Valentin Feldman (23 June 1909 – 27 July 1942) was a French philosopher and Marxist of Jewish-Russian origin.
Among his friends were Jean-Paul Sartre, Simone de Beauvoir, Gaston Bachelard and Georges Politzer.
Mobilized as a soldier in Rethel, he began to write his Journal de guerre in January 1940 in the middle of the Phoney War.
After a year, he wrote the texts against the collaborationist Vichy regime and the Germans in the clandestine newspaper L'Avenir normand in Dieppe, and wrote several texts for the clandestine Parisian review La Pensée libre, supervised by Georges Politzer, Jacques Decour and Jacques Solomon.
Becoming part of the underground, he joined a group of communist Resistance in Rouen, where he participated in actions against the German occupiers.