Mathieu Piché-Messier

Mathieu Piché-Messier

Ad. E.

Partner and National Business Leader, Commercial Litigation

[email protected]

Mathieu Piché-Messier is the national business leader of the Commercial Litigation Group. He has significant experience in both civil and commercial litigation, particularly in the areas of:

  • extraordinary remedies (injunction and freezing orders);
  • commercial fraud;
  • high technology;
  • industrial espionage;
  • identity theft;
  • competition law;
  • defamation law;
  • entertainment law;
  • intellectual property rights;
  • aviation law; and
  • international arbitration.

Mathieu was a member of the parliamentary committees of the National Assembly responsible for reform of the Québec Code of Civil Procedure. He was inducted as a Fellow of the American College of Trial Lawyers (ACTL) in 2018. He was also inducted as a Fellow of the Litigation Counsels of America in 2021.

He has acted for plaintiffs in preparing and enforcing seizures before judgment, injunctions and Anton Piller, Mareva and Norwich injunctions and orders. He has also acted as an independent supervisor solicitor for several Canadian law firms.



  • Has acted as an Independent Supervising Solicitor for several Canadian law firms, in civil and commercial law, and particularly in the following areas: commercial fraud and piracy, identity theft, high tech litigation, competition law, industrial espionage, shareholder disputes, unfair competition and intellectual property rights enforcement.
  • Has represented various clients before the Superior Court, the Court of Appeal, the Federal Court and various administrative tribunals in Québec.
  • Has been involved in negotiating, drafting and reviewing contracts in various areas of law, including commercial leases and IP licensing agreements.
  • Participated in the parliamentary committees of the National Assembly responsible for reform of the Québec Code of Civil Procedure.

Beyond Our Walls

Professional Involvement

  • Fellow, The Litigation Counsel of America (LCA)
  • Fellow, American College of Trial Lawyers (ACTL)
  • Member, American Bar Association
  • Member, International Bar Association
  • Fellow, American Bar Foundation
  • Member, The Advocates' Society
  • Member, Association of Certified Fraud Examiners, Montréal Division

Community Involvement

  • Member, Board of Directors, Cirque Éloize
  • Member, Board of Directors, Les Ballets Jazz de Montréal
  • Member, BLG Pro Bono Committee

Awards & Recognitions

  • Named Advocatus Emeritus (Ad. E.) of the Barreau du Québec 2022.
  • Recognized in the 2024 edition of The Best Lawyers in Canada® (Intellectual Property Law), since 2015 (Corporate and Commercial Litigation) and since 2021 (Privacy and Data Security Law).
  • Recognized in the 2024 edition (and since 2019) of Chambers Canada – Canada's Leading Lawyers for Business (Litigation: General Commercial - Québec).
  • Recognized in the 2024 (and since 2018) editions of Canadian Legal Lexpert® Directory (Litigation – Corporate Commercial).
  • Recognized in the 2024 edition (and since 2020) of Benchmark CanadaThe Definitive Guide to Canada's Leading Litigation Firms and Attorneys as one of the top 50 trial lawyers in Canada
  • Recognized in the 2023 edition of Who's Who Legal: Canada (Commercial Litigation).
  • Named “Québec Litigator of the Year” at the 2023 Benchmark Litigation Canada Awards.
  • Recognized in the 2023 edition (and since 2013) of Benchmark Canada – The Definitive Guide to Canada’s Leading Litigation Firms & Attorneys as a Local Litigation Star: Québec and a Litigation Star: General Commercial. Also recognized in the 2015 edition as a Future Star: Québec.
  • Recognized in the 2023 edition (and since 2020) of Lexpert Special Edition: Litigation
  • Recognized as Litigator of the Year, Québec, at the 2019 Benchmark Canada Awards.
  • Recognized as a leading litigator in the 2018 edition of the Lexpert®/Report on Business Litigation Special Edition.
  • Recognized by Lexpert® with a 2018 Zenith Award – Celebrating Mid-Career Excellence.
  • Inducted in 2018 as a fellow into the American College of Trial Lawyers (ACTL), an invitation-only fellowship in a selection by peers. It is restricted to no more than 1 per cent of lawyers in any state or province. Admittance only occurs after careful investigation to those experienced trial lawyers who the ACTL considers to have mastered the art of advocacy and whose professional careers have been marked by the highest standards of ethical conduct, professionalism, civility and collegiality.
  • Winner of the Benchmark Canada 2018 "Impact Case of the Year" award for the Julie Snyder v. John Doe et al. case
  • Mentioned, "Mathieu Piché-Messier chef du groupe de litige commercial chez BLG Montréal," Le Monde Juridique, November 2013.
  • Recognized as a "Rising StarTop 40 Under 40” by Lexpert® in 2011.

Bar Admission & Education

  • Québec, 1998
  • LLB, Université de Sherbrooke