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Sarah Armstrong

Sarah J. Armstrong

Partner Fasken
Adopting appropriate arbitration rules in addition to designating a supportive jurisdiction can allow you to utilize the significant benefits offered by international arbitration.
Jurisdiction Ontario, 2003
Language(s) English
Office(s) Toronto

Sarah Armstrong is the Vice-Chair of Fasken’s Ontario Litigation Department and Chair of the firm’s Arbitration Practice Group. An experienced litigator with broad litigation, arbitration and dispute resolution experience, she has developed a robust practice focused on commercial and contractual disputes and class actions.

Working with clients across a range of industries, including mining, automotive, professional services, health, retail and manufacturing, Sarah advises clients on commercial disputes, professional liability matters and employment litigation. Her class action experience includes securities, product liability and privacy cases, and she has advocated for clients at both the trial and appellate levels. Acting as lead counsel and co-counsel in matters before all levels of court in Ontario as well as before domestic and international arbitral tribunals, Sarah also has experience in administrative law matters, including acting as independent legal counsel to the discipline and fitness practice committees of the College of Physicians and Surgeons of Ontario.

While studying law at the University of Toronto, Sarah interned at Interights, an international human rights law advocacy group in London, England as part of the faculty of law’s International Human Rights Program (IHRP). She continues to be actively involved in the IHRP as a member of its Alumni Steering Committee.  Sarah also regularly advocates for children with disabilities in education law matters on a pro bono basis.

A member of the Board of Directors of the Advocates’ Society, Sarah is a frequent speaker and skills instructor on a wide range of topics related to litigation and advocacy. She is also a member of the firm’s Ontario Professional Development Committee.

Recognized as a leading litigator by legal directories, including Benchmark Litigation, the Canadian Legal Lexpert Directory, Best Lawyers and named a “Rising Star” by Lexpert in 2015, Sarah has also been recognized for her volunteer contributions to the University of Toronto Faculty of Law, the Pro Bono Law Ontario Education Law Project, and is a member of United Way Women United and the organizing committee for Covenant House Toronto’s annual Guts + Glory fundraising event.

  • Best Lawyers in Canada 2019, The Best Lawyers in Canada 2019
  • Named in Benchmark Litigation Canada, 2019
  • Canadian Legal Lexpert Directory for Class Actions, Canadian Legal Lexpert Directory 2018
Named in Benchmark Litigation Canada Recognized as Litigation Star in Class Actions and General Commercial in Ontario
2018 Canadian Legal Lexpert Directory Canadian Legal Lexpert Directory for Class Actions


  • LLB, (Dean's List) University of Toronto
  • BA (Honours) McMaster University

Community involvement

  • Director, The Advocates' Society and
  • Chair, Collegiality Mentoring and Membership Committee
  • Volunteer Lawyer, Pro Bono Law Ontario Education Law Project
  • Member, United Way Women United
  • Event Committee Member, Covenant House Guts+Glory
  • Member, Alumni Steering Committee, U of T Faculty of Law International Human Rights Program
  • Former Director, Working Skills Centre, Toronto  
  • Former Director, Canadian Lawyers for International Human Rights (CLAIHR)

Memberships & Affiliations

  • Member, The Advocates' Society 
  • Member, Canadian Bar Association
  • Member, Ontario Bar Association
  • Member, Toronto Lawyers' Association 
Newsletter Women in Commercial Law: Bringing Men Into the Conversation The Advocates Society, Advocacy Matters
Article Happiness First Advocacy Matters


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