Hadiach, sometimes spelled Hadyach, Gadyach, Gadiach, Haditch, or Hadziacz, is a city in Myrhorod Raion, Poltava Oblast (province) in the central-east part of Ukraine. It hosts the administration of Hadiach urban hromada, one of the hromadas of Ukraine. Hadiach is located on the Psel River. Population: 22,851.

Poltava Oblast, also referred to as Poltavshchyna, is an oblast (province) of central Ukraine. The administrative center of the oblast is the city of Poltava. Most of its territory was part of the southern regions of the Cossack Hetmanate. Population: 1,352,283.