Kostyak Mykola Mykhailovych (born December 1, 1954, Michurine village, Donetsk Region) is a Ukrainian politician. He was Chief of Local State Administration and Governor of the Kherson Region from June 18, 2010 till February 24, 2014, and was a member and head of the regional organization of the Party of Regions.
Kostyak was born in Michurine village, Telmanivskiy Area in Donetsk Oblast, Ukraine. In 1971 he graduated from the Crimea Agricultural Institute. In 1972 he worked as a member of the kolkhoz named after Telman in Telmanivskiy Area. From 1973-1976 he was in the service of the Armed Forces Of the USSR. From 1981 to 1983 he worked as a hydraulic engineer, later as the main hydraulic engineer and as the main agronomist of the “Hammer and Sickle” kolkhoz in Telmanivskiy Area.
He was awarded the Order of Merit III class, as well as a title of the Honoured Worker of Agriculture of Ukraine.