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Regulator may refer to:

Technology

Regulator (automatic control), a device that maintains a designated characteristic, as in:
Regulator (sewer), a control device used in a combined sewer system
Regulator (timepiece), a device in mechanical timepieces attached to the balance spring for adjusting the rate of the balance wheel
Regulator precision pendulum clock, originally used as a time-standard for adjusting or regulating other clocks and watches
Regulator, the throttle of a steam engine
Regulator, a component of Uilleann pipes, a form of bagpipes

Regulator (mathematics), a positive real number used in Dirichlet's unit theorem
Regulator (biology), an animal that is able to maintain a constant internal environment
Regulator gene, a gene involved in controlling the expression of one or more other genes
Regulator, an auxiliary physics concept used in regularization

Regulator, a member of the Royal Navy Police, formerly the Royal Navy Regulating Branch
Regulator, a member of the Red Army traffic control units, mostly female
Regulators, a faction in the Regulator Movement (1765–1771) in Provincial North Carolina
Regulator, a member of the Shaysites, followers of Daniel Shays during Shays' Rebellion (1786)
Regulators, a faction in the Regulator–Moderator War (1839–1844)
Regulator, a vigilante organized in response to the Banditti of the Prairie (1835–1848)
Lincoln County Regulators, a deputized posse during the Lincoln County War (1878)
Regulatory agency, a governmental body which oversees a particular economic activity