Jacob Mantle

Jacob Mantle

Associate, Competition, Trade and Foreign Investment

Contact Information


tel: 416.862.4864



Bar Admission

Ontario, 2017


Queen’s University, JD

Canadian Society of Customs Brokers, Certified Customs Specialist, 2020

National University of Singapore, Faculty of Law, JD Exchange Program

Queen’s University, BA (Hons.)



Jacob is a senior associate in the Competition, International Trade and Foreign Investment Group of our Toronto office. He assists both domestic and international clients on trade disputes and cross-border regulatory matters, including customs, economic sanctions, anti-dumping and countervailing duty, and investment dispute litigation. Jacob provides advice to businesses regarding customs compliance (including Canada’s forced labour import ban), procurement, economic sanctions, and export controls, and to government clients on free trade agreements and World Trade Organization (WTO) matters. Jacob regularly appears before the Canada Border Services Agency, Canadian International Trade Tribunal, and Federal Courts.

Prior to joining Osler, Jacob worked at another Canadian law firm.

    POSCO in connection with Canadian antidumping investigations and enforcement proceedings

    Husteel Co. Ltd and Husteel Canada Co. Ltd in connection with Canadian antidumping and countervailing duty investigations and enforcement proceedings

    Prior to joining Osler:

    A coalition of plywood importers in connection with a successful no injury finding before the Canadian International Trade Tribunal (case NQ-2020-002), and a successful dismissal of an application for judicial review (Canadian Hardwood Plywood and Veneer Association v Canada (Attorney General), 2023 FCA 154).

    LNG Canada and The Canadian Coalition for Construction Steel in connection with a safeguard inquiry before the Canadian International Trade Tribunal, successfully arguing against the implementation of a definitive safeguard measure on certain steel products (case GC-2018-001). 

    The Government of the United Kingdom in the negotiation of free trade and investment agreements.

    The Government of Ontario in the CUSMA/USMCA negotiations.

    A global automotive company on CUSMA/USMCA rules of origin.

    A global fashion retailer in connection with establishing e-commerce fulfillment operations in Canada, including successfully accessing customs duty and GST relief.

    A global footwear retailer in connection with a Canada Border Services Agency customs compliance verification.

    An Ontario Municipality in designing procurement rules compliant with the Comprehensive Economic and Trade Agreement (CETA) between Canada the European Union.

    Ashley Furniture Industries in connection with Canadian antidumping and countervailing duty investigations and enforcement proceedings.

    Delivering capacity-building seminars covering anti-dumping, countervailing duty, and safeguard investigations to a Southeast Asian Government.

    An electric power generation company in connection with compliance with Canada’s import ban on goods produced by forced labour.

  • Chambers Canada: Canada's Leading Lawyers for Business: Recognized in International Trade/WTO (Nationwide)

  • Sessional Lecturer, Queen’s University Faculty of Law
  • Guest Lecturer, Queen’s University Faulty of Law, International Law Programs, Bader College Herstmonceux Castle, East Sussex, United Kingdom

  • Christian Legal Fellowship of Canada
  • Canadian Society of Customs Brokers
  • National Customs Brokers & Forwarders Association of America
  • American Association of Exporters and Importers
  • Transparency International
  • Ontario Bar Association
  • International Bar Association

Importing into Canada: Overview, Thomson Reuters Practical Law, March 2023

The Year in Review (Canada), American Bar Association, 2019 to Present