The Rationalist Union (French: Union rationaliste) is a French nonprofit organization founded in 1930 that promotes the role of reason. Many of the members are scientists, members of the Institut de France, Nobel Prize laureates, professors at the Collège de France, and famous writers.

Rationalist Union
Union rationaliste
Formation1930; 94 years ago (1930)
FounderPaul Langevin
Typenonprofit organization
PurposeThe promotion of reason
Location
Official language
French
President
Édouard Brézin
AffiliationsEuropean Humanist Federation
Websiteunion-rationaliste.org

The Union is strongly Republican (in the French sense of the term) and Jacobin and is opposed to communitarianism.

The Rationalist Union hosts two radio shows, one on the radio of the French Anarchist Federation, and another on the public radio France Culture, and publishes two journals, Les Cahiers Rationalistes, and Raison Présente.

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