Ratchet

Ratchet may refer to:

Devices

 * Ratchet (device), a mechanical device that allows movement in only one direction
 * Ratchet, metonymic name for a socket wrench incorporating a ratcheting device
 * Ratchet (instrument), a musical instrument and a warning device

Film and television

 * Ratchet (Robots), a character in the film Robots
 * Ratchet, a character in the Widget the World Watcher television series
 * Ratchet, a character in the Red Lantern Corps DC Comics series
 * Ratchet (Transformers), a character
 * Ratchet, a 1986 thriller film by John Johnson

Video games

 * Ratchet (Ratchet & Clank), a video game character
 * Ratchet: Deadlocked, a video game

Music

 * “Ratchet (song)” Millionaires (group) featuring Kreayshawn, 2012
 * "Ratchet" (Bloc Party song), 2013
 * Ratchet (Shamir album), 2015
 * Ratchet, another name for the RnBass genre

Other

 * Ratchet option, a financial derivative also known as cliquet option
 * Double Ratchet Algorithm, an algorithm for managing cryptographic keys
 * Ratchet (slang), a derogatory term
 * Ratchet Gearloose, a Disney character, paternal grandfather of Gyro Gearloose