Duncan A.W. Ault


[email protected]

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Duncan is a partner in BLG’s Ottawa office whose practice focuses on civil litigation. He advises clients in a variety of corporate commercial litigation matters, including contractual disputes, shareholder disputes, class actions, commercial arbitrations, and directors’ and officers’ liability.

Duncan also has an active administrative and public law practice and acts for both governmental agencies and private interests. He has appeared before all levels of court in Ontario, as well as the Québec Court of Appeal and the Supreme Court of Canada.


  • Commission Counsel in the Elliot Lake Commission of Inquiry.
  • Counsel before the Ontario Court of Appeal and the Ontario Divisional Court for the Law Society of Upper Canada in Trinity Western University v. The Law Society of Upper Canada.
  • Counsel before the Federal Court of Appeal for Canadian National Railway Company against the Canadian Transportation Agency in two appeals challenging the Agency's revenue cap determinations for transportation of grain.
  • Counsel before the Ontario Superior Court for Canadian National Railway Company in a contractual dispute with the City of Thunder Bay.
  • Represented an international media company in a complex commercial arbitration involving a wide range of issues, including a dispute over certain post-closing working capital adjustments.
  • Represented a Canadian bank in pre-certification, certification and settlement stages of a large class action involving historic foreign exchange transactions on credit cards.
  • Represented Canwest Global Communications Corp. in its restructuring under CCAA proceedings.

Beyond our Walls

Professional Involvement

  • Member, Canadian Bar Association
  • Member, Ontario Bar Association
  • Member, The Advocates’ Society
  • Member, County of Carleton Law Association

Community Involvement

  • Volunteer, Pro Bono Law Ontario
  • Volunteer, LAWS Program
  • Volunteer Board Member, Friends of Humberside Collegiate Institute

Awards & Recognitions

  • Recognized in the 2022 edition (and since 2021) of The Canadian Legal Lexpert Directory (Litigation - Corporate Commercial) and the 2021 edition (Litigation - Securities)

Bar Admission & Education

  • Ontario, 2007
  • LLB, Université Queen’s, 2006