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Katelyn Leonard listen


Katelyn* has a broad and strategic perspective that is informed by her diverse experience. She spent several years advising senior Ontario Public Service executives about how to achieve successful organizational and business transformation, primarily in the criminal justice sector. Having also practiced in several specialized areas of litigation, Katelyn has§ a keen ability to view problems from multiple angles and find creative solutions. Her commitment to excellence drives her to constantly push herself and others to maintain high standards , and she always acts with integrity. .



Katelyn Leonard (she/her)

is an associate at Lenczner Slaght.

Katelyn maintains a broad practice, with experience in complex commercial disputes, class actions, administrative proceedings, appeals, and competition, intellectual property, and securities litigation.

Prior to joining Lenczner Slaght, Katelyn practiced at a large national firm, where she represented clients in civil and regulatory proceedings. She specialized in competition law, foreign investment, and intellectual property litigation, while also maintaining a broad civil litigation practice. She also worked on Supreme Court of Canada appeals and an intervention in the areas of competition law and copyright.

Katelyn completed her law degree at Western University where she competed in the Philip C. Jessup International Law Moot Court Competition, worked as a research assistant in international criminal law, co-chaired the Western Law advocacy committee, and advised small businesses as a case manager with the Western Business Law Clinic. She also completed an internship with Global Affairs Canada, at Canada’s Permanent Mission to the United Nations in New York.

Prior to attending law school, Katelyn had a successful career with the Ontario Public Service, principally the Ministry of the Attorney General. She developed business and organizational strategies to ensure the success of large-scale and transformational change initiatives, primarily focused on improving the efficacy of the criminal justice system. Katelyn provided strategic advice, as well as research and drafting support, to the Bail Experts Table, an Attorney General-appointed group of experts tasked with developing recommendations to improve the functioning of bail courts across Ontario.

Katelyn participates in pro bono programs through Pro Bono Ontario. She sits on both the University of Toronto Woodsworth College Alumni Association board of directors and the Woodsworth College Council. Katelyn also mentors several law students and aspiring law students.

  • Dramel Limited v Multani

    Counsel to the successful mortgage lender in a motion to lift an interim stay of enforcement obtained by the borrowers. As well, in a series of court decisions confirming the validity of the mortgage agreements and the enforceability of a significant commercial mortgage subject to a forbearance agreement.

    Madison Robins, Katelyn Leonard & Mahgol Taghivand | November 1, 2022

  • Bilak et al v The Attorney General of Canada

    Application for Judicial Review challenging the decision of the Minister of Foreign Affairs of Canada to exempt turbines for the NordStream pipeline from Canada’s sanctions regime against Russia enacted following Russia’s invasion of Ukraine. The Minister’s exemption was cancelled following the commencement of the Judicial Review application.

    Monique Jilesen, Lidiya Yermakova, Katelyn Leonard & Solomiya Zakharchuk | July 1, 2022

  • American Bar Association

  • Canadian Bar Association

  • Ontario Bar Association

  • Arbor Award (2023)

    University of Toronto

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