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Colin Johnston listen


Colin* is a strategic thinker. That’s good for his clients, who he represents in litigation matters relating to public and administrative law, professional regulation, and health law. Colin appears in all levels of court in Ontario and before various administrative tribunals. Colin brings§ a diverse range of experience to his practice. Having served as a prosecutor at the College of Physicians and Surgeons of Ontario gives him an inside understanding of professional regulation. He previously practiced at another prominent Bay Street law firm, representing clients in commercial and regulatory cases. Colin regularly speaks at educational events on issues in healthcare law, trial advocacy, and professional regulation. His experience gives clients perspective on complex legal challenges. When professionals face multiple obstacles and significant stress, Colin helps his clients see past their immediate difficulties and brings a long-term view, working to develop a strategy to protect clients’ personal and professional interests. .


  • Practice Areas:
  • Bar Admissions:
    • Ontario (2003)
  • Education:
    • University College London (2016) LLM (Distinction)
    • Dalhousie University (2002) LLB
    • Dalhousie University (1999) MA (Philosophy)
    • Trent University (1997) BA (Philosophy) (Honours)


Colin Johnston

is counsel at Lenczner Slaght.

Colin's litigation practice focuses on healthcare litigation and administrative law. He has appeared as counsel before all levels of court in Ontario and in hearings before various administrative tribunals. Colin regularly represents professionals in civil and regulatory proceedings. He is a trusted advisor on issues in healthcare law, including privacy breaches, mental health law, hospital governance, medical malpractice, and professional regulation.

From 2009 to 2014, Colin was counsel to the College of Physicians and Surgeons of Ontario, where he appeared as lead counsel in numerous hearings before the College’s Discipline and Fitness to Practise Committees. He previously practiced litigation at a large national law firm in Toronto, representing clients in complex commercial and regulatory disputes.

  • Canadian Bar Association

  • Ontario Bar Association - Member-At-Large of the Health Law Executive

  • The Advocates' Society

  • Best Lawyers in Canada (2019-2022)

    Health Care Law, Medical Negligence

  • Canadian Legal Lexpert® Directory (2021)

    Medical Negligence, Professional Liability

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