The 4th Eastern Siberian Corps (Russian: 4-й Восточно-Сибирский корпус) was formed in September 1918.

On the orders of the Major General P. P. Ivanov-Rinov, the commander of the Siberian Army, on 17 September 1918, A. V. Ellerts-Usov, the commander of the Irkutsk military district, took over the corps.

The Corps was one of the main formations of the Siberian Army during the Russian Civil War.

It was planned to include the 3rd and 8th Siberian rifle divisions in the corps, with the territories of the Irkutsk province and the Trans-Baikal region (with the exception of its Cossack population) were allocated for manning.

Kolchak ordered the abolition of the corps areas of the Siberian Army and form military districts instead.