About Liane Langstaff

Companies and municipalities dealing with environmental regulators get strategic advice and courtroom representation from Liane Langstaff, a partner in Gowling WLG's Toronto Environmental Law Group who also co-leads the firm's ESG Advisory Services practice. The work runs from approvals for large mining, energy and infrastructure projects to species at risk, climate change and constitutional challenges.

Science came first. Langstaff earned a BSc in Environmental Sciences at the University of Guelph in 2011, then completed the joint JD/MBA at Osgoode Hall Law School and the Schulich School of Business in 2015. A summer position in 2014 and then articling in Gowling WLG's Environmental Law Group led to a call to the Ontario bar in 2016, and a year later Langstaff clerked at the Court of Appeal for Ontario. Today that litigation grounding shows up in hearings before the Ontario Land Tribunal, the Divisional Court and the Federal Court, and in the carbon pricing references, where Langstaff was part of the Gowling WLG team acting for the Canadian Public Health Association at the Supreme Court of Canada.

Climate risk is a big part of the practice. As a Climate Governance Expert with the Canada Climate Law Initiative, Langstaff speaks with boards and corporate audiences about what climate change and biodiversity mean for them. Client work has included helping companies put corporate climate action plans into place, using carbon offsets to protect and draw value from forest and farm land, and training in-house and municipal legal teams on their ESG duties.

Teaching matters to Langstaff too. Osgoode students have had Langstaff as co-instructor of the environmental law course, and the faculty list for Osgoode's Certificate in ESG, Sustainability Climate Risk and the Law includes the partner's name. Langstaff also co-wrote A Guide to Canada's Impact Assessment Act (2020 Edition) for LexisNexis Canada.

Practice areas

Environmental and impact assessment

Municipalities and businesses bring Langstaff in when a large mining, energy or infrastructure project needs approval under Ontario's environmental assessment regime or the federal Impact Assessment Act. That can mean appearing at federal tribunal hearings, or backing up expert opinions on assessment procedure in international investor-state arbitrations.

Permits, compliance and land protection

Langstaff advises companies from Canada and elsewhere on getting permits and staying compliant with rules on species at risk, greenhouse gases, chemicals, waste and product stewardship. Local governments and businesses also turn to Langstaff when land needs protecting under species at risk or heritage legislation.

Environmental, constitutional and administrative litigation

Langstaff handles environmental litigation and enforcement matters for local governments and companies, appearing before the Ontario Land Tribunal, the Superior Court of Justice, the Divisional Court and the Federal Court, among others.

ESG and climate advisory

Clients get help with corporate climate action plans, carbon offsets on forest and farm holdings, and agreements that allocate carbon credit ownership, limit environmental liability or set carbon reporting and disclosure requirements.

Education & credentials

  • JD, Osgoode Hall Law School, York University (2015)
  • MBA, Schulich School of Business, York University (2015)
  • BSc (with Distinction), Environmental Sciences, University of Guelph (2011)
  • Called to the Ontario bar (2016)

Notable cases

Decisions where Liane Langstaff appeared as counsel, from public court records. Past cases don't predict future results.

Awards & recognition

  • Hennick Medal for Academic Excellence, Osgoode Hall Law School, York University
  • Arthur Charles Pape Memorial Prize for Native Rights, Osgoode Hall Law School, York University
  • Joseph-Armand Bombardier Scholarship, Schulich School of Business, York University
  • Ontario Co-op Student of the Year

Publications & speaking

  • A Guide to Canada's Impact Assessment Act, 2020 Edition (co-author), LexisNexis Canada (2020)
  • Contributor on Canadian climate change law, David Estrin's Business Guide to Environmental Law (2016 update) (2016)
  • ESG and the Role of the Board (panel), Women Get on Board, Toronto (2020)

Memberships & affiliations

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This listing was generated by AI from public sources in October 2026. It may contain errors, and we can’t guarantee it’s accurate or complete. Before you rely on anything here, verify it on their firm’s website. Confirm Liane Langstaff’s licence and standing in the Law Society of Ontario directory ↗

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