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Laurence Ste-Marie


Member of the Quebec Bar since 2013
Member of the Ontario Law Society since 2011
Member of the Paris Bar since 2015

Languages: English, French

Laurence Ste-Marie is a dispute resolution and litigation lawyer focusing on domestic and international matters. She acts in Quebec in complex civil and commercial disputes, including class actions, and in commercial and foreign investment international arbitration.

Her experience spans over several fields and industries, notably financial services, engineering, construction, renewable energy, telecommunications and professional liability. Well-known and appreciated for her sound judgment, she also regularly handles sensitive matters entailing reputational stakes. Her versatility and adaptability allow her to provide tailored solutions to her clients.

Admitted to the Quebec, Ontario and Paris bars, Laurence previously practiced international arbitration in Paris. She was also a law clerk for Justice Marie Deschamps at the Supreme Court of Canada prior to pursuing her career in private practice.

Recent distinction


Civil and Commercial Litigation

Obtained a landmark decision on the nature of the bank transfer in favour of our client, the National Bank of Canada, in Co-Operators General Insurance Company v. Coop fédérée, 2020 SCC 41.

Acted for the Canadian affiliate of a tobacco company in defense of a $60 billion claim by the Government of Québec for the recovery of tobacco-related healthcare costs.

Obtained the dismissal of an application for an injunction and obtained a conviction for abuse of process for the Canadian affiliate of an international renewable energy company.

Represented a company against a financial institution in connection with an aborted financing transaction.

Obtained the revocation of a judgment compelling a university researcher to disclose her confidential data.

Representing and advising several senior executives facing defamatory lawsuits, which include securing a judgment awarding moral and punitive damages.

Representation of professionals in civil and disciplinary actions.

Class Action

Obtained authorization for class action against some Jehovah's Witnesses entities regarding their handling of sexual abuse of minors.

Representing an automobile financing company with respect to the fees required for the transfer of vehicle leases.

Representing a telecommunications company in connection with a service interruption.

Representing a private educational institution with respect to tuition fees during the state of health emergency declared as a result of COVID-19.

International Arbitration

Represented an international organization in an UNCITRAL arbitration involving one of its member States.

Acted as an assistant to the Tribunal in the ICSID arbitration United Utilities (Tallinn) B.V. v. Republic of Estonia (ICSID No. ARB/14/24)

Represented a European telecommunications company against an Iranian company in an ICC arbitration in the context of an alleged breach of an equipment sales contract.

Represented a South European engineering company against an American automated controlled systems manufacturer in an ICC arbitration regarding the failure of such system in a cogenerating energy plant.

Represented Turkish investors against the state of Turkmenistan in an ICSID arbitration regarding multiple breaches of the Turkish-Turkmen bilateral investment treaty in relation to 31 construction contracts.


  • Recognized inThe Legal 500 Canada - Rising Star in Quebec, a category that highlights “associates who make a material difference to the practice.”



Sherbrooke Seminar on Trial Advocacy, Barreau du Québec


York University, Osgoode Hall Law School - Juris Doctor (J.D.)
Maritime Booker Prize (highest standing in Legal Ethics)


Université de Montréal, Faculty of Law - Bachelor of Law (LL.B.)
2006-2009   Roll of Honour
2008   Robic Prize (highest standing in Intellectual Property)


Université du Québec à Montréal, Faculté de science politique et de droit, Baccalauréat en relations internationales et droit international (B.A.)
2006   Charles-Rousseau moot competition (International Public Law), best team prize and individual prize




Canadian Bar Association
Young Bar of Montreal
Young Canadian Arbitration Practitioners (YCAP)
The Advocates’ Society

Professional Activities

Member of the International Liaison Committee of the Bar of Montreal (2019 - present)
Member of the Young Patrons Committee of the Fondation de la Place des arts (2016-2017)


Canada Chapter in the GAR Know How: Commercial Arbitration, co-authored with Dina Prokic and Stephen L. Drymer (2020)

Quebec Chapter in Lexology Getting the Deal Through – Enforcement of Foreign Judgements, co-authored with Caroline Biron (2019)

Moderator of the Building your Arbitration Practice panel at the YCAP 2017 Fall Symposium