Regulator may refer to:
- Regulator (automatic control), a device that maintains a designated characteristic, as in:
- Battery regulator
- Pressure regulator
- Diving regulator
- Voltage regulator
- Regulator (economics), an agency established by central government for the control of or intervention in the operation of markets
- Regulator gene, a gene involved in controlling the expression of one or more other genes
- Regulatory agency or Regulator, an agency responsible for exercising autonomous authority over some area of human activity
- A precision pendulum clock, originally used as a time-standard for adjusting or regulating other clocks and watches
- An auxiliary physics concept used in regularization
- Regulator (mathematics), a positive real number used in Dirichlet's unit theorem
- A British term for a steam engine's throttle
- A component of Uilleann pipes, a form of bagpipes
- A flood control structure designed to manage the return of flood water from flood plains and diversion areas to the main channel
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