Tyr LLP is a trial-focused boutique in Toronto, covering the entire scope of litigation matters for multinational companies both domestically and internationally. Practice director James Bunting has a well-rounded experience of areas including appeals, franchise disputes and securities. Acting for a range of life sciences and technology companies, Melanie Baird is active in patent litigation, class action defence and commercial claims. Anisah Hassan is a key member of the team, and specializes in contract disputes and class action lawsuits.

Preeminent in Ontario for complex and high-stakes disputes, Davies Ward Phillips & Vineberg LLP has extensive experience before trial and appellate courts in Canada. Spearheading the practice, Kent Thomson has a longstanding reputation in securities cases, competition law and class actions. The group also benefits from Sandra Forbes, who stands out for her work defending clients in national and cross-border class actions, and Matthew Milne-Smith who is involved in insolvency proceedings and tort claims. Other key members of the team are Derek Ricci (fraud and telecoms cases), Luis Sarabia (contractual disputes and mining disputes), Chantelle Cseh (internal investigations and white collar matters) and Steven Frankel (pharmaceuticals and tech). At an associate level, Anisha Visvanatha is of note. Rui Gao was promoted to partner in January 2025. All lawyers mentioned work in Toronto.

Acting for domestic and international clients, Lax O'Sullivan Lisus Gottlieb LLP is a litigation-focused firm based in Toronto. The team is led by Jonathan Lisus and Matthew Gottlieb, who have a proven track record in complex commercial litigation. Lisus draws on over 30 years of experience in contract disputes and professional liability. Gottlieb is particularly impressive in insolvency litigation and fraud. Other active members of the group are Crawford Smith (class actions and securities), Paul Fruitman (shareholder disputes and oppression claims), and Andrew Winton (corporate governance and real estate disputes). Rahool Agarwal, Nadia Campion, Michael Currie and John Carlo Mastrangelo are other names to note. In January 2025, Shaun Laubman left the team, whilst Philip Underwood was promoted to partner. All individuals mentioned work in Toronto.

Lenczner Slaght is a reference in the market for dispute resolution matters in Ontario, representing public and private companies, governments and regulators. Monique Jilesen leads the team, focusing on class actions, injunctions and insolvency matters, with practice co-head Eli Lederman handling franchise disputes, commercial contracts and securities litigation. Standout members of the team include Peter Griffin KC, who has represented clients in numerous trials, arbitrations and appeals, and Tom Curry is rated for his work on business disputes, judicial reviews and professional liability matters. Matthew Lerner (real estate disputes and partnership disputes) and Brian Kolenda (professional negligence and defamation) are other names to note. David Doherty KC joined as senior counsel in September 2024, whilst Aaron Grossman and Martin Brandsma were promoted to partnership in January 2025.

With experience before all levels of court and tribunals across Canada, the Toronto litigation team at McCarthy Tétrault has in-depth knowledge of the mining, energy and retail sectors. The group is led by national lead Thomas Sutton and Ontario lead Julie Parla, who specializes in construction and procurement litigation. Counsel R Paul Steep is known for his work in complex securities litigation, whilst Geoff Hall offers a wealth of experience in contract and shareholder disputes. Sarit Batner has extensive trial and appellate experience. Other key members of the team include Adam Goldenberg (class actions and arbitrations) and Moya Graham (professional liability and infrastructure disputes). Fiona Legere and Junior Sirivar left the team in 2024, whilst Vasuda Sinha joined from Freshfields LLP in April 2025.

With a particularly active dispute resolution practice in Ontario, Bennett Jones LLP remains at the forefront of litigation in the energy, mining and aviation industries. Cheryl Woodin leads the team, offering a wealth of experience in class action defence and multi-jurisdictional litigation. Richard Swan has notable expertise in insolvency litigation and arbitrations, whilst Robert Staley is an authority on securities regulation and litigation. Focusing on shareholder disputes and professional negligence cases, Jonathan Bell is another name to note. Jeffrey Leon and James Patterson retired from the firm in December 2024. All lawyers mentioned work in Toronto.

Litigating in trial and appellate courts in Ontario, Blake, Cassels & Graydon LLP continues to be a leading firm for dispute resolution. Jointly leading the team, Catherine Beagan Flood’s broad expertise covers class actions on privacy, product liability and consumer protection issues; Iris Fischer has notable expertise in media and defamation cases. The group benefits from Michael Barrack, who has experience assisting corporations, governments and regulators with disputes. Other key members of the team include Jeff Galway (financial services disputes), Gordon McKee (product liability and class actions) and Bradley Berg (commercial and administrative disputes). Junior Sirivar joined the team in January 2025 from McCarthy Tétrault, and Pooja Mihailovich joined from Osler, Hoskin & Harcourt LLP. Daniel Szirmak was promoted to partner. All lawyers mentioned work in Toronto.

Stikeman Elliott LLP is home to a group of experienced litigators in Ontario, and is regularly sought out for its corporate litigation and arbitration expertise, such as contested take-over bids and shareholder claims. Eliot Kolers spearheads the team from Toronto, who is recommended for his expertise in corporate commercial litigation, class actions and securities litigation. Sinziana Hennig is also a key name to note for class action defence, including cross-border cases, and Aaron Kreaden’s broad practice includes complex negligence, product liability and directors’ and officers’ liability. Alexander Rose handles litigation relating to oppression, and insolvency proceedings. All lawyers mentioned are based in Toronto.

Torys has a strong dispute resolution team in Ontario, with particular expertise in shareholder defence and activism disputes in addition to commercial disputes. The group frequently advises high-net-worth individuals on litigation risk mitigation and crisis management. At the helm of the practice, Linda Plumpton is the go-to advisor for class action defence, securities and competition litigation. Practice co-head Sarah Whitmore is a key contact for financial institutions, technology companies and investors, and Andrew Bernstein focuses on public law and appellate work. Sheila Block has extensive experience in commercial litigation, intellectual property and defamation cases, whilst Gillian Dingle exhibits skill in civil litigation related to corporate and securities law.

The Ontario disputes group at Borden Ladner Gervais LLP works with its offices across the country to provide clients with nationwide strength in class actions defence, competition litigation and financial institution litigation. Leadership of the group is split between five partners: Patricia Morrison KC in Calgary, Kathleen McDormand in Ottawa, and David Di Paolo, Nadia Effendi and Brendan Wong in Toronto. Di Paolo has a high level of experience in securities litigation, class actions and shareholder disputes, Effendi regularly appears before all levels of federal and provincial courts, and Wong has a particular interest in fraud law.

Comfortably handling disputes from its Ontario office, Dentons is known for its work in corporate and commercial litigation, shareholder disputes and privacy litigation. The group also has a particularly strong class actions, securities and professional liability offering. Douglas Stewart leads the group in Toronto, with a focus on insurance-related matters. Matthew Fleming handles the full range of commercial litigation matters, including class actions, securities litigation and product liability, whilst Neil Rabinovitch is a key advisor to multinational corporations, financial institutions and developers. Mike Schafler is another key member of the team. All lawyers mentioned work in Toronto.

Fasken’s dispute resolution team in Ontario is noted for its strength in class action defence, product liability and securities litigation. The group has experience advising clients from the mining, financial services and healthcare industries, and often acts in multi-jurisdictional disputes. Practice head Sarah Armstrong stands out for her work in class action defence, with additional expertise in construction litigation. Peter Pliszka’s broad practice covers product liability, commercial disputes and insurance litigation, whilst Vera Toppings has trial and appellate experience across Canada. Pavel Sergeyev also comes highly recommended. Samuel Rickett, Steven Rosenhek and Tracy Pratt retired in 2024.

Led by Andrew Brodkin and Francy Kussner in Toronto, Goodmans LLP disputes practice in Ontario has a proven track record at both the trial and appellate level, and notable expertise in securities litigation and class action defence. Julie Rosenthal is reputed for her expertise in domestic and international arbitrations, whilst Peter Kolla is noted for his capabilities in M&A disputes. Alan Mark is well versed in class actions and has an in-depth understanding of electricity law and regulation, and Melanie Ouanounou handles a mix of contract disputes and product liability cases. David Conklin regularly advises clients on managing litigation risks.

Benefitting on the firm’s global presence, the Ontario litigation team at Norton Rose Fulbright is well-placed to advise on multi-jurisdictional disputes. The group is co-led by two partners: James Renihan covers all aspects of commercial litigation, including employment disputes, real estate matters and franchise disputes, and Tate McLeod advises financial institutions, employers and insurers in contract and tort disputes. Orestes Pasparakis (cross-border and securities litigation) and Andrew McCoomb (crisis management and international commercial arbitration) are also noted. Erika Anschuetz was promoted to partner in January 2025, whilst Norton Rose Fulbright departed the firm in July 2024. All lawyers mentioned work in Toronto.

With a strong commercial litigation practice in Ontario, Cassels is a reference in the market for corporate governance, oppression claims and litigation arising from M&A transactions. National lead John M. Picone is involved in shareholder disputes, class actions and securities-related regulatory proceedings. Ted Frankel has significant trial and arbitration experience, and handles disputes related to contracts, professional negligence and defamation, whilst Colin Pendrith covers franchise disputes, brand protection and shareholder disputes.

Baker McKenzie is rated for its dispute resolution practice in Ontario, which is adept at handling cross-border and complex enforcement disputes. John Pirie leads the team, acting for clients in corporate litigation involving breach of contract and competition law. David Gadsden has established experience in class actions, and Matthew Latella has notable expertise in arbitrations. Christina Doria is another key member of the team. All lawyers mentioned work in Toronto.

Drawing on the firm’s global presence, DLA Piper (Canada) LLP has an experienced litigation team in Toronto that is geared to support on public and private company litigation and class action work. Spearheading the practice from Toronto, David Foulds has a notable emphasis on disputes related to infrastructure projects, shareholder litigation and M&A disputes. Derek Bell is also recommended, showing proficiency across a range of matters including securities litigation, insolvency and competition litigation.