Bernard Faÿ (3 April 1893, Paris – 31 December 1978, Tours) was a French historian of Franco-American relations, an anti-Masonic polemicist who believed in a worldwide Jewish-Freemason conspiracy, and, during World War II, a Vichy official.
Faÿ was a friend of Gertrude Stein, Alice B. Toklas and of the American composer Virgil Thomson, who owed to Faÿ his access to French intellectual circles, for Faÿ knew most of the people in musical and literary Paris. He was active in compiling files on and attacking and imprisoning Freemasons during the Vichy regime, 1940–44. He was convicted and sentenced to life in prison. He escaped after five years and resumed teaching history in Switzerland, in Fribourg, Ouchy and Lutry. M. Fäy taught European History, American History and Cultural History.