François Marie Charles Fourier (;French: [ʃaʁl fuʁje]; 7 April 1772 – 10 October 1837) was a French philosopher, an influential early socialist thinker and one of the founders of utopian socialism. Some of Fourier's social and moral views, held to be radical in his lifetime, have become mainstream thinking in modern society. For instance, Fourier is credited with having originated the word feminism in 1837.

Fourier's social views and proposals inspired a whole movement of intentional communities. Among them in the United States were the community of Utopia, Ohio; La Reunion near present-day Dallas, Texas; Lake Zurich, Illinois; the North American Phalanx in Red Bank, New Jersey; Brook Farm in West Roxbury, Massachusetts; the Community Place and Sodus Bay Phalanx in New York State; Silkville, Kansas, and several others. In Guise, France, he influenced the Familistery of Guise. Fourier later inspired a diverse array of revolutionary thinkers and writers.