-Unionised Employees; Healthcare: Contentious (Nationwide – Canada)

  • Lexpert Guide to the Leading US/Canada Cross-border Litigation Lawyers in Canada (2014-2017)

    Corporate Commercial Litigation, Litigation Lawyer to Watch (2014)

  • Lexpert Rising Stars (2013)

    Leading Lawyers Under 40

  • Lexpert Special Edition: Canada's Leading Health Sciences Lawyers (2021)

  • Lexpert Special Edition: Canada's Leading Infrastructure Lawyers (2020-2024)

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