Chernihiv Oblast (Ukrainian: Чернігівська область, translit. Chernihivs’ka oblast’; also referred to as Chernihivshchyna - Ukrainian: Чернігівщина) is an oblast (province) of northern Ukraine. The administrative center of the oblast is the city of Chernihiv.

The total area of the province is around 31,900 km².

The oblast is bordered on the west by the Kiev Reservoir of the Dnieper River and Kiev Oblast, by the Sumy Oblast to the east, and the Poltava Oblast to the south. The northern border of the oblast is part of Ukraine's international border abutting Belarus's Homyel Voblast in the north-west and the Russian Bryansk Oblast in the north-east, respectively.

The oblast is bisected into northern and southern sections by the Desna River, which enters the Dnieper just north of the Kiev city limits.

The Chernihiv Oblast was created as part of the Ukrainian Soviet Socialist Republic on October 15, 1932.

The capital city of Chernihiv has known human settlement for over 2,000 years, according to archaeological excavations. The Chernihiv Oblast comprises a very important historical region, notable as early as the Kievan Rus' period, when the cities of Chernihiv and Novhorod-Siverskyi were frequently mentioned. The city of Chernihiv was the second most important Ukrainian city during the Rus' period of Ukrainian history, often serving as a major regional capital. Danylo of Chernihiv wrote of his pilgrimage to Jerusalem during this era. The numerous architectural monuments of the city bear witness to the invasions suffered, including those by the Tatars/Mongols, Lithuanians, Poles, Russians, and Nazis. On the territory of the region took place numerous tragic events such as Battle of Kruty, Tragedy of Kryukivka, and many others.

Chernihiv (Ukrainian: Чернігів Ukrainian pronunciation: [t͡ʃerˈɲiɦiu̯]) or Chernigov (Russian: Чернигов) is a historic city in northern Ukraine. It is the administrative center of the Chernihiv Oblast (province), as well as of the surrounding Chernihivskyi Raion (district) within the oblast. The estimated population of the city is around 299,000 (as of 2006).

Chernihiv was first mentioned in the Rus'-Byzantine Treaty (907) (as Черниговъ), but the time of establishment is not known. According to the items uncovered by archaeological excavations of a settlement which included artifacts from the Khazar Khaganate, it seems to have existed at least in the 9th century. Towards the end of the 10th century, the city probably had its own rulers. It was there that the Black Grave, one of the largest and earliest royal mounds in Eastern Europe, was excavated in the 19th century.

In the southern portion of the Kievan Rus' the city was the second by importance and wealth. From the early 11th century it was the seat of powerful Grand Principality of Chernigov, whose rulers at times vied for power with Kievan Grand Princes, and often overthrew them and took the primary seat in Kiev for themselves. The grand principality was the largest in Kievan Rus and included not only the Severian towns but even such remote regions as Murom, Ryazan and Tmutarakan. The golden age of Chernihiv, when the city population peaked at 25,000, lasted until 1239 when the city was sacked by the hordes of Batu Khan, which started a long period of relative obscurity.