Constantin Dobrogeanu-Gherea (born Solomon Katz; 1855, near Yekaterinoslav (modern Dnipropetrovsk), then in Imperial Russia – 1920, Bucharest) was a Romanian Marxist theorist, politician, sociologist, literary critic, and journalist. He was also an entrepreneur in the city of Ploiești. Constantin Dobrogeanu-Gherea was the father of communist activist Alexandru Dobrogeanu-Gherea and of philosopher Ionel Gherea.
Constantin Dobrogeanu-Gherea was born in Yekaterinoslav Governorate of the Russian Empire to Ukrainian Jewish Katz family. After studies at Kharkiv University (where he engaged in revolutionary politics), Dobrogeanu-Gherea fled persecution by the Okhrana and settled in Iași (1875). He was active in socialist politics, giving shape to the first centers of activism in Romania, and contributed to left-wing magazines such as Contemporanul.
The group centered on Dobrogeanu-Gherea became the most preeminent one to form the Romanian Social-Democratic Workers' Party. At the same time, he introduced Narodist ideas to Romania, which were to have a crucial contribution to the emergence of Poporanism (although his group and the Poporanists became political adversaries after the latter joined the National Liberal Party and began using anti-Semitic slogans).