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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Family Law & Divorce Ontario » Suing an Ex-Spouse for Defamation During an Ontario Divorce

Suing an Ex-Spouse for Defamation During an Ontario Divorce

22 Jul 2026 4 min read No comments Family Law & Divorce Ontario
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During an Ontario divorce, if an ex-spouse maliciously posts false allegations of fraud or criminal behaviour online to damage your career, you can sue them for the civil tort of defamation. You will need to file a Statement of Claim at the Superior Court of Justice, paying a basic filing fee of $243 CAD, within the strict two-year limitation period.

Going through a divorce is one of the most emotional experiences a person can endure. Unfortunately, in the heat of a contentious separation, some individuals resort to public smear campaigns to ruin their ex-partner’s personal and professional reputation. 📍 Whether you live in Hamilton, London, or Toronto, the legal principles protecting your reputation remain robust across Ontario.

When an ex-spouse spreads false statements claiming you committed an indictable offence or engaged in financial fraud, they cross the line from a private family dispute into a civil wrong. This is known as defamation, and the courts in Ontario take these matters seriously, allowing victims to seek financial damages for the harm caused to their reputation and livelihood.

Step-by-Step Process in Ontario

Pursuing a defamation lawsuit against an ex-spouse is entirely separate from resolving your spousal support or parenting time arrangements. It requires navigating civil litigation procedures. Most applicants in this province choose to hire a dedicated civil litigation lawyer, as the burden of proof rests firmly on the person whose reputation was harmed.

Step 1: Preserving the Evidence

The internet moves quickly, and defamatory social media posts can be deleted in seconds. Your very first step is to secure undeniable proof. Take clear screenshots of the harmful posts, ensuring that dates, timestamps, and the identity of the person posting are visible. If the defamation was spoken, gather written statements or contact information from witnesses who heard the falsehoods.

Step 2: Sending a Cease and Desist Letter

Before launching a formal lawsuit, a law firm will typically draft and serve a Cease and Desist letter to your ex-spouse. This legal document formally warns them to immediately stop making defamatory statements, remove any existing posts, and issue a public apology. 📄 Sometimes, the threat of civil litigation is enough to stop the malicious behaviour without needing to go to court.

Step 3: Drafting the Statement of Claim

If the ex-spouse refuses to stop or the damage to your career is already severe, your lawyer will draft a Statement of Claim. This comprehensive document outlines exactly what was said, how it is entirely false, and how it has financially or emotionally damaged you. It will also specify the exact amount of monetary damages you are seeking.

Step 4: Filing at the Superior Court of Justice

The Statement of Claim must be formally filed at your local branch of the Ontario Superior Court of Justice. At this stage, the court will stamp your documents and assign a file number. This officially commences your civil action for defamation.

Step 5: Serving the Ex-Spouse

Once filed, the documents must be personally served to your ex-spouse. They will then have 20 days to file a Statement of Defence if they reside in Ontario. If they attempt to argue that their statements were true (the defence of justification), they will have to prove those allegations in court.

How Much Does it Cost in Ontario?

Civil litigation can be a significant financial investment. When suing an ex-spouse for defamation, you should prepare for the following expenses:

  • Court Filing Fees: Issuing a Statement of Claim at the Superior Court of Justice currently costs $243 CAD. Filing additional motions or trial records will incur extra court fees.
  • Law Firm Fees: Civil litigation lawyers generally charge between $350 and $700 CAD per hour. A full defamation trial can cost tens of thousands of dollars in legal fees.
  • Process Server Fees: Hiring a professional to formally serve the legal documents to your ex-spouse usually costs between $100 and $250 CAD.

How Long Does the Process Take?

Timing is critical in civil lawsuits. ⏱ In Ontario, you are bound by a strict limitation period: you must generally file your claim within two years from the day you discovered the defamatory statements. However, if the defamation was published in a newspaper or broadcast on television or radio in Ontario, the Libel and Slander Act drastically shortens these timelines: you must serve a written notice of complaint within six weeks of discovering the libel, and you must formally file your Statement of Claim in court within just three months of when you became aware of it. The entire court process, from filing the claim to a final trial, often takes 18 months to 3 years due to court backlogs.

LibelDefamatory statements that are written or permanently recorded (e.g., Facebook posts, emails, published articles).
SlanderDefamatory statements that are spoken verbally and are temporary in nature (e.g., gossiping at a community centre, shouting accusations in public).

Frequently Asked Questions (FAQ)

Will defamation affect my parenting time or decision-making responsibility?

It can. While defamation is a civil issue, an ex-spouse maliciously spreading lies about you can demonstrate poor judgment and an inability to co-parent effectively, which a family court judge may consider when determining decision-making responsibility.

What if my ex-spouse only told the truth?

Truth is an absolute defence to defamation in Canada. If your ex-spouse can prove that their statements are factually accurate, your defamation claim will likely fail, regardless of how damaging the statements are to your reputation.

Can I get an injunction to stop them from posting?

Yes. In severe cases where ongoing false statements are causing irreparable harm to your business or career, a lawyer can seek an interlocutory injunction from the court to legally gag the ex-spouse until the trial concludes.

Do I have to prove financial loss to win?

For libel (written defamation), damages are generally presumed because the written word leaves a permanent stain on your reputation. However, proving specific financial losses (like losing a job contract) can significantly increase the compensation awarded.

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