The doctrine of common purpose, common design, joint enterprise, or joint criminal enterprise is a  common law legal doctrine that imputes criminal liability to the participants in a criminal enterprise for all that results from that enterprise. A common application of the rule is to impute criminal liability for wounding a person to participants in a riot who knew, or were reckless as to knowing, that one of their number had a knife and might use it, despite the fact that the other participants did not have knives themselves.

Common Purpose is a British founded charity that runs leadership development programmes around the world.