Regulator may refer to:

• Regulator (automatic control), a device which has the function of maintaining a designated characteristic
• Battery regulator, a device in a battery pack which bleeds off excess charge current to let all cells reach full charge without overcharging some cells
• Diving regulator, which provides a scuba diver with breathing gas at ambient pressure from a diving cylinder
• Gas pressure regulator, a device that is attached to tanks of gases under high pressure oxygen, nitrogen, carbon dioxide, compressed air, propane, acetylene and other compressed gases to provide a workable low-pressure gas stream from which equipment or breathing apparatus can be safely operated
• Regulatory agency
• Voltage regulator, in electronics
• The regulator of a number field in algebraic number theory (see Dirichlet's unit theorem); a quantity defined from the group of units. After taking logarithms, it has the interpretation of the volume of a fundamental domain in the lattice of units in 'logarithmic space'
• The Regulator, the English name of the French Steampunk comic Le Régulateur as published in Heavy Metal
• Regulator, in physics, a construction used in regularization techniques—see regularization (physics)
• Regulator, in a steam locomotive, the lever and associated valve which controls the passage of steam from the boiler to the cylinders
• Regulator, a naval police officer in the United Kingdom, a member of the Royal Navy Regulating Branch
• Regulator, a precision pendulum clock used as a standard for regulating other timepieces or for timing astronomical observations

Regulators may refer to:-

• A regulatory agency, a body that establishes, monitors, reforms and enforces regulations. See for example competition regulator, economic regulator or Civil Aviation Authority
• Regulators Society, a secret society formed in 1853 at Norwich University, which has ties to theta Chi International Fraternity
• Regulate (song), a rap song by Warren G and Nate Dogg
• The Regulators, a novel written under Stephen King's pen name, Richard Bachman