Guy Pratte

Guy J. Pratte Ad. E.


Executive Summary

Guy Pratte is a partner in BLG's Litigation and Arbitration Groups, and he is the Leader of the Appellate Advocacy Group.  He divides his time between BLG's Toronto, Ottawa and Montréal offices. Guy focuses his practice on commercial litigation (including class actions), administrative law and constitutional law, and is consistently recognized as a leading lawyer in these areas by the foremost legal rankings directories, although he is also often retained in complex cases of all types.

A Fellow of the American College of Trial Lawyers, Guy pleads frequently before the Supreme Court of Canada as well as before the Superior and Appeal Courts of Ontario and Québec, and the Federal Court and Federal Court of Appeal.

Guy has received the Law Society of Ontario Medal in 2019 for exceptional career achievement and contribution to his community. The Ontario Bar Association awarded Guy the OBA Award of Excellence in Civil Litigation in 2019. He was also named Advocatus Emeritus by the Québec Bar for "outstanding contributions to the legal profession."



Guy Pratte on Pro Bono at BLG​

Guy Pratte, a partner at Borden Ladner Gervais LLP (BLG) and form​er chair of the Firm's National Council, discusses BLG's Pro Bono Program and explains why the Firm believes providing access to justice is a key component of our national platform.​

Representative Work

  • Supreme Court of Canada appearances:
    • Trinity Western University v. Law Society of Upper Canada (under reserve; heard Nov-Dec 2017);
    • Deloitte & Touche v. Livent Inc., 2017 SCC 36875;
    • World Bank Group v Wallace, 2016 SCC 15;li>
    • Canadian National Railway Co. v. Canada (Attorney General), 2014 SCC 40;
    • Hinse v. Canada (Attorney General), [2013] S.C.C.A. No. 448;
    • Québec (Attorney General) v. A, 2013 SCC 5;
    • Cinar Corporation v. Robinson, 2013 SCC 73;
    • S.L. v. Commission scolaire des Chênes, 2012 SCC 7;
    • Canada (Attorney General) v. PHS Community Services Society, 2011 SCC 44;
    • Bou Malhab v. Diffusion Métromédia CMR Inc., 2011 SCC 9;
    • Ontario (Public Safety and Security) v. Criminal Lawyers’ Association, 2010 SCC 23;
    • Canadian National Railway Co. v. Royal and Sun Alliance Insurance Co. of Canada, 2008 SCC 66;
    • Chaoulli v. Québec (Attorney General), 2005 SCC 35; and
    • Finney v. Barreau du Québec, 2004 SCC 36.
  • Selected federal and provincial court appearances:
    • Lead counsel for Canadian National Railway Co. in appeal before Federal Court of Appeal against Richardson International Ltd.
    • Lead counsel for the Board of Internal Economy and The Honourable Andrew Scheer, Speaker of the House of Commons, in several judicial review applications commenced by the NDP in the Federal Court;
    • Lead counsel for the Law Society of Upper Canada in judicial review application commenced by Trinity Western University (Ontario Divisional Court);
    • Commissioner of Official Languages of Canada v. CBC/Radio-Canada, 2014 FC 849 (Federal Court);
    • McCracken v. Canadian National Railway Co., 2012 ONCA 445(class certification reversed on appeal, Ontario Court of Appeal);
    • Pelletier v. Canada (Attorney General), 2008 FC 803.
  • Independent Counsel for the Canadian Judicial Council in the matter of certain allegations made against ACJ Douglas of the Manitoba Court of Queen’s Bench, 2011-12.
  • Lead Counsel for the Right Honourable Brian Mulroney before the Oliphant Commission of Inquiry, 2008-10.
  • Lead Counsel for Mr. Jean Pelletier (former Chief of Staff to the Right Honourable Prime Minister of Canada, Jean Chrétien) before the Commission of Inquiry into the Sponsorship Program and Advertising Activities and the Federal Court and Federal Court of Appeal.
  • Lead Counsel for JTI-MacDonald and RJR Tobacco Companies in connection with ongoing healthcare costs recovery actions brought by the Governments of Ontario ($50 billion) and Québec ($60 billion).
  • Lead Counsel for JTI MacDonald in respect of ongoing tobacco-related class actions in the Province of Québec ($20 billion).

Publications & Presentations

  • Moderator, "Fireside Chat on Advocacy," The Advocates Society, September 9, 2019.
  • Speaker, "An Evening with Mr. Justice Robert Sharpe of the Ontario Court of Appeal”  Toronto Lawyers Association, May 15, 2019.
  • Speaker, "Ottawa Courthouse: The Effective Witness," The Advocates Society, April 29, 2019.
  • Speaker, “Appellate Advocacy – a Different Skill Set,” International Bar Association Annual Litigation Forum – Advocacy in the 21st Century.
  • Author, "The Advocate's Purpose," The Advocates' Journal.
  • Author, "The Advocate's Calling," The Advocates’ Journal.
  • Speaker/Author, “Oral Advocacy at the Supreme Court of Canada,” 11th Annual Spring Symposium, Advocates’ Society and American College of Trial Lawyers.
  • Co-Author, “Faire Appel en Cour Suprême : Permission, Mémoire, Plaidoirie” chapter, LegisPratique:  Recours et procédure en appel, Montréal: LexisNexis Canada.
  • Author, “Lincoln and the Modern Practice of Law,” The Advocates’ Journal.
  • Co-Author, “Les Conflits d’intérêts de l’avocat : perspectives québécoises et canadiennes” Droit de la personne: éthique et droit: nouveaux défis, Cowansville, Québec: Éditions Yvon Blais.
  • Author, “Summary Judgment Motions: Recent Judicial Developments,” Superior Court of Justice (Ontario) Spring Education Seminar.
  • Author, “Experts in Civil Litigation”: A Retrospective on Their Role and Independence with a View to Possible Reforms,” Annual Review of Civil Litigation, 169-202.
  • Author, “Experts on Experts,” CCLA Civil Litigation Update.
  • Speaker/Author, “The New Administrative Law – Standards of Review: Are We There Yet?” Law Society of Upper Canada (LSUC) Divisional Training Session.
  • Speaker/Author, “The Role of Legal Counsel in Policy and Decision-Making,” The Canadian Institute’s 6th Annual Advanced Administrative Law & Practice Conference.
  • Speaker/Author, “The Standard of Review Battle:  Is Anyone Winning?,” Osgoode Professional Development 2nd National Forum entitled “New Directions in Administrative Law and Practice”.
  • Speaker/Author, “The Chaoulli Decision: What Does it Mean For Canadians?,” Canadian Bar Association Annual Meeting.
  • Speaker/Author, “Chaoulli and the Restructuring of Health Care in Canada,” Osgoode Professional Development One-Day National Summit.
  • Facilitator, “Implications of the Chaoulli Judgment for the Health Insurance Sector,” Northwind Professional Institute’s Annual Health Insurance Strategic Forum.
  • Speaker, “Demystifying the Standard of Review,” Panel Discussion entitled “Making Sense of the Standard,” Osgoode Professional Development – New Directions in Administrative Law & Practice, The National Forum.
  • Speaker/Author, “Liability of Public Agencies,” Canadian Bar Association National Civil Litigation CLE Conference.
  • Author, “Appeals, Judicial Review and Standard of Review,” Public Law reference materials, Bar Admission Course, Department of Education, Law Society of Upper Canada.
  • Speaker/Author, “Cross-Canada Year in Review: Key Administrative Law Decisions and Their Implications,” Canadian Institute’s 4th Annual Law Conference.
  • Speaker/Author, “On the Teaching and Learning of Advocacy:  Some Personal and Informal Remarks,” The Advocates’ Society, Task Force on Advocacy.
  • Author, “The Norwich Pharmacal Principle and its Utility in Intellectual Property Litigation,” 24 Advocates’ Quarterly 301.
  • Speaker/Author, “Tests for Judicial Review: The 2001 Version,” Civil Litigation Updated Conference.
  • Author, “What Makes a Country: Trudeau’s Future as a Leader,” In Trudeau’s Shadow: The Life and Legacy of Pierre Elliot Trudeau (Cohen and Granatstein, editors), Toronto.
  • Speaker/Author, “The Deemed Undertaking Rule,” Civil Litigation Updated Conference.
  • Author, “To Be or Not to Be an Advocate,” 13 Advocates’ Society Journal No. 19.
  • Author, “The Relevance of Comparative Law: A Critique of Alan Watson’s ‘The Making of the Civil Law,’” 40 University of Toronto Faculty of Law Review 115.

Testimonials & Rankings


"Guy is one of the best lawyers in Canada and has been excellent as lead counsel on all of our matters... He has the trust of the upper management and the respect from all courts."
Benchmark Canada

"He's outstanding. A 'hard working' and 'dynamic' practitioner who receives praise for 'always adding value' for his clients."
Who's Who Legal

"He is singled out for the depth of his experience and is considered to be 'at the top of his field' by his peers…he’s always included in major cases."
Chambers Global

"One of the best civil litigators in the country."
— Canadian Lawyer Magazine

"A most principled man."
National Post

"Guy Pratte is unanimously name-checked across Ontario, as well as several other provinces, and someone who frequently finds himself on the front lines of some of Canada’s most high-profile and contentious matters."
Benchmark Litigation


  • Recognized in the 2020 edition (and since 2016) of Chambers Canada - Canada's Leading Lawyers for Business (Litigation - General Commercial: Ontario) (Litigation: Administrative & Public Law). Sources say he "has a stellar reputation" as "one of the finest lawyers in the country."
  • Recognized in the 2019 edition (and since 2013) of Chambers Global — The World's Leading Lawyers for Business (Dispute Resolution: National (Band 1)). Chambers Global says that, “Guy Pratte is lauded for his proficiency in commercial litigation and his involvement in high-stakes class actions. He stands out for his strong track record before both the Ontario and Québec courts, as well as before the Supreme Court of Canada.” Sources say,  he “has a stellar reputation" as "one of the finest lawyers in the country."
  • Recognized by the 2018 Benchmark Canada Awards as "Hall of Fame Lawyer of the Year".
  • Recognized in the 2018 edition of The Best Lawyers in Canada® - Lawyers of the Year as the "Ottawa Administrative and Public Law Lawyer of the Year" and as the "Ottawa Appellate Practice Lawyer of the Year".
  • Selected by peers for inclusion in the 2020 edition (and since 2006) of The Best Lawyers in Canada® (Administrative and Public Law) (Appellate Practice) (Class Action Litigation) (Corporate and Commercial Litigation).
  • Recognized in the 2019 edition (and since 2014) of Legal 500 Canada as a "Leading Lawyer (Dispute Resolution: Québec)". Ranked in the 2015 edition as a "Leading Legal Professional".
  • Recognized in the 2019 edition (and since 2013) of Benchmark Canada - The Definitive Guide to Canada's Leading Litigation Firms and Attorneys as one of the "Top 50 Trial Lawyers in Canada (Class Action; Constitutional) (General Commercial)" and as a "Local Litigation Star: Ontario". Benchmark Canada reports that "Guy Pratte is unanimously name-checked across Ontario, as well as several other provinces, and is someone who frequently finds himself on the front lines of some of Canada's most high profile and contentious matters."
  • Recognized in the 2019 edition of Canadian Legal Lexpert® Directory (Litigation - Corporate Commercial) (Litigation - Public Law) (Litigation - Directors' & Officers' Liability) (Class Actions) (Litigation - Defamation & Media) (Energy - Electricity) (Energy - Oil & Gas).
  • Recognized as a leading energy lawyer in the 2019 edition (and since 2013) of the Lexpert®/Report on Business Special Edition on Energy.
  • Recognized in the 2017 8th edition of Who's Who Legal: Canada (Commercial Litigation).
  • Recognized in the 2017 edition (and since 2012) of the Lexpert® Guide to the Leading U.S./Canada Cross-Border Litigators (Corporate Commercial) (Class Actions).
  • Recognized in the 2018 edition (and since 2013) of The Lexpert®/American Lawyer Guide to the Leading 500 Lawyers in Canada (Litigation - Corporate Commercial: Ottawa, Toronto).
  • Recognized as a leading litigator in the 2018 (and since 2013) edition of the Lexpert®/Report on Business Litigation Special Edition.
  • Recognized in the 2016 (and since 2013) edition of Benchmark Canada — The Definitive Guide to Canada's Leading Litigation Firms and Attorneys  as a "Local Litigation Star: Ontario" and a "Litigation Star: Class Actions, Commercial, Constitutional". Benchmark Canada reports that, "Guy Pratte is unanimously name-checked across Ontario, as well as several other provinces, and someone who frequently finds himself on the front lines of some of Canada's most high profile and contentious matters.
  • Recognized in the 2016 and 2015 editions of Who's Who Legal: Commercial Litigation. Also recognized in the 2016 Who's Who Legal: Canada (Commercial Litigation) and the 2013 Who's Who Legal: Commercial Litigation and Who's Who Legal: The International Who's Who of Business Lawyers. Who's Who Legal says that, "Guy Pratte is known for his 'solutions-oriented approach' and is considered a 'leading trial lawyer'."
  • Awarded by Pro bono Québec in 2014 with the prestigious St. Yves Medal for his pro bono work.
  • Lexpert® Zenith Award for the Réjean Hinse — wrongful conviction civil lawsuit (Pro Bono Team of the Year – Firm), 2011.
  • Profiled in: "Art of the Case: All or Nothing," LEXPERT®, "L'avocat qu'on s'arrache," La Presse, 2008; "Pratte à Porter," Canadian Lawyer.
  • Martindale-Hubbell® Distinguished™ Peer Review Rated.