Claude Marseille, Ad. E.
Partner | Montréal
Montréal: 514-982-5089

Claude's litigation practice focuses on corporate and commercial litigation, class actions, construction law and shareholder remedies. He also has expertise in e-commerce law.

Claude has appeared before all levels of the courts in Quebec as well as the Federal Court of Appeal, the Federal Court of Canada and the Supreme Court of Canada. He has been involved in a number of commercial arbitrations, both as counsel and as designated arbitrator, and appeared before various administrative tribunals and boards.

Claude represents a wide range of clients such as manufacturers, financial institutions, transportation companies, franchisors, telecommunications companies, food conglomerates, real estate companies and public corporations.

  • Currently defending the interests of a major international pharmaceutical company in class actions respecting side effects allegedly caused by certain of its drugs and medical devices

  • Successfully defended the interests of flight schools respecting injunctive proceedings and a nuisance class action related to their activities on the south shore of Montreal

  • Successfully defended the interests of Amway Canada Corporation against a national class action alleging violations to the Competition Act, before the Federal Court and the Federal Court of Appeal of Canada

  • Successfully defended the interests of two rendering plants in the cities of Montréal and Lévis against nuisance class actions related to their operations

  • Successfully defended the interests of Canada's leading producer of ready-to-eat cereals and convenience foods in the context of a national class action alleging misrepresentation as to the caloric content of its reduced-sugar products

  • Successfully defended the interests of a Class 1 Canadian railway company against a nuisance class action related to its operations on the Island of Montréal

  • Counsel to the City of Montréal in the successful defence of a C$63-million lawsuit, one of the longest (376 days) and most complex trials in the history of Quebec, launched following the cancellation of a major a construction project for a mass-burn municipal solid-waste incinerator. The contract was a long-term Design-Build-Own-Operate agreement, precursor to current P3s. The case also gave rise to a precedent-setting decision by the Supreme Court of Canada on solicitor-client privilege.


Claude was awarded with the honorific title Advocatus Emeritus (outstanding lawyer) by the Barreau du Québec “to recognize the excellence of exemplary members and highlight an exceptional career”. He is also recognized as one of Canada's leading litigation lawyers in the following publications:

  • Chambers Canada: Canada’s Leading Lawyers for Business 2020 (Litigation: General Commercial)

  • The Best Lawyers in Canada - 2017, 2019 and 2020 (Class Action Litigation, Construction Law, Corporate and Commercial Litigation and Product Liability Law)

  • Who’s Who Legal: Life Sciences 2019 (Product Liability Law)

  • The Canadian Legal Lexpert Directory 2019 (Class Actions, Litigation - Corporate Commercial)

  • Benchmark Canada: The Definitive Guide to Canada's Leading Litigation Firms and Attorneys - 2018-2019 (Litigation Star - Class Action, Competition, General Commercial, Product Liability Finalist: “Litigator of the Year” for the Province of Quebec)

  • Acritas Stars: Independently Rated Lawyer - 2016 and 2018 (Nominated as a stand-out lawyer by senior in-house counsel)

He was also awarded the Lifetime Membership Award for "exceptional contribution to the goals of the association" by The Young Bar Association of Montreal.

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Co-author: East to West - Trends and Developments in Product Liability in Canada
Who's Who Legal, August 15, 2019.
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