Semyon Izrailevich Zapadny (real name Semyon Kesselman; Russian: Семён Израилевич Западный (Кессельман), 1899 – 1938) was a chekist, state security commissar of 3rd degree (general level rank), member of the NKVD special troikas, a chief of the Kiev Okruha GPU (KGB) in 1925-1928 and Khabarovsk Oblast in 1934–37. In 1919 he was one of the main chekists in Ukraine during the events of Russian Civil War. During the advance of the Armed Forces of South Russia, Zapadny served as a military intelligence officer in the 12th Army of the Southern Front.