Does the firm handle appeals as well as trials?

Yes. Lenczner Slaght has a dedicated appeals practice that argues cases before every level of court in Canada, including provincial courts of appeal, the Federal Court of Appeal and the Supreme Court of Canada.

Does Lenczner Slaght do arbitration work, or only court litigation?

Both. Arbitration is one of the firm's listed practice areas, and since 2024 a former longtime judge of the Court of Appeal for Ontario has served the firm as counsel while also sitting as an arbitrator and mediator on the Arbitration Place roster.

Is Lenczner Slaght only for large corporations, or does it work with individuals too?

Its client list is mostly corporate and institutional, but the firm's employment practice also acts for individuals in matters such as executive terminations, and its defamation and media work can involve individual clients as well as companies.

How long has Lenczner Slaght been practicing in Toronto?

The firm was founded in 1992 by five partners who left McCarthy Tetrault, making it more than 30 years old. It has been based at 130 Adelaide Street West in Toronto's financial district.

Where is Lenczner Slaght located and how do I contact the firm?

The office is at 130 Adelaide Street West, Suite 2600, Toronto. It can be reached at 416-865-9500, toll free at 1-877-805-7774, or by email at info@litigate.com for general inquiries.

Lenczner Slaght | LawOnline Directory

About Lenczner Slaght

Lenczner Slaght is a Toronto law firm that works only on litigation, arbitration and appeals, not general corporate practice. Alan Lenczner, Ronald Slaght, Michael Royce, Glenn Smith and Peter Griffin left McCarthy Tetrault to start the firm together in 1992, first under the name Lenczner Slaght Royce Smith Griffin. At the time, five partners leaving one of Canada's largest firms to build a litigation only practice was considered unusual in the profession. It's known today simply as Lenczner Slaght and is based at 130 Adelaide Street West in Toronto's financial district.

The firm's lawyers argue cases at every level of court and in arbitrations across the country, working on commercial litigation, class actions, intellectual property, securities, insurance, employment, construction, insolvency, competition and defamation matters. Its lawyers include a former Justice of the Supreme Court of Canada, who sat on the country's highest court for nearly 14 years before retiring in 2011 and now serves as of counsel to the firm, and a former judge of the Court of Appeal for Ontario, the longest serving judge in that court's history, who heard more than 6,000 appeals over 33 years before joining the firm as counsel in 2024. Lenczner Slaght has won Canadian Law Awards' Litigation & Dispute Resolution Boutique Law Firm of the Year seven years running, and has been recognized in the Lexpert Bull's Eye for a quarter century, ranking first in Toronto for litigation and commercial litigation in the 2026 Canadian Legal Lexpert Directory.

Practice areas

Civil Litigation & Dispute Resolution

Class Actions

Construction Law

Employment & Labour Law

Bankruptcy & Insolvency

Insurance Law

Intellectual Property

Personal Injury

Administrative & Regulatory Law

Business & Corporate Law

Health Law

Milestones & recognition

Founded in 1992 by five partners, Alan Lenczner, Ronald Slaght, Michael Royce, Glenn Smith and Peter Griffin, who left McCarthy Tetrault to start the firm as Lenczner Slaght Royce Smith Griffin.
A former Justice of the Supreme Court of Canada, who served nearly 14 years on the country's highest court before retiring in 2011, now serves as of counsel to the firm.
A former judge of the Court of Appeal for Ontario, the longest serving judge in that court's history and the second longest serving appellate judge in Canadian history, joined the firm as counsel in 2024 after 33 years on the bench and more than 6,000 appeals heard.
Named Litigation & Dispute Resolution Boutique Law Firm of the Year at the Canadian Law Awards for seven consecutive years, as of 2026.
Recognized in the Lexpert Bull's Eye for a quarter century and ranked first in Toronto for litigation and commercial litigation in the 2026 Canadian Legal Lexpert Directory, with 38 of its lawyers earning a combined 135 rankings across 21 practice areas that year.
Recognized in Chambers Global for the 24th consecutive year in 2026.

In the community

Sponsors the Gale Cup Moot and the Advocacy Competition in Legal Ethics and Professionalism.
Supports the Advocates' Society, the Ontario Bar Association and Young Women in Law, and its lawyers teach and lecture at the University of Toronto, Osgoode Hall and Western University law schools.
Runs a formal pro bono program and supports Pro Bono Law Ontario and the Refugee Law Office.
Supports the Barbra Schlifer Clinic, the Daily Bread Food Bank, the Heart and Stroke Foundation, the Yonge Street Mission, the United Way, the Canadian Civil Liberties Association and the Black Female Lawyers Network.
Runs ReferToHer, an initiative supporting women in law, alongside a formal inclusion, diversity, equity and accessibility program.

Good to know

Wheelchair accessible A calendar with a checkmark beside a clock

By appointment

Lawyers 90

This firm’s lawyers at a glance

Called to the bar: 1967–2025 · median 8 years in practice 60 of 90 lawyers
Law schools: University of Toronto (19), Osgoode Hall Law School (12), Queen's University (7), University of Ottawa (6), University of Western Ontario (6), Dalhousie University (3) and 5 more 60 of 90 lawyers
Languages on the roster: French

Who handles what

The neighbourhood

Lenczner Slaght's office is in Oxford Tower at 130 Adelaide Street West, part of the Richmond Adelaide Centre complex in Toronto's financial district. The complex connects into the city's underground PATH network, linking it to much of the downtown core. It's a fitting address for a litigation firm whose lawyers handle commercial litigation, securities, insolvency and other matters for corporate and institutional clients: the surrounding blocks are home to the head offices of several of Canada's biggest banks, along with the insurance companies and stockbrokers that work in the same industries as many of the firm's clients.

Frequently asked questions

What kind of law does Lenczner Slaght practice?: Lenczner Slaght works only on litigation, arbitration and appeals. Its lawyers handle commercial litigation, class actions, intellectual property, securities, insurance, employment, construction, insolvency, competition and defamation matters, rather than general corporate or solicitor work.
Does the firm handle appeals as well as trials?: Yes. Lenczner Slaght has a dedicated appeals practice that argues cases before every level of court in Canada, including provincial courts of appeal, the Federal Court of Appeal and the Supreme Court of Canada.
Does Lenczner Slaght do arbitration work, or only court litigation?: Both. Arbitration is one of the firm's listed practice areas, and since 2024 a former longtime judge of the Court of Appeal for Ontario has served the firm as counsel while also sitting as an arbitrator and mediator on the Arbitration Place roster.
Is Lenczner Slaght only for large corporations, or does it work with individuals too?: Its client list is mostly corporate and institutional, but the firm's employment practice also acts for individuals in matters such as executive terminations, and its defamation and media work can involve individual clients as well as companies.
How long has Lenczner Slaght been practicing in Toronto?: The firm was founded in 1992 by five partners who left McCarthy Tetrault, making it more than 30 years old. It has been based at 130 Adelaide Street West in Toronto's financial district.
Where is Lenczner Slaght located and how do I contact the firm?: The office is at 130 Adelaide Street West, Suite 2600, Toronto. It can be reached at 416-865-9500, toll free at 1-877-805-7774, or by email at info@litigate.com for general inquiries.

Where to find them

130 Adelaide St W, Suite 2600, Toronto, ON, Canada M5H 3P5 · 416-865-9500

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Listing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗