Ratchet may refer to:
Devices Ratchet (device), a mechanical device that allows movement in only one direction Ratchet effect in sociology and economics 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
See also Nurse Ratched Ratched (TV series)