Kidnapping or abduction is the unlawful abduction and confinement of a person against their will, and is a crime in many jurisdictions. Kidnapping may be accomplished by use of force or fear, or a victim may be enticed into confinement by fraud or deception. Kidnapping is distinguished from false imprisonment by the intentional movement of the victim to a different location.

Kidnapping may be done to demand a ransom in exchange for releasing the victim, or for other illegal purposes. Kidnapping can be accompanied by bodily injury, which in some jurisdictions elevates the crime to aggravated kidnapping.

Kidnapping of a child may be a distinct crime, depending on jurisdiction.

Kidnapping can occur for a variety of reasons, with motivations for the crime varying particularly based on the perpetrator.

The kidnapping of a person, most often an adult, for ransom is a common motivation behind kidnapping. This method is primarily utilized by larger organizations, such as criminal gangs, terrorist organizations, or insurgent groups. Typically this is done for financial incentive, with sums of money varying depending on the victim or the method of kidnapping.

Mexican gangs are estimated to have made up to $250 million in kidnappings from Central American migrants.

According to a 2022 study by political scientist Danielle Gilbert, armed groups in Colombia engage in ransom kidnappings as a way to maintain the armed groups' local systems of taxation. The groups resort to ransom kidnappings to punish tax evasion and incentivize inhabitants not to shirk. A 2024 study argued that insurgent groups are more likely to engage in kidnappings "under two conditions: to generate support and reinstate bargaining capacity when organizations suffer military losses on the battlefield and to enforce loyalties and display strength when organizations face violent competition from other non-state actors."

Kidnapping has been identified as one source by which terrorist organizations have been known to obtain funding.