Department profile
Osler, Hoskin & Harcourt LLP

Litigation: General Commercial

Canada Guide 2026 : Alberta

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Osler, Hoskin & Harcourt LLP

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About

Provided by Osler, Hoskin & Harcourt LLP

With active matters in all western provinces, Osler’s litigation group has strong expertise and a proven track record in Western Canada. The Western Canada Litigation Practice includes (i) Disputes / Litigation, (ii) Regulatory / Environmental / Indigenous / Land Litigation and (iii) Tax Litigation. Osler prides itself on its “one-firm” approach and its teamwork – within Western Canada, nationally, and among practice areas. Osler’s litigation team focuses on business-critical litigation and, in so doing, has become a recognized leader in corporate commercial, securities, governance, class action, energy, construction, tax, administrative, major projects, natural resources and renewable energy, indigenous, constitutional, and environmental law litigation.

Chambers Review

Provided by Chambers

Litigation: General Commercial - Alberta

Band 2

What the Team is Known For
Osler, Hoskin & Harcourt houses a high-level commercial and energy industry disputes practice, rated for its strong bench of experienced litigators. The Calgary group has a solid track record in high-stakes breach of contract litigation, as well as experience in a range of other areas including class proceedings, securities litigation and shareholder disputes. The group has also represented clients in litigation relating to constitutional and administrative law. The team leverages the firm's strong national platform to provide high-quality advice on multi-jurisdictional files. Clients also benefit from the firm's complementary practices in regulatory and appellate litigation.
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Work Highlights

Provided by Chambers

  • Osler, Hoskin & Harcourt represented TikTok Technologies Canada in a judicial review of the decision of the Governor in Council to require TikTok to windup its Canadian operations under the Investment Canada Act.

Strengths

Provided by Chambers

  • The Osler team gets up-to-speed on highly technical matters very quickly and effectively communicates.

    Litigation: General Commercial respondentCanada

  • The team has excellent planning and strategy. The communication with Osler is first class.

    Litigation: General Commercial respondentCanada

  • The team at Osler is very business-minded and totally focused on the client's interests.

    Litigation: General Commercial respondentCanada

  • The firm is highly knowledgeable and gives very strong support when necessary.

    Litigation: General Commercial respondentCanada

  • The Osler team is very smart and anticipates where the case is going to find solutions.

    Litigation: General Commercial respondentCanada

Notable Practitioners

Provided by Chambers

  • Maureen Killoran
    Maureen Killoran

    Maureen Killoran

    Maureen Killoran KC is recognised for her handling of major litigation files in the energy and natural resources sector. Her experience includes representing both public bodies and private clients in constitutional challenges, appellate proceedings and judicial reviews, alongside her commercial dispute resolution practice. She is Osler, Hoskin & Harcourt's national co-chair and splits her time between the Calgary and Vancouver offices.

    • She is one of the best litigators in Canada.

      Litigation: General Commercial respondentCanada

    • Maureen Killoran is a top-notch litigator.

      Litigation: General Commercial respondentCanada

    • She is a superb lawyer.

      Litigation: General Commercial respondentCanada
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  • Tristram Mallett
    Tristram Mallett

    Tristram Mallett

    Skilled corporate litigator Tristram Mallett is noted for his expertise with contentious securities and M&A mandates. He has also represented clients in product liability, privacy and contractual lawsuits, covering both single-plaintiff and class proceedings. He is based in Osler, Hoskin & Harcourt's Calgary office.

    • Tristram has deep commercial knowledge.

      Litigation: General Commercial respondentCanada

    • I truly enjoy working with Tristram and his team.

      Litigation: General Commercial respondentCanada

    • Tristram Mallett is top notch and did a terrific job on our file. We are very impressed with him.

      Litigation: General Commercial respondentCanada
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  • Olivia Dixon
    Olivia Dixon

    Olivia Dixon

    Olivia Dixon acts for clients in a range of commercial disputes, with a particular focus on energy litigation, construction litigation and international commercial arbitration. She is based in Osler, Hoskin & Harcourt's Calgary office.

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  • Matthew Huys
    Matthew Huys

    Matthew Huys

    Matthew Huys is a Calgary-based litigator with particular experience in the construction and energy sectors.

    • Matthew is excellent in his handling of litigation. He's very communicative and takes into account commercial matters.

      Litigation: General Commercial respondentCanada
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Ranked Individuals at Osler, Hoskin & Harcourt LLP (4)

Alberta

Members

Provided by Osler, Hoskin & Harcourt LLP

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