Defamation Law: Know Your Defences and Protect Yourself

A defamation claim does not automatically succeed just because defamatory words were published about the plaintiff. Canadian defamation law provides defendants with a range of defences that, if established, can defeat the claim entirely. Some of these defences are straightforward denials that the basic elements of the tort were met. Others are specific to defamation and operate on shifting burdens of proof that make them both powerful and technically demanding.

This article provides a comprehensive overview of the defences available in a defamation action in Canada, with a focus on Ontario law. Understanding them matters both for defendants who need to know what protection the law offers and for plaintiffs who need to anticipate what they will be up against.

General Defences: Denial and Limitation Periods

Before reaching the special defamation defences, a defendant has access to general defences available in any civil action.

Denial

The first layer of defence is denial: challenging the basic elements the plaintiff must establish to make out the tort. A defendant may deny that they were the publisher of the alleged defamatory statement, deny that the words complained of were actually defamatory, deny that the words referred to the plaintiff, or deny that the words were communicated to any third party.

Each of these denials mirrors one of the three essential elements a plaintiff must prove: that the words were defamatory, that they referred to the plaintiff, and that they were published to at least one person other than the plaintiff. A successful denial on any one of them can dispose of the claim.

In the online context, where anonymous publishers are increasingly common, denying identity is a live issue. A plaintiff who suspects they know who is behind an anonymous post bears the burden of proving it. Where identity cannot be established with certainty, a Norwich Order may be sought to compel the platform or internet service provider to disclose the author’s identity before proceedings are commenced.

Limitation Periods and Notice Requirements

A defendant may also argue that the claim is statute-barred. Ontario’s general two-year limitation period applies to defamation claims. However, where the defamation appears in a newspaper or broadcast, the Libel and Slander Act imposes additional restrictions: the plaintiff must provide written notice of the alleged libel within a specified period before commencing an action, and the action itself must be brought within a shorter limitation window. Failure to comply with these requirements is a complete answer to the claim.

The Special Defences

Where the plaintiff establishes the basic elements of the tort and there is no issue about who published the words, the defendant must rely on the special defences specific to defamation. The burden shifts: it is for the defendant to establish each defence.

1. Truth (Justification)

Truth is a complete defence to a defamation claim. If what was said about the plaintiff was substantially true, there is no liability, regardless of the defendant’s motive or state of mind. Even a defendant who published the truth out of spite or malice will succeed on this defence. Conversely, the defendant’s honest belief in the truth of the statement provides no defence if the statement was in fact false.

The defendant is not required to prove every word of the publication to be true. The standard is substantial truth of the “sting” or main thrust of the allegation. Minor inaccuracies in detail will not defeat the defence if the core substance is proved. However, half-truths are not sufficient: a statement that is technically accurate but creates a false overall impression will not be justified by pointing to the accurate component.

One important rule applies where the defendant is accused of repeating a defamatory statement made by someone else. The defendant cannot justify by proving that another person said it. The “repetition rule” requires the defendant to prove the underlying statement is substantially true, not merely that they accurately reported what they heard. As the Supreme Court of Canada has noted, this rule is particularly important in the age of the internet, where defamatory material can spread between websites at speed.

In Ontario, section 22 of the Libel and Slander Act modifies the common law rule on partial justification, providing that the defence will not fail simply because the truth of every statement has not been proved, as long as the words not proved to be true do not materially injure the plaintiff’s reputation in light of those words that are proved true.

2. Absolute Privilege

Absolute privilege is a complete defence that applies even where the defamatory statement was made with malice. It represents a policy judgment that certain communications must be entirely free from the risk of defamation liability, no matter what was said or why. Its scope is narrow.

The most important context for absolute privilege is judicial and quasi-judicial proceedings. Statements made by judges, lawyers, parties, and witnesses in the course of court proceedings are absolutely protected. This extends to documents forming part of the proceedings, such as pleadings and affidavits, and to communications made before proceedings commence where the communication is directly concerned with proceedings then being contemplated. The rationale is that the integrity of the justice system requires all participants to be free to speak without the chilling effect of potential defamation liability.

Absolute privilege also applies to statements made by federal and provincial politicians in their legislative assemblies. A member of Parliament or a provincial legislature cannot be sued for defamation in respect of anything said in the House or Legislature. This privilege does not extend to municipal councillors, who are entitled only to qualified privilege for statements made in council meetings.

Communications between officers of state made in relation to state matters, in the course of their duties, also attract absolute privilege in appropriate circumstances.

3. Qualified Privilege

Qualified privilege is one of the most frequently invoked defamation defences in practice. It protects statements made on occasions where the defendant had a duty or legitimate interest, whether legal, social, or moral, in making the statement, and the recipient had a corresponding duty or interest in receiving it. Employment references, reports to regulatory or professional bodies, complaints to authorities, and internal communications within organizations are common examples.

Where this reciprocity of interest exists, the defendant’s good faith is presumed, and the defence will protect statements that are untrue, as long as they were not made with malice. This makes the qualified privilege defence genuinely powerful: it can shield a defamatory statement that was made in error, without the defendant having to prove the statement was true.

The occasions that attract qualified privilege are assessed objectively by the court. The defendant must establish both that the occasion was one to which the privilege applied and that the communication was made in furtherance of the interest or duty that grounds it. Determining whether the requisite reciprocity exists is often the central battleground in a qualified privilege dispute. Courts have found the defence available in a wide range of contexts: a complaint to a law society about a lawyer’s conduct, a report by an employer to police about suspected employee theft, a reference letter from a former employer, a report by a director to fellow shareholders, and a statement by a professional body to its members about a fellow member’s conduct. In each case, the key question is whether the speaker had a genuine duty or interest in communicating, and whether the recipient had a genuine duty or interest in receiving.

The privilege is, however, qualified, and it can be lost in two ways. First, the defendant must not have exceeded the scope of the privileged occasion. The privilege only protects what is relevant and pertinent to the duty or interest that grounds it: anything beyond that is not protected. Publishing the defamatory statement more widely than the occasion requires will defeat the defence. A complaint made to the appropriate regulatory body is one thing; posting the same allegations publicly on the internet to maximize the plaintiff’s embarrassment is another. The occasion determines the appropriate audience, and exceeding that audience takes the communication outside the protection of the privilege. Second, and most practically important, if the plaintiff can prove that the defendant’s dominant purpose was malice rather than the legitimate purpose that grounds the privilege, the defence fails regardless of whether the occasion would otherwise attract it.

From a defendant’s perspective, the risk of a qualified privilege defence being defeated on scope grounds is one of the most avoidable in defamation law. The discipline of communicating only to those with a legitimate need to know, using measured language, and sticking to what is relevant to the occasion significantly reduces the exposure. A defendant who goes further, copying people who have no genuine interest in the matter, using inflammatory language, or appending personal attacks to what might otherwise be a legitimate complaint, creates the conditions for the privilege to be stripped away.

4. Fair Comment

Fair comment protects statements of opinion on matters of public interest. It reflects the principle that robust criticism, commentary, and debate on public matters should not be suppressed by defamation law, even when the opinions expressed are extreme, prejudiced, or personally damaging.

To establish fair comment, the defendant must show that the statement: was on a matter of public interest; was based on true underlying facts; was recognizable as comment or opinion rather than a statement of fact; and reflects an opinion that any person could honestly hold on the basis of those facts. A comment need not be reasonable or moderate to qualify. As long as it represents a view that a person, however extreme their opinions, could honestly hold on the proved facts, the defence is available.

A statement that might look like comment when made in reference to known facts can lose that character if it is made without reference to any factual basis. Where comment is inextricably mixed with unverified facts, or where the words read as a factual assertion rather than a judgment, the defence may not be available.

Like qualified privilege, fair comment is defeated by proof that the defendant was actuated by malice. The burden of proving malice rests with the plaintiff. Malice in this context means an improper or ulterior motive, including publishing the statement dishonestly, in knowing disregard of its falsity, or with the dominant purpose of injuring the plaintiff rather than expressing a genuine opinion. We have written about the fair comment defence in detail in a separate post.

5. Responsible Communication on Matters of Public Interest

The defence of responsible communication was established by the Supreme Court of Canada in Grant v. Torstar Corp. and is primarily, though not exclusively, available to media defendants. It protects the publication of defamatory statements on matters of public interest where the publisher was responsible and diligent in verifying the allegation.

Two elements must be established. First, the publication must be on a matter of genuine public interest. Second, the publisher must have been diligent in attempting to verify the information, having regard to the seriousness of the allegation, its urgency, the reliability of the source, whether the plaintiff was given the opportunity to respond, and other relevant circumstances.

The practical core of this defence is often whether the plaintiff was contacted before publication and given the chance to provide their side of the story. Fairness and balance in the reporting process are central to whether the defence will succeed.

The defence also protects “reportage”: fair and neutral reporting of a dispute that is itself a matter of public interest, even if the report includes defamatory statements made by parties to the dispute. The key requirements for reportage are that the defamatory statement be attributed to an identified person, that the publisher indicate it has not verified the statement’s truth, that both sides of the dispute be fairly represented, and that the context be explained.

Responsible communication is defeated by malice. A defendant who publishes with an improper motive or in knowing disregard of the truth has, by definition, not acted responsibly.

6. Consent

The defence of consent is narrow and arises infrequently, but where it applies it provides a complete defence. A plaintiff who has consented to the publication of defamatory material cannot successfully sue for it.

Consent may be express, as where a participant in a television program signs a release acknowledging they may be portrayed in a disparaging manner. It may also be inferred from the plaintiff’s conduct. A plaintiff who publicly restates a defamatory accusation made against them, inviting further public discussion of it, may be found to have consented to its further publication. A blog host who discovers a defamatory post on their blog but leaves it up may be found to have consented to its continued presence.

The defendant must establish that the plaintiff had some reason to believe, when authorizing or inviting the publication, that it would include negative or unflattering content. The plaintiff does not need to have known the precise defamatory content in advance.

7. Innocent Dissemination

The innocent dissemination defence protects parties who distribute information without knowing it contains defamatory content and without having any reason to suspect that it does. It applies to intermediaries such as bookstores, libraries, news vendors, and internet service providers, who are not the authors of the material they distribute and who played no editorial role in its creation.

For the defence to succeed, the defendant must show they had no actual knowledge of the libel, were not put on notice of any circumstances suggesting a libel, and were not negligent in failing to discover it. Once a defendant is notified of allegedly defamatory content and given a reasonable opportunity to remove it, continued distribution will take them outside the protection of the defence.

This is the defence most directly at issue in the developing law on social media platform liability, where courts are actively examining whether and when platforms like Google lose innocent dissemination protection after receiving specific notice of defamatory content. We have addressed this in detail in our posts on Google review liability and platform responsibility for third-party content.

The Role of Malice

As noted throughout, malice defeats the defences of qualified privilege, fair comment, and responsible communication. It does not affect justification, absolute privilege, or consent. This asymmetry matters: a defendant who cannot establish truth cannot save the case by arguing they were acting in good faith, but a defendant who has established a privileged occasion can lose that protection if the plaintiff proves malice.

Malice in defamation law is not simply hostility or bad feelings toward the plaintiff. It includes those things, but it is broader. Malice exists where the defendant published the words dishonestly, or in knowing or reckless disregard for their truth. It also includes any indirect motive or ulterior purpose that conflicts with the duty or mutual interest that creates the privilege. A defendant who uses a privileged occasion primarily as a vehicle to damage the plaintiff rather than to discharge the duty or advance the interest that grounds the privilege has acted with malice, even if the defamatory statement happens to be true.

The burden of proving malice sits with the plaintiff, and it is a demanding one. The mere fact that the defendant felt negatively toward the plaintiff, or that the statement turned out to be false, is not sufficient. Courts look at the totality of the circumstances: the language used, the tone and manner of the communication, the relationship between the parties, the defendant’s stated reason for making the communication, and whether the occasion and the statement are in any genuine proportion to one another. A shareholder complaint made in measured language at an appropriate meeting is treated differently from a letter dripping with personal animosity sent to a wide distribution list that has no legitimate interest in the subject.

Evidence defendants can lead to resist a malice finding includes demonstrating that the words were spoken calmly, that the defendant had no prior grievance with the plaintiff, that there was a genuine reason for the communication that predated or was independent of any hostility, and that the defendant actually believed what they were saying. The last point matters particularly in the reckless disregard context: a defendant who took steps to verify the information before publishing it is in a different position from one who made no inquiries at all.

Because malice is assessed against the dominant purpose of the communication, a mixed-motive defendant can sometimes succeed. Where the defendant had both a legitimate purpose and some degree of hostility toward the plaintiff, the defence will survive if the legitimate purpose was dominant. Only where the improper motive is the primary driver does the privilege collapse.

Choosing the Right Defence

The appropriate defence or combination of defences depends entirely on the facts. A statement that is true needs no other defence. A statement made in court proceedings is absolutely protected. A statement made in the context of an employment reference may be protected by qualified privilege. An opinion piece on a public figure may attract fair comment. A news report on a matter of public interest may engage responsible communication.

Many defamation cases involve multiple defences pleaded in the alternative, and working out which combination gives the best prospect of success requires careful analysis of the specific facts, the nature of the publication, the context in which it was made, and the identity of the parties.

Conclusion

Canadian defamation law recognizes a sophisticated range of defences that reflect the competing values of reputation protection, free expression, and public interest in robust debate. Justification removes liability entirely where the truth is proved. Absolute privilege insulates certain communications from scrutiny regardless of their content. Qualified privilege, fair comment, and responsible communication protect good faith participation in important social functions, subject to the plaintiff’s ability to show malice. Consent and innocent dissemination address more specific circumstances in which a defendant’s involvement in the publication was either invited or entirely passive.

Understanding which defences apply, how to establish them, and what can defeat them is essential to navigating any defamation dispute. The defences are technically demanding and fact-specific, and getting the analysis right at the outset can mean the difference between a claim that succeeds and one that does not.