Mykola Makarovych Marchak (Ukrainian: ?????? ????????? ??????; 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.
On 20 June 1938, Marchak was arrested and accused of belonging to an anti-Soviet Trotskyist organization.
On 23 September 1938, Marchak was found guilty by the Military Collegium of the Supreme Court of the USSR and was sentenced to death.
Marchak was rehabilitated by the resolution of the Military Collegium of the Supreme Court of the USSR of 17 June 1958.