Constantin Doncea (September 26, 1904 – November 4, 1973) was a Romanian communist activist and politician. A railway worker, he played an important part in the Grivița Strike of 1933. Subsequently, imprisoned, he escaped and ended up in Moscow. He then joined the International Brigades during the Spanish Civil War. After spending much of World War II in the Soviet Union, he returned to Romania, where he helped establish a Communist regime. Doncea held a series of posts under the new order, but in 1958 he was removed from the party after clashing with its leader Gheorghe Gheorghiu-Dej. In his later years, he was rehabilitated by the latter's successor, Nicolae Ceaușescu.