Abstract In most cases, liability in tort law is all-or-nothing —a defendant is either fully liable or not at all liable for a claimant's loss. By contrast, this paper defends a causal theory of partial liability. I argue that a defendant should be held liable for a claimant's loss only to the degree to which the defendant's wrongdoing contributed to the causing of the loss. I ground this principle in a conception of tort law as a system of corrective justice and use it to critically evaluate different mechanisms for “limiting” liability for consequences of wrongdoing and for “apportioning” liability between multiple wrongdoers.