Mykola Makarovych Marchak (Ukrainian: Микола Макарович Марчак; 5 January 1904 - 23 September 1938) was a Ukrainian and Soviet politician, who was the acting Chairman of the Council of People's Commissars of the Ukrainian SSR (today's equivalent of prime-minister) from October 1937 to February 1938.He was a son of a peasant and a member of the RCP (b) since 1921.In 20 June 1938, Marchak was arrested and accused of belonging to an anti-Soviet Trotskyist organization.