Plutocracy (Greek: πλοῦτος, ploutos, 'wealth' + κράτος, kratos, 'rule') or plutarchy, is a form of oligarchy and defines a society ruled or controlled by the small minority of the wealthiest citizens. The first known use of the term was in 1652. Unlike systems such as democracy, capitalism, socialism or anarchism, plutocracy is not rooted in an established political philosophy. The concept of plutocracy may be advocated by the wealthy classes of a society in an indirect or surreptitious fashion, though the term itself is almost always used in a pejorative sense.

The term plutocracy is generally used to describe or warn against an undesirable condition. Throughout history, political thinkers such as Winston Churchill, 19th-century French sociologist and historian Alexis de Tocqueville, 19th-century Spanish monarchist Juan Donoso Cortés and today Noam Chomsky have condemned plutocrats for ignoring their social responsibilities, using their power to serve their own purposes and thereby increasing poverty and nurturing class conflict, corrupting societies with greed and hedonism.

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