Skip to content.
This is a photo of Natalie Kolos

Natalie V.



Contact by email at [email protected]

t. +1 416-601-7807


Natalie V. Kolos is an associate in McCarthy Tétrault LLP’s Toronto Litigation Group and a member of the firm’s White Collar and Investigations and Securities Litigation groups. She maintains a general trial and appellate litigation practice, with a focus on white collar defence and investigations, securities litigation, criminal and constitutional law, professional liability, and commercial disputes. Her experience includes:

  • Acting as lead counsel at the trial and appellate level defending criminal charges, both summary conviction and indictable.
  • Representing individuals and major institutions in securities regulatory investigations, including with respect to cryptocurrency.
  • Advising private and public companies on criminal matters, including responding to enforcement processes.
  • Acting as co-counsel in a pre-charge certiorari application to quash a search warrant, which halted a long-standing criminal investigation into alleged billing fraud by a medical professional.
  • Obtaining a stay of proceedings in complex historical criminal prosecution for violation of the s. 11(b) Charter right to a speedy trial.
  • Defending physicians in professional liability cases before judges and juries, in motions, and on appeal.
  • Acting as counsel for public and private companies in a variety of commercial matters, including on applications, injunctions and appeals.

Natalie has appeared before all levels of Court in Ontario, including the Court of Appeal for Ontario, and the Supreme Court of Canada. She served as co-counsel to the Chamber of Commerce in Christine DeJong Medicine Corporation v. DBDC Spadina Inc., 2019 SCC 30, a leading case on corporate liability for wrongdoing of their officers and directors. In that case, the Supreme Court of Canada expressly adopted the Chamber of Commerce’s proposed clarification to the Canadian Dredge & Dock Co. v. The Queen, [1985] 1 S.C.R. 662 criteria for attributing criminal and civil liability to corporations.

Natalie is devoted to teaching and pro-bono. Natalie teaches Evidence at the LLM program at Osgoode Hall Law School, supervises law students for Pro Bono Students Canada on public interest matters, and serves as an executive member of McCarthy Tétrault’s pro bono criminal defence program in partnership with the University of Toronto’s Downtown Legal Services. She regularly acts as pro bono counsel in a variety of matters, including as pro bono counsel to civil liberties groups in matters of public importance before the Supreme Court of Canada. 

Natalie received her JD from Western Law, where she graduated on the Dean’s Honor List and received the J.S.D. Tory Writing Prize for excellence in writing and legal research. While in law school, Natalie was a research and editing assistant to two leading tort-law scholars and served as Deputy Editor-in-Chief of the Western Journal of Legal Studies. Natalie was also extensively involved in mooting, earning awards for her oral and written arguments on criminal and constitutional law, ethics, and public international law. Natalie was awarded the Martin Domke Award for Best Individual Oralist and the Eric Bergsten Award for Winner of the Moot at the international rounds in Vienna, Austria at the Willem C. Vis International Commercial Arbitration Moot. Before law school, Natalie obtained a BA (with High Distinction) in Political Science and an Honours BA in Law from Carleton University.

Natalie was called to the bar in 2018. She is a member of the Law Society of Ontario, the Ontario Bar Association, the Canadian Bar Association, the Criminal Lawyers’ Association, the Women’s White Collar Defense Association, and the Advocates’ Society. Natalie is currently serving as Member-at-Large for the Criminal Law Practice Group at the Advocates’ Society for the 2022-2023 term. 



  • Alan D. Gold and Natalie V. Kolos, “The Reverse Onus in Regulatory Offences: An Unconstitutional Historical Anomaly”, CanLII Authors Program, 2022 CanLIIDocs 37
  • Natalie V. Kolos, Courts of Justice Act Chapters, 17. Procedural Matters, Sections 108 - 123, 2022 CanLIIDocs 1081
  • Paul Morrison, Claire Seaborn, & Natalie V. Kolos, “Consolidated Contractors Group v. Ambatovy Minerals: Ontario Court of Appeal Reinforces Deference to Arbitration” (2018) Commercial Litigation and Arbitration Review
  • James Plotkin & Natalie V. Kolos, Canada, ch., Nikolaus Pitkowitz, eds., Handbook on Third-Party Funding in International Arbitration (New York: Juris, 2018)
  • Natalie V. Kolos, “Discretionary Coherence: Excluding the Private Law Liability of Public Authorities in Paradis Honey v. Canada” (2017) Cambridge Law Review
  • Natalie V. Kolos, “Deterring Compensation: Class Action Litigation and Damage Awards Against Corporate Defendants” (2017) Canadian Class Action Review