In Canadian law, a duty of care is a legally recognised obligation requiring a person or entity to conform to a particular standard of conduct in order to avoid causing foreseeable harm to others. It is a foundational element of the law of negligence and operates as a threshold inquiry. Without a duty of care, no liability in negligence can arise, regardless of the seriousness of the harm suffered. The duty of care reflects a balance between individual autonomy and social responsibility. It answers the normative question of whether, and in what circumstances, the law should require one party to be mindful of the interests of another.

Constitutional Foundation in Canadian Law

The modern Canadian approach to duty of care is grounded in the common law and has been shaped primarily by judicial decisions. The Supreme Court of Canada has developed a principled framework that moves away from rigid categories while still recognising established duties in recurring relationships. Although statutory provisions may create specific duties in regulated contexts, the general duty of care in negligence is a common law concept of enduring application across Canada, subject to provincial jurisdiction over property and civil rights.

The Governing Test for Duty of Care

Canadian courts determine the existence of a duty of care using the two-stage Anns/Cooper framework, as affirmed in Cooper v Hobart and subsequent cases. 

Stage One: Foreseeability and Proximity

At the first stage, the claimant must establish:

• Reasonable foreseeability: that a reasonable person in the defendant’s position would have foreseen that their conduct could cause harm to the claimant; and
• Proximity: a close and direct relationship between the parties such that it is just and fair to impose a duty.

Proximity is assessed by examining factors such as expectations, representations, reliance, statutory context, and the nature of the relationship. Some relationships, such as doctor and patient, lawyer and client, occupier and lawful visitor, are recognised as inherently proximate.

If foreseeability and proximity are established, a prima facie duty of care arises.

Stage Two: Residual Policy Considerations

At the second stage, the court considers whether broader policy reasons should negate or limit the duty. These include concerns about indeterminate liability, interference with legitimate policy-making functions, or adverse effects on socially desirable activities. These considerations must be external to the relationship between the parties.

Established and Novel Duties of Care

Canadian law recognises two broad categories:

• Established duties of care, arising in well-settled relationships, where courts do not reopen the proximity analysis.
• Novel duties of care, where the relationship does not fall within an established category and requires a full Anns/Cooper

This approach ensures both stability and adaptability in the law. 

Scope and Content of the Duty

The existence of a duty of care is distinct from its scope. Once a duty is recognised, the law must determine:

• the standard of care required;
• the risks against which protection is owed; and
• the class of persons to whom the duty is owed.

The standard of care is generally that of a reasonable person in similar circumstances, adjusted where the defendant holds themselves out as possessing specialised skill or expertise.

Classifications of Duty of Care

Duties of care may be classified by context, including:

• Personal duties, arising from direct interactions between individuals;
• Professional duties, owed by those exercising specialised knowledge or skill;
• Occupiers’ duties, owed by those who control premises;
• Public authority duties, subject to careful limits where policy discretion is involved.

Each classification carries distinct implications for proximity, standard of care, and policy analysis. 

Legal Implications and Consequences

A finding that a duty of care exists exposes the defendant to potential liability if the duty is breached and causes compensable harm. Conversely, the absence of a duty of care ends the negligence inquiry entirely. In some contexts, recognition of a duty of care may also influence contractual obligations, fiduciary duties, and regulatory compliance, though these remain legally distinct concepts.

Rights and Obligations

The duty of care imposes a correlative structure of rights and obligations:

• The claimant acquires a legally protected interest against unreasonable risk of harm.
• The defendant is obligated to take reasonable steps to avoid foreseeable injury within the scope of the relationship.

The duty does not require perfection or guarantee safety. It requires reasonable care, not absolute protection. 

Conclusion
In practical terms, duty of care shapes risk management, professional practice, and institutional decision-making. Individuals and organisations must assess how their actions may affect others with whom they have legally proximate relationships. Failure to do so may result in civil liability, reputational harm, and, in some cases, secondary regulatory or contractual consequences. In Canadian law, duty of care functions as the principled gateway to negligence liability, ensuring that responsibility for harm is imposed only where it is fair, foreseeable, and consistent with broader societal values.