Reserve-Korps / IV RK) was a corps level command of the German Army in World War I. IV Reserve Corps was formed on the outbreak of the war in August 1914[1] as part of the mobilisation of the Army.

It was initially commanded by General der Artillerie Hans von Gronau, who was recalled from retirement.

[3] The Corps was still in existence at the end of the war[4] as part of the 2nd Army, Heeresgruppe Kronprinz Rupprecht on the Western Front.

22nd Reserve Division was formed by units drawn from the XI Corps District.

[11] On mobilisation, IV Reserve Corps was assigned to the 1st Army, which was on the right wing of the forces that invaded France and Belgium as part of the Schlieffen Plan offensive in August 1914.