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Kate
Costin

she / her / hers Partner
  • kcostin@airdberlis.com
  • 416.865.7771
Office:
  • Toronto Office
Call to Bar:
Admitted to the Ontario Bar: 2017
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  7. Kate Costin

Kate approaches litigation matters calmly and attentively, helping clients navigate even the most stressful situations with confidence. She works closely with them to grasp the complexities of their disputes and leverages her strategic insight to develop creative strategies that respond to the unique circumstances of each case.

Kate is a member of the firm’s Litigation & Dispute Resolution and Construction Groups. Her general litigation practice encompasses a wide range of corporate-commercial matters such as shareholder disputes, oppression claims and partnership disagreements, as well as land and real estate litigation. Kate also advises on employment, construction and infrastructure issues, and acts in regulatory proceedings where she represents both prosecution and defence.

Kate has appeared before all levels of court in Ontario, as well as the Alberta and Saskatchewan Courts of King’s Bench, the Saskatchewan Court of Appeal and various administrative tribunals, including the Consent and Capacity Board and the Human Rights Tribunal.

Prior to joining Aird & Berlis, Kate practised at a nationally recognized litigation firm.

Expertise

  • Litigation & Dispute Resolution
  • Projects & Infrastructure
  • Construction

Professional Involvement

Memberships

  • Ontario Bar Association

Panellist, "Successful Advocacy Before Administrative Tribunals," Canadian Bar Association, November 20, 2025.

Speaker, "46th Annual Intensive Trial Advocacy Workshop (ITAW)," Osgoode Hall Law School Professional Development, 2025.

Related News

Firm News

Aird & Berlis Welcomes New Partner Kate Costin

September 17, 2025

Education

  • Certificate in Construction Law, Osgoode Hall Law School, 2023
  • JD, Schulich School of Law, Dalhousie University, 2016
  • AAS (Fashion Design), Parsons The New School for Design, 2010
  • BFA (Theatre), University of Victoria, 2008
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