About Mary

Mary is a Vancouver partner whose litigation practice concentrates on complex commercial disputes and multi-party class actions, often arising from insolvency, restructuring or fraud. She acts for financial institutions, debtors, creditors, and court-appointed receivers and trustees, and has argued cases at every level of court in Canada, including as lead counsel before the Supreme Court of Canada. Her class action work has touched on opioids, automotive parts pricing and lithium-ion battery markets, and her broader practice draws on experience in mining, retail, real estate and forestry. Mary has taught insolvency law as an adjunct professor at the University of British Columbia and was appointed Queen's Counsel in 2018.

Practice areas

Class Actions Real Estate Law

Education & credentials

Law school
University of Windsor

Listing compiled from public sources in July 2026. Confirm Mary Buttery’s licence and standing in the Law Society of Ontario directory ↗