The Province (Oblast) of the Don Cossack Host (Ukrainian: Донська область, Russian: Область Войска Донского, Oblast’ Voyska Donskogo) of Imperial Russia was the official name of the territory of Don Cossacks, coinciding approximately with the present Rostov Oblast of Russia. Its site of administration was Cherkassk, relocated later to Novocherkassk.

Область Войска Донского
Oblast' voyska Donskogo'
Донська область
Oblast of Russian Empire

Flag Coat of arms
Flag Coat of arms
Location of Don Host Oblast
Capital Novocherkassk
 •  Named 1786
 •  Dissolution 1920
Today part of  Ukraine

The province comprised the areas where the Don Cossack Host settled in the Russian Empire. From 1786 the territory was officially named the Lands of the Host of the Don (zemlya Voyska Donskogo), renamed Don Host Province in 1870.

During 1913, the oblast, with an area of about 165,000 km², had about 3.8 million inhabitants. Of these, 55% (2.1 million) were Cossacks in possession of all the land; the remaining 45% of the population being townsfolk and agricultural guest labourers from other parts of Russia.

This subdivision was abolished in 1920; from the major part of it the Don Oblast of the RSFSR was created, which was incorporated into the North Caucasus Krai in 1924.

Coordinates: 47°26′09″N 40°05′55″E / 47.4358°N 40.0986°E / 47.4358; 40.0986