Ratchet may refer to:
Device
- Ratchet (device), a mechanical device that allows movement in only one direction
- Ratchet, a tool also known as a socket wrench
- Ratchet (instrument), a type of music instrument
Film and television
- Ratchet (Transformers), a character in the franchise Transformers
- 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
Video games
- Ratchet (Ratchet & Clank), a video game character
- Ratchet: Deadlocked, a video game
Music
- "Ratchet" (song), by Bloc Party
- Ratchet (album), a 2015 album by Shamir
Other
- Ratchet option, a financial derivative also known as cliquet option
- Double Ratchet Algorithm, an algorithm for managing cryptographic keys
See also
- Nurse Ratched