Class Actions

Osler’s Class Actions Practice Group has successfully defended clients in many of the leading and complex class action cases in Canada. We have an excellent track record in opposing and defeating class certification and winning early dismissals in every major jurisdiction in Canada. Our class action team has broad and deep experience guiding clients through the most complex business-critical challenges. We offer:

  • Risk Mitigation – We work proactively with clients to develop risk-management strategies to avoid claims whenever possible and to be “litigation ready” when claims are commenced. Osler will rapidly mobilize the right team to assist in minimizing the impact of a class action through immediate management of processes and documents, aggressive early assessment and planning, probable risk assessment, budget controls and crisis communications.
  • National Coordinating Trial Counsel – Our lawyers serve in the role of national counsel across Canada and are able to respond to cases simultaneously across the country, including in Québec, where civil rules apply. We have ongoing experience in leading and coordinating multijurisdictional, U.S. and international cases.
  • Unmatched Research Capabilities – The research requirements for effective defence of a class action can be complex and detailed. Osler’s Research Department provides sophisticated support leading to precedent-setting results.
  • Thought Leadership – Our work has been instrumental in establishing leading principles of class action law, including the right of a defendant to defer the filing of a defence until after certification; the right to conduct examinations of representative plaintiffs in aid of certification; the nature of evidence to be filed on certification; the rules regarding solicitation of class members by plaintiff’s solicitors; and the necessity of considering the merits of the claim as part of the certification process.
  • Discovery Management – Our discovery management specialists have extensive experience in delivering customized, cost-effective and efficient discovery solutions in complex multijurisdictional class actions.


The Canadian Legal Lexpert Directory ranks Osler as “most frequently recommended” for class actions expertise. Osler is also recognized for Dispute Resolution: Class Action (Defence) in Chambers Global: The World’s Leading Business Lawyers, with one client noting that “they are team-focused, they know our business and they take long-term strategic positions.” Another client says that “the firm is a well-oiled machine and I wouldn't hesitate to recommend them for large country-wide litigation matters."