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Mark Veneziano listen


Mark* gets straight to the point, with both his clients and the courts. He offers sharp insights to try to resolve disputes before they start, but his extensive trial experience means that he's a formidable foe in court. Mark specializes in commercial litigation, where he thinks§ outside the box to achieve results for his clients. He relies on his good judgment and experience to think big , but he also sees the big picture, offering pragmatic advice in a clear, accessible manner. It's why both clients and judges respect and trust him. .



Mark Veneziano

is a partner at Lenczner Slaght.

"Mark is very strategic, practical and technically sound. He is a true partner and understands his clients’ business." — Chambers Canada

Mark has a broad-based litigation practice, encompassing commercial litigation, professional liability, shareholder disputes, insurance coverage, securities, construction and real estate law. His clients range from corporations and physicians to stockbrokers and banks.

Mark provides his clients with practical advice aimed at efficiently resolving disputes. However, when the case demands, he is willing and prepared to go to trial. Mark is an experienced trial lawyer. He has conducted dozens of trials as lead counsel in commercial, securities and medical negligence matters. He regularly acts as lead counsel in commercial arbitrations. Mark has significant experience in the area of professional regulation, and appears frequently before the College of Physicians and Surgeons of Ontario and other administrative and regulatory tribunals.

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  • The Advocates' Society

  • Canadian Bar Association

  • Ontario Bar Association

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  • Benchmark Canada (2014-2024)

    Litigation Star – Commercial

  • Best Lawyers in Canada (2013-2024)

    Construction Law, Corporate & Commercial Litigation, Health Care Law, Insurance, Medical Negligence, Real Estate Law

  • Best Lawyers in Canada (2018)

    Toronto "Lawyer of the Year" in Health Care Law

  • Canadian Legal Lexpert® Directory (2012-2024)

    Litigation - Commercial Insurance, Litigation - Corporate Commercial, Medical Negligence, Professional Liability

  • Chambers Canada (2024)

    Healthcare: Contentious (Nationwide – Canada)

  • Lexpert Rising Stars (2009)

    Leading Lawyers Under 40

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

  • Lexpert Special Edition: Canada's Leading Infrastructure Lawyers (2020-2021)

  • Lexpert Special Edition: Canada's Leading Litigation Lawyers (2016-2018, 2020-2021, 2023)

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

    Corporate Commercial

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