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.

The Armed Forces of South Russia (AFSR or SRAF) (Russian: Вооружённые силы Юга России, romanized: Vooruzhyonniye sily Yuga Rossii, VSYuR) were the unified military forces of the White movement in southern Russia between 1919 and 1920.