Lock may refer to:

• Lock (device), a mechanical device used to fasten a door for example
• Lock (firearm), the ignition mechanism used on early projectile weapons
• Canal lock, an enclosure in a canal used to raise or lower the water level for ships passing through
• Lock (computer science), a bookkeeping object associated with a piece of data that is used to serialize concurrent access
• Lock (Saga of the Skolian empire), a sentient machine in the novels by Catherine Asaro
• Goldilocks, and the three bears
• A tuft or small bundle of hair
• A grappling hold, such as a head lock
• One of the rugby union positions or rugby league positions
• Lock (telemetry), when the output data and clock signals match those of an input signal transmitted and sent through a bit synchronizer, a device that establishes a series of clock pulses which are synchronous to the incoming signal
• Lock (spacecraft), a positional fix on another object, or it can mean lock on telemetry data

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