Constantin Dobrogeanu-Gherea (born Solomon Katz; 1855, village of Slavyanka near Yekaterinoslav (modern Dnipro), 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.