Ion Dic-Dicescu (born Ion Dicescu; Russian: Ива́н О́сипович Дик; May 1893 – January 4, 1938) was a Romanian socialist journalist and officer and later Bolshevik activist who held command positions in the Red Army during the Russian Civil War. After the war, he held research positions in the economical domain at several Soviet universities and research institutes, before being executed on accusations of espionage during the Great Purge. His elder son, Iosif Dik, although losing both hands and an eye fighting in the Red Army during World War II, was a successful children's writer in the post-war Soviet Union.
Ion Dicescu was born in Bucharest, in the family of a house painter. Unable to enroll in a university due to material constraints, he followed instead the local Commercial School, also working as a public accountant in order to support himself. He joined the Social Democratic Party of Romania at 18, in the same period, also becoming a contributor to the party's magazine, România Muncitoare. There, he collaborated with several important figures of the Romanian socialist movement, such as Mihail Gh. Bujor, N. D. Cocea, Alecu Constantinescu or Dimitrie Marinescu, being promoted to assistant editor-in-chief in 1914. He also edited an atheist magazine, Raţiunea ("The Rationality"), where he addressed themes such as natural sciences, philosophy and sociology, also publishing fragments from Marx's Das Kapital and other European materialist philosophers.