Service

Corporate and Commercial Disputes

Osler is home to a critical mass of top litigators in their respective fields — with the track records and the loyal and growing client base to prove it.

Osler’s disputes practice is one of the largest and most accomplished in Canada. Years of careful recruiting and rigorous training have allowed us to develop deep expertise in complex corporate and commercial litigation.

As experienced trial and appeal lawyers, our litigators appear as counsel in all levels of courts in Ontario, Alberta, Québec and most other Canadian provinces, as well as in the Federal Court and the Supreme Court of Canada. We also participate regularly in hearings before a variety of provincial and federal tribunals, including: the Financial Services Tribunal, the Ontario Municipal Board, the Environmental Assessment Board, the Ontario Securities Commission, and the Autorité des Marchés Financiers (AMF).

In addition to our trial expertise, we assist clients in identifying and mitigating risks that could lead to new legal exposures. We focus on developing a deep knowledge of each client’s business, which enables us to intervene effectively to avoid lengthy proceedings or to achieve cost-effective and innovative solutions through early prevention or alternative dispute resolution. Our discovery management specialists work strategically with our litigators and clients to deliver an array of customized, cost-effective and efficient discovery solutions. In short, Osler is home to a critical mass of top litigators in their respective fields — with the track records and the loyal and growing client base to prove it.

Ask us about:

  • Appeals
  • Class Actions
  • Competition/Antitrust Litigation
  • Constitutional and Public Law
  • Construction and Infrastructure Litigation
  • Corporate Governance and Securities Litigation
  • Cross-Border Litigation
  • Defamation (Libel and Slander)
  • Discovery Management
  • Energy and Natural Resources Litigation
  • Environmental Litigation
  • Franchise Litigation
  • Insolvency and Restructuring
  • Intellectual Property Litigation
  • International Commercial Arbitration and ADR
  • Municipal Litigation
  • Pensions and Benefits Litigation
  • Product Liability
  • Professional Negligence
  • Tax Dispute Resolution

Key Contacts

Sonia Bjorkquist

Partner, Disputes, Toronto

Mary Buttery, KC

Partner, Disputes, Vancouver

Mark A. Gelowitz

Partner, Disputes, Toronto

Éric Préfontaine

Partner, Disputes, Montréal


Representative Work


Latest Insights

  • Video Jan 9, 2024

    Business considerations in litigation

    When faced with a dispute, businesses must weigh a variety of factors to know what action to take. If you receive a claim, or think you have a claim a...

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    Business considerations in litigation
  • Blog Jul 10, 2024

    Long awaited U.S. Supreme Court ruling curtails SEC’s use of administrative courts

    On June 27, 2024, the United States Supreme Court (SCOTUS) released its ruling [PDF] on what has been a decade-long dispute between the Securities Exc...

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    Long awaited U.S. Supreme Court ruling curtails SEC’s use of administrative courts
  • Blog Jul 10, 2024

    Beware the contractual limitation period

    A recent Ontario court decision addressed the issue of a contractual limitation period. The decision is a reminder to parties to be mindful of their c...

    Read more
    Beware the contractual limitation period
  • Blog Jul 4, 2024

    Court decision reminds employers to avoid ‘two-step’ offers of employment

    In Adams v. Thinkific Labs Inc., 2024 BCSC 1129, a British Columbia trial court applied the doctrine of consideration at the employment contract forma...

    Read more
    Court decision reminds employers to avoid ‘two-step’ offers of employment
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Awards and Recognition

  • Chambers Canada: Canada’s Leading Lawyers for Business: Recognized in Litigation: General Commercial (Nationwide; Ontario; Alberta; Quebec)
    • “They really understand the business and they are extremely responsive. They don’t try and over-lawyer files and their answers are always practical.”
    • “They have good bench strength and have really taken the time to learn our business. They are bright, hard-working individuals.”
    • “They are excellent and I have really enjoyed working with them. They have some really great young talent.”
  • The Canadian Legal Lexpert Directory: Recognized in Corporate Commercial Litigation (Toronto, Ontario; Montréal, Québec; Calgary, Alberta); Professional Liability (Toronto, Ontario)
  • Legal 500: Recognized in Dispute Resolution (Alberta; Ontario; Québec)
  • Benchmark Litigation Canada: Recognized in Dispute Resolution (Ontario, Québec, Alberta); Osler lawyers recognized in Litigation and Dispute Resolution
  • Best Lawyers Canada: Recognized as “Law Firm of the Year” in the area of Corporate and Commercial Litigation (Canada), 2022

In the Media

  • Osler News May 14, 2024

    Osler one of the firms honoured as a winner of M&A Deal of the Year at the 2024 Canadian Law Awards

    The judges of the 2024 Canadian Law Awards named Rogers Communications’ $26 billion acquisition of Shaw Communications as winner of the M&A Deal o...

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    Osler one of the firms honoured as a winner of M&A Deal of the Year at the 2024 Canadian Law Awards
  • Osler News May 10, 2024

    Maureen Killoran, KC, named Energy/Resources Litigator of the Year at the 2024 Benchmark Litigation Canada Awards

    Osler is proud to announce that National Co-Chair Maureen Killoran, KC, has once again been named the Energy/Resources Litigator of the Year at the 20...

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    Maureen Killoran, KC, named Energy/Resources Litigator of the Year at the 2024 Benchmark Litigation Canada Awards
  • Osler News Apr 22, 2024

    Six Osler lawyers recognized by Who’s Who Legal Life Sciences — Canada

    Osler congratulations the six members of the firm who have earned the “Recommended” rating from Who’s Who Legal (WWL) Life Sciences — Canada.

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    Six Osler lawyers recognized by Who’s Who Legal Life Sciences — Canada
  • Media Mentions Jan 19, 2024

    Top 10 business decisions of 2023 – Law360 Canada

    Last year, in two sister cases, the Ontario Court of Appeal set out a two-step analysis to determine the meaning of “material change” within the conte...

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