Canadian Defamation Law: How Claims Work Province by Province

Canadian defamation law is mostly provincial, so the rules depend on where you live and where the statement was published. Across the common law provinces, you generally need to show that a statement about you was published to someone else and would lower your reputation in the eyes of a reasonable person. Quebec applies its civil law instead. In Ontario, strict notice rules apply to newspapers and broadcasts, and several provinces have anti-SLAPP laws that can end a weak claim early.

This guide explains the general principles and the practical steps that sit alongside a lawsuit. It is general information, not legal advice. Deadlines in Canadian defamation cases can be very short, so speak to a lawyer in your province who handles defamation as soon as you can.

Who makes the rules

Defamation falls under provincial jurisdiction in Canada. Each common law province and territory has its own statute, usually called a Libel and Slander Act or a Defamation Act, which sits on top of judge-made common law. Courts across the country draw on each other’s decisions and on rulings of the Supreme Court of Canada, so the core principles are broadly similar.

Quebec is different. It uses the Civil Code of Québec, where defamation is treated as a form of civil fault. A claimant generally has to show fault, injury and a causal link between them, which means the analysis often looks more at the conduct of the person who made the statement.

Because the statutes differ in details such as notice periods and limitation periods, the first question for any lawyer is which province’s law applies.

What a defamation claim needs

In the common law provinces, a claimant generally has to prove three things:

1. The words were defamatory, meaning they would tend to lower your reputation in the eyes of a reasonable person.
2. They referred to you, by name or in a way that people who know you would recognize.
3. They were published, meaning communicated to at least one person other than you.

Once these are shown, falsity and damage are generally presumed. The burden then shifts to the defendant to establish a defense. That is quite different from US law, where the person suing usually has to prove the statement was false and that the speaker was at fault. Our guide to defamation of character explains the US approach if you need to compare.

For online content, the Supreme Court of Canada has held that simply posting a hyperlink to defamatory material isn’t, on its own, publication of that material. Repeating or endorsing the content can be a different matter.

The main defenses

Defense	What it means in general terms
Justification (truth)	The defendant proves the statement was substantially true.
Fair comment	The statement was an opinion on a matter of public interest, based on facts, that a person could honestly hold, and it wasn’t made with malice.
Responsible communication	The statement was on a matter of public interest and the publisher acted responsibly in trying to verify it. The Supreme Court of Canada recognized this defense in 2009.
Absolute privilege	Statements in court proceedings and in Parliament or legislatures are protected.
Qualified privilege	Statements made in certain settings where there is a duty or interest in communicating, such as a reference or a complaint to the right authority, are protected unless made with malice.

Criticism of a business, including harsh reviews, often falls under fair comment if it reads as opinion and is based on real events. Our guide on defamation vs opinion covers where that line tends to sit.

Ontario’s notice rules

Ontario’s Libel and Slander Act contains some of the most important deadlines in Canadian defamation law. For libel in a newspaper or broadcast, a plaintiff must generally give the defendant written notice identifying the statement complained of within six weeks after the alleged libel came to the plaintiff’s knowledge. The action itself must generally be started within three months after the libel came to the plaintiff’s knowledge.

Missing the notice can defeat the claim. Ontario courts have considered whether online publications count as a “newspaper” or “broadcast” for these rules, and the answer has depended on the type of publication. That uncertainty is exactly why people in Ontario should get advice quickly rather than assume the general two-year limitation period applies.

Other provinces have their own notice and limitation provisions for media defendants, and they’re not identical. If a newspaper, broadcaster or news site is involved, treat the clock as already running.

Anti-SLAPP laws in Ontario, BC and Quebec

A SLAPP is a strategic lawsuit against public participation: a claim used to silence or intimidate someone speaking on a public issue. Three provinces have laws that let defendants ask the court to dismiss these claims early.

• Ontario added anti-SLAPP provisions to its Courts of Justice Act in 2015.
• British Columbia passed the Protection of Public Participation Act in 2019, modeled closely on Ontario’s approach.
• Quebec has provisions in its Code of Civil Procedure that allow courts to deal with abusive proceedings, including those aimed at limiting public debate.

In Ontario and BC, if a statement relates to a matter of public interest, the person suing must generally show the claim has substantial merit, that the defendant has no valid defense, and that the harm they’ve suffered is serious enough that the public interest in letting the case continue outweighs the public interest in protecting the speech. If a case is dismissed under these laws, the claimant may be ordered to pay the defendant’s legal costs.

This matters for anyone thinking of suing a critic, reviewer or journalist. A claim that looks like an attempt to shut down criticism can end quickly and expensively.

Suing for defamation in Canada: what it involves

1. Initial advice. A lawyer reviews the words, the context, where and when they were published, who read them, and which province’s law applies.
2. Notice and demand. Where a statutory notice is required, it goes out first. In other cases, a lawyer may send a letter asking for removal, a retraction or an apology.
3. Identifying an anonymous author. If you don’t know who posted the statement, a lawyer may ask the court to order a platform or internet provider to disclose identifying information. Courts weigh privacy and expression before making these orders.
4. The claim. A statement of claim is filed in the provincial superior court. The defendant may bring an anti-SLAPP motion early where one is available.
5. Outcome. Results can include damages, an injunction, removal of content, a retraction, settlement or dismissal. Many cases settle.

Litigation costs can be significant, and the losing side is often ordered to pay part of the winner’s costs. Canada has no broad statutory immunity for platforms like the US Section 230, but courts still look closely at whether a platform or intermediary was really a publisher of the words.

A worked example

This is an illustrative scenario, not a real client.

A bakery owner in Ottawa finds an article on a local news site saying health inspectors “shut her down twice for rodents.” The bakery has never been closed, and its inspection records are clean. Orders from two corporate clients stop that week.

She saves a copy of the article with the date she first saw it and gathers her inspection records. Because the story appeared on a news site, her lawyer treats the Ontario notice rule as potentially applying and sends written notice to the publisher within days, identifying the statement and asking for a correction and removal. The lawyer also notes that a court would likely see a food safety story as a matter of public interest, so any claim would need to be well supported to survive an anti-SLAPP motion.

The publisher checks the records, removes the article and runs a correction. The owner asks her regular customers to share their experience in genuine reviews and updates her website with her current inspection results.

Common mistakes

• Assuming there’s plenty of time. Ontario’s six-week notice and three-month deadline for media libel catch people out.
• Using US guidance. In Canada, falsity and damage are generally presumed once the basics are shown, and platforms have no Section 230 equivalent. The rules and strategy differ.
• Suing a critic over opinion. Fair comment and anti-SLAPP laws protect a lot of criticism, and a failed claim can cost you the other side’s legal fees.
• Replying publicly with accusations, which can make you a defendant too.
• Losing evidence. Save copies, links and dates before anything is edited or deleted.

Getting help

For legal advice, look for a lawyer who handles defamation or media law in your province. Most provincial law societies run a lawyer referral service; in Ontario, the Law Society Referral Service can put you in touch with a lawyer for a free initial consultation. Legal aid rarely covers defamation, but law school legal clinics and community legal clinics can sometimes point you in the right direction.

If the real problem is your personal information rather than a false statement, privacy law may fit better. In Ontario, the Information and Privacy Commissioner handles complaints about public bodies and health records.

For the reputational side, our crisis management service helps when a damaging story is spreading, and our content removal service works on legitimate routes such as platform policies and publisher corrections. If you want to ask a publisher to fix an error before any legal step, our guide on requesting a correction or retraction walks through it.

Frequently asked questions

Is defamation law the same across Canada?

No. Defamation is mainly provincial, so each province and territory has its own statute alongside the common law, and Quebec applies the Civil Code. The core principles are similar in the common law provinces, but deadlines and notice rules differ.

What is the deadline to sue for defamation in Ontario?

For newspaper and broadcast libel, Ontario’s Libel and Slander Act generally requires written notice within six weeks of learning of the statement and a claim within three months. For other statements, the general two-year limitation period usually applies. Talk to a lawyer quickly to confirm which applies to you.

Do I have to prove the statement was false in Canada?

Generally no. In the common law provinces, once you show the words were defamatory, referred to you and were published, falsity and damage are presumed. The defendant can then try to prove a defense such as truth, fair comment or responsible communication.

What is an anti-SLAPP motion?

It’s an early request to dismiss a lawsuit that targets speech on a matter of public interest. Ontario, British Columbia and Quebec have these laws. If the motion succeeds, the person who sued may have to pay the defendant’s costs.