The Don Army was the military of the short lived Don Republic and a part of the White movement in the Russian Civil War. It operated from 1918 to 1920, in the Don region and centered in the town of Novocherkassk.

The Don Republic, later known as the Almighty Don Host, was an independent self-proclaimed anti-Bolshevik republic formed by the Armed Forces of South Russia on the territory of Don Cossacks against another self-proclaimed Don Soviet Republic. The Don Republic existed during the Russian Civil War after the collapse of the Russian Empire from 1918 to 1920.