Stanislav Vikentyevich Kosior, sometimes spelled Kossior (Russian: Станисла́в Вике́нтьевич Косио́р, Ukrainian: Станіслав Вікентійович Косіор, Polish: Stanisław Kosior) (18 November [O.S. 6 November] 1889 – 26 February 1939) was one of three Kosior brothers, Polish-born Soviet politicians. He was General Secretary of the Ukrainian Communist Party, deputy prime minister of the USSR and member of the Politburo of the Communist Party of the Soviet Union (CPSU).