David Williams

David helps clients secure practical results at every stage of a dispute. In each case he identifies his client’s objectives; develops creative strategies; and implements those strategies with rigor and resolve.

David works on consequential and complex class actions; commercial disputes; and disputes with governmental bodies. He applies his expertise in persuasive writing and navigating court procedures to a range of legal areas including securities, shareholder rights, contracts, taxation, competition, crown liability, land use, expropriation, and judicial review of government decisions. He has argued before the Ontario Superior Court of Justice and spoken at an administrative law conference, a topic he writes on frequently.

Before joining Osler, David clerked for one of Canada’s most influential appellate judges where he learned much about advocacy and the workings of Courts. David started getting practical experience early in his career by representing Pro Bono clients while in law school. A former Varsity Rugby player, David uses the same values of competition, collegiality, and teamwork to advance his clients’ interests.

Latest Insights

  • Osler Update Sep 29, 2023

    Proposal to change development charge exemptions for affordable housing

    Bill 124 provides a proposed definition which focusses on the ability of households to pay, as opposed to only looking at what the market is asking.

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  • Osler Update Dec 21, 2022

    Have the Katz been let out of the bag? Uncertainty about the standard of review for challenges to regulations

    Canadian courts have been split on the appropriate standard of review for challenges to regulations, applying the flexible “reasonableness” or...

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  • Osler Update Nov 15, 2021

    Supreme Court of Canada revisits the law of government liability in negligence

    Last month, the Supreme Court of Canada held that a municipality could be sued for negligent snow-clearing.

    Read more

Awards and Recognition

  • BISC Certificate in International Law, Queen’s University Faculty of Law (2017)
  • William – McDougall Memorial Award for Student Caseworkers, Queen’s Legal Aid Clinic (2017)
  • Law Clerk to the Hon. Justice David Stratas, Federal Court of Appeal (2020-2021)

Media Mentions

  • Osler News Mar 6, 2024

    Pro Bono Ontario’s 2023 ‘Honour Roll’ includes 13 Osler lawyers

    Pro Bono Ontario named 13 Osler lawyers to its second annual Honour Roll.

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Community Involvement

  • Student Caseworker, Queen’s Legal Aid Clinic (2016-2018)

Speaking and Writing

Published Work



  • Queen’s University, J.D. (2019)
  • Queen’s University, B.Sc. (Hons)


  • English