Mark Donald Law
1 lawyer · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 794 handling Civil Litigation & Dispute Resolution.
About Mark Donald Law
Mark Donald Law is a litigation firm in downtown Toronto founded in 2016 by Mark Donald, who was called to the Ontario bar in 2013. The practice handles civil and commercial litigation, defamation, privacy and media law, appeals and judicial reviews, bankruptcy and insolvency litigation, real estate and estate litigation, and human rights matters. It acts for both plaintiffs and defendants, including businesses, media organizations, and individuals, and has appeared before the Ontario Superior Court of Justice, the Ontario Court of Appeal, and the Human Rights Tribunal of Ontario.
The firm has built a particular focus on defamation and online reputation, including anti-SLAPP motions that seek early dismissal of lawsuits aimed at silencing public criticism. Mark Donald has been named Canada's contributor to the Chambers Global Practice Guide for Defamation and Reputation Management for both the 2025 and 2026 editions, and co-authored a chapter on the law of online reviews in the LexisNexis text Social Media and Internet Law: Forms and Precedents. As a law student, Mark Donald was a summer student with the Canadian Civil Liberties Association, monitoring the G20 summit held in Toronto to help protect protesters' rights.
Practice areas
Milestones & recognition
- Mark Donald Law was founded in 2016 by Mark Donald, who was called to the Ontario bar in 2013.
- Mark Donald has been named Canada's contributor to the Chambers Global Practice Guide for Defamation and Reputation Management, in the 2025 and 2026 editions.
- Mark Donald co-authored the chapter 'What Is Your Rating? The Law of Online Reviews' in Social Media and Internet Law: Forms and Precedents, 2nd edition, published by LexisNexis.
- As a law student, Mark Donald was a summer student with the Canadian Civil Liberties Association and monitored the G20 summit in Toronto to help protect protesters' rights.
- Mark Donald is a member of the Canadian Media Lawyers Association.
In the community
- In April 2017, Mark Donald addressed the Philippine Press Club of Ontario's annual general meeting on journalistic responsibility, defamation, and the importance of a free press.
Good to know
Wheelchair accessibleWho handles what
The neighbourhood
Mark Donald Law's office is at 3 Church Street in Toronto's Old Town, inside a red brick building built in 1914 in the Edwardian Classical style. The building is designated under the Ontario Heritage Act and sits within the St. Lawrence Neighbourhood Heritage Conservation District. It has been restored around its original heavy timber frame, with wood columns and beams, brick feature walls, and a lobby finished in slate and oak, rather than replaced with the glass and steel of much of downtown Toronto's office core.
The address places the firm in the St. Lawrence Market area. It's a lower rise, market and residential corner of downtown Toronto, known for its restaurants and shops, a different setting from the office towers a few blocks north and west.
Frequently asked questions
- Does Mark Donald Law handle defamation and online reputation cases?
- Yes. The firm handles defamation, privacy, and media law matters for both plaintiffs and defendants, including anti-SLAPP motions aimed at getting meritless lawsuits over public commentary dismissed early.
- I was sued over a negative online review I posted. Can Mark Donald Law help?
- The firm has specific experience with online review and reputation disputes. Mark Donald co-authored a chapter on the law of online reviews for a LexisNexis text on social media and internet law, and the firm has acted in anti-SLAPP motions arising from public criticism.
- Does the firm represent businesses in commercial litigation?
- Yes. Mark Donald Law acts for and against businesses in contract, shareholder, and partnership disputes, professional negligence claims, debtor and creditor matters, and construction lien disputes.
- Can Mark Donald Law help with a bankruptcy or insolvency dispute?
- Yes. The firm maintains a dedicated bankruptcy and insolvency litigation practice alongside its corporate and civil litigation work.
- Does Mark Donald Law handle human rights complaints in Ontario?
- The firm has appeared before the Human Rights Tribunal of Ontario and has represented clients in human rights matters, including disputes involving school boards and other institutions.
- Where is Mark Donald Law located and how do I book a consultation?
- The office is at 3 Church Street, Suite 500, in downtown Toronto. Consultations can be requested by phone or through the contact page on the firm's website.
Where to find them
3 Church Street, Suite 500, Toronto, ON M5E 1M2 · 416-681-9615
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