Ralph Winston Fox (30 March 1900 – 28 December 1936) was a British revolutionary, journalist, novelist, and historian, best remembered as a biographer of Lenin and Genghis Khan.

Fox was one of the best-known members of the Communist Party of Great Britain (CPGB) to be killed in Spain fighting against the Nationalists in the Spanish Civil War.

[5] In 1919 Fox became active in the effort to halt British blockade and military intervention to overthrow the Bolshevik government which had assumed power in the Russian Revolution of 1917.

[4] In 1920 as the dust was settling from the Russian Civil War, Fox travelled to Soviet Russia, an experience which further moved him towards lifelong identification with the communist political movement.

[4] During his time with the Marx-Engels Institute, Fox began a detailed study of the Asiatic Mode of Production as reflected in the writings of Karl Marx.

He published an article on the topic, "The Views of Marx and Engels on the Asiatic Mode of Production and Their Sources," in the journal Letopisi marksizma in 1930.

[5] In 1936, to fight fascism in the Spanish Civil War, Fox joined the International Brigades through the French Communist Party in Paris.