Causation is a common concern in common law and in civil law in the area of the tort of negligence (common law) and extra-contractual personal liability (civil law) in Canada. The present study undertakes a comparative analysis of this concept and identifies the similarities, differences and level of convergence of the rules governing it. Even if there are approximations to be made regarding the applicable rules governing causation in common law and in civil law, differences do not lack. The convergence of applicable rules is only present in part in this area.