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Lock may refer to:
- Lock (device), a mechanical device used to secure possessions
- Lock of hair, a tuft or small bundle of hair
- Lock (water transport), a device for boats to transit between different levels of water
- Lock (weapons guidance), missile navigation system's target acquisition fix
- Lock (firearm), the ignition mechanism of small arms
- Lock (rugby league), a player position in rugby league
- Lock (rugby union), a player position in rugby union
- Fermentation lock, a device in beer and wine making that allows carbon dioxide to escape while not allowing air to enter
- Lock, a number of grappling holds in wrestling, judo and other martial arts, e.g. armlock, leglock
- Rope lock, a device used in theater fly systems
- Lock (Waltz), a dance figure
- File locking, describes a mechanism that restricts access to a computer file
- Lock (computer science), a bookkeeping object used to serialize concurrent access
- Lock (database), a feature used when multiple users access a database concurrently
- SIM lock, a restriction on mobile phones to work only in certain countries or with certain providers
- Lock, South Australia, a small town in the centre of the Eyre Peninsula
- Lock Island (disambiguation), several islands
- Lock (surname)
- Ormer Locklear (1891–1920), American stunt pilot and film actor nicknamed "Lock"
- Lock Martin (1916–1959), stage name of American actor Joseph Lockard Martin, Jr., best known for playing the robot Gort in the film The Day the Earth Stood Still
- Lock (Saga of the Skolian Empire), a fictional sentient machine in the novels by Catherine Asaro
- All pages beginning with "Lock"
- All pages with titles containing "Lock"
- -lock, an Old English suffix
- Loch, a Gaelic term used in Scotland to describe lakes and other bodies of water
- Locke (disambiguation), a common English surname and place name
- Locker (disambiguation)
- Locking (disambiguation)
- Lox, cured salmon filet
- Unlock (disambiguation)
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