Understand your rights. Respond legally. Protect what matters.

When you or someone you love is threatened, instinct takes over. But even in high-stress moments, Canadian law requires that your response be justified, reasonable, and defensible in court. Our team at Neuberger & Partners LLP has decades of experience helping clients navigate the legal complexities of self-defence.

What is Self-Defence in Canada?

Self-defence in Canada is a legal justification, not an excuse. That means when it applies, it makes your actions lawful. The law recognizes that people have a right to respond to force or threats of force. There is no duty to retreat. However, the response must be reasonable in the circumstances.

Section 34 of the Criminal Code of Canada sets out three requirements that must all be met for self-defence or defence of another to apply:

1. A Reasonable Belief in a Threat

   You must believe, on reasonable grounds, that you or someone else was being threatened with force or was under attack

2. A Defensive Purpose

   Your actions must have been taken to protect, not to punish or retaliate.

3. A Reasonable Response

   The force used must be proportionate to the threat. Courts recognize that decisions in high-stress situations aren’t always perfect. The measure of force used does not have to have to measured to a nicety. This means that in the heat of the moment, a person is not expected to precisely calculate the exact amount of force needed, but excessive or vengeful force will not be protected under law. The law recognizes that people in dangerous situations cannot be expected to weigh every detail and act with perfect precision, focusing instead on the overall reasonableness of their actions.

What Factors Determine Whether the Force Was Reasonable?

Courts look at many elements, including:

• The nature and immediacy of the threat
• Whether weapons were involved
• The relative size, age, and strength of the parties
• Any history of violence or prior interactions
• Whether the accused could reasonably retreat from the situation
• The emotional state of the person acting in self-defence
• The use of excessive or unnecessary force

Importantly, you are not required to flee your own home. Canadian law does not demand retreat when defending yourself or others in your residence.

What if I Made a Mistake About the Threat?

Even if you were mistaken, such as believing someone was armed when they weren’t, you may still be protected under self-defence laws, provided your belief was reasonable given the circumstances.

This principle has been recognized in cases such as R. v. Cinous, 2002 SCC 29, where the Supreme Court confirmed that an accused may rely on self-defence even if mistaken, so long as the belief in danger was reasonable.

What About the Defence of Another Person?

Section 34 applies equally when defending someone else. Whether you stepped in to protect a loved one, a bystander, or even a stranger, the same three-part test applies: reasonable belief, defensive purpose, and reasonable response.