Sumy is a city in northeastern Ukraine. It serves as the administrative center of Sumy Oblast. The city is situated on the banks of the Psel River with a population of 256,474, making it the 23rd-largest in the country.

Sumy Oblast, also known as Sumshchyna (Сумщина), is an oblast (province) in northeast Ukraine. The oblast was created in its most recent form, from the merging of raions from Kharkiv Oblast, Chernihiv Oblast, and Poltava Oblast in 1939 by the Presidium of the Supreme Soviet of the Soviet Union.