Mutiny is a revolt among a group of people (typically of a military, of a crew or of a crew of pirates) to oppose, change, or overthrow an organization to which they were previously loyal. The term is commonly used for a rebellion among members of the military against an internal force, but it can also sometimes mean any type of rebellion against any force. Mutiny does not necessarily need to refer to a military force and can describe a political, economic, or power structure in which there is a change of power.

During the Age of Discovery, mutiny particularly meant open rebellion against a ship's captain. This occurred, for example, during Ferdinand Magellan's journeys around the world, resulting in the killing of one mutineer, the execution of another, and the marooning of others; on Henry Hudson's Discovery, resulting in Hudson and others being set adrift in a boat; and the notorious mutiny on the Bounty.