Ludovico Geymonat (11 May 1908 – 29 November 1991) was an Italian mathematician, philosopher and historian of science.
Born in Turin, where Geymonat attended Liceo classico Cavour, he graduated in Philosophy in 1930 and in Mathematics in 1932.
Geymonat tried to break the wall between science and philosophy that characterised the idealistic culture fostered by Fascist intellectuals like Giovanni Gentile.
After the war, he became a communist assessor in Milan, between 1946 and 1949, when he obtained a chair of Theoretical philosophy at the University of Cagliari.
Member of the Italian Communist Party (PCI), later he was a supporter of the Communist Refoundation Party founded when PCI turned into the Partito Democratico della Sinistra.