Christine Muir



Christine (Chris) Muir’s practice encompasses complex commercial litigation and high-profile administrative matters.

She specializes in complex litigation, including contract disputes, and public and appellate law. She also has experience advising on and managing defamation matters.

Chris acts as counsel for both plaintiffs and defendants. She represents clients ranging from large corporations and institutions to small business owners and professionals in sectors including health, finance, construction and education.

She has appeared as counsel before all levels of courts in Ontario and the Federal Court of Canada, and appears before administrative tribunals, including as Presenting Counsel before the Ontario Judicial Council.

Chris is committed to mentoring young lawyers and law students both within the firm and in the larger Toronto legal community. She is frequently asked to speak at legal conferences and industry events.

From 2009-2010, Chris served as a law clerk to the Chief Justice of Ontario, the Honourable Warren Winkler, and to Justices James MacPherson and David Watt of the Court of Appeal for Ontario.


  • Senior Counsel to the Honourable Louise Arbour, appointed to review sexual harassment and sexual misconduct in the Canadian Armed Forces and Department of National Defence.
  • Counsel for the University of Western before the Ontario Superior Court responding to a privacy-based challenge to the University’s COVID-19 vaccination policy in Hawke v. Western University.
  • Counsel for the Toronto Catholic District School Board before the Ontario Divisional Court in Del Grande v. Toronto Catholic District School Board.
  • Presenting Counsel before the Ontario Judicial Council concerning a complaint about the conduct of the Honourable Justice Donald McLeod.
  • Counsel for the Chief Electoral Officer of Canada, including before the Federal Court in Aryeh-Bain v. Attorney General of Canada.
  • Counsel for Japan Tobacco International (JTI) and R.J. Reynolds Tobacco International in a healthcare costs recovery dispute with the Ontario government.
  • Counsel before the Ontario Superior Court of Justice in numerous contract-based disputes, including shareholder disputes and oppression applications, and disputes involving allegations of economic harm, negligence, and defamation.
  • Advisory counsel to private and public health stakeholders, as well as public education institutions.

Beyond Our Walls

Professional Involvement

  • Member, The Advocates' Society
  • Member, Ontario Bar Association
  • Member, Canadian Bar Association
  • Member, Law Society of Ontario

Community Involvement

  • Duty counsel, Law Help Ontario
  • Volunteer, Refugee Sponsorship Support Program

Awards & Recognitions

  • Recognized in the 2024 (and since 2021) edition of The Best Lawyers in Canada (Corporate and Commercial Litigation)
  • Recognized in the 2023 and 2022 editions of The Canadian Legal Lexpert® Directory (Litigation - Corporate Commercial)
  • Recognized in the 2023 edition of Benchmark Litigation Canada as a "Future Star"
  • Recognized in the 2022 edition of Lexpert Special Edition: Litigation

Bar Admission & Education

  • Ontario, 2010
  • LLB, Université Dalhousie, 2009
  • M.Sc., Université Queen’s, 2004
  • B.Sc. (Hons.), Université Queen’s, 2002