The Vellore mutiny, or Vellore Revolution, occurred on 10 July 1806 and was the first instance of a large-scale and violent mutiny by Indian sepoys against the East India Company, predating the Indian Rebellion of 1857 by half a century. The revolt, which took place in the Indian city of Vellore, lasted one full day, during which mutineers seized the Vellore Fort and killed or wounded 200 British troops. The mutiny was subdued by cavalry and artillery from Arcot. Total deaths amongst the mutineers were approximately 350; with summary executions of about 100 during the suppression of the outbreak, followed by the formal court-martial of smaller numbers.

Mutiny is a revolt among a group of people to oppose, change, or remove superiors or their orders. The term is commonly used for insubordination by members of the military against an officer or superior, 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 subordinates defy superiors.