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
Partner, Disputes, Toronto
Partner, Disputes, Vancouver
Partner, Disputes, Toronto
Partner, Disputes, Montréal
Latest Insights
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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...
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Blog Dec 16, 2024
Crowning a new kind of class: the Supreme Court of Canada finds B.C.’s multi-Crown class action is constitutional
We explore the decision and how it could pave the way for future interjurisdictional Crown cooperation and class action claims in the future.
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Osler Update Dec 13, 2024
New hearing ordered for historic youth-led Charter challenge to Ontario’s Cap and Trade Cancellation Act
The Court of Appeal for Ontario has revived a claim by youth activists who argue that the greenhouse gas emissions target set under Ontario’s Cap...
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Blog Dec 13, 2024
Amendments coming to Alberta’s Prompt Payment and Construction Lien Act and Public Works Act
Changes to the Prompt Payment and Construction Lien Act and Public Works Act aim to streamline payment processes and adjudication rules.
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Stay up to date with our latest insights
SubscribeAwards and Recognition
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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.”
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The Canadian Legal Lexpert Directory: Recognized in Corporate Commercial Litigation (Toronto, Ontario; Montréal, Québec; Calgary, Alberta); Professional Liability (Toronto, Ontario)
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Legal 500: Recognized in Dispute Resolution (Alberta; Ontario; Québec)
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Benchmark Litigation Canada: Recognized in Dispute Resolution (Ontario, Québec, Alberta); Osler lawyers recognized in Litigation and Dispute Resolution
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Best Lawyers Canada: Recognized as “Law Firm of the Year” in the area of Corporate and Commercial Litigation (Canada), 2022
In the Media
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Osler News Feb 20, 2025
Osler welcomes 14 new partners and three new counsel in 2025
Osler is pleased to announce the addition of 14 new partners and three new counsel across our offices in Toronto, Montréal, Calgary and Vancouver.
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Osler News Aug 1, 2024
Ankita Gupta appointed to Young Advocates Standing Committee
Ankita Gupta, an associate in the Disputes Group in our Toronto office, has been appointed to the Young Advocates Standing Committee (YASC) of The...
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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...
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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...
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