A punitive expedition is a military journey undertaken to punish a political entity or any group of people outside the borders of the punishing state or union. It is usually undertaken in response to perceived disobedient or morally wrong behavior by miscreants, as revenge or corrective action, or to apply strong diplomatic pressure without a formal declaration of war (e.g. surgical strike). In the 19th century, punitive expeditions were used more commonly as pretexts for colonial adventures that resulted in annexations, regime changes or changes in policies of the affected state to favour one or more colonial powers.

Stowell (1921) provides the following definition:

When the territorial sovereign is too weak or is unwilling to enforce respect for international law, a state which is wronged may find it necessary to invade the territory and to chastise the individuals who violate its rights and threaten its security.