Reserve-Korps / XXXX RK) was a corps level command of the German Army in World War I. XXXX Reserve Corps was formed in December 1914.

The personnel was predominantly made up of kriegsfreiwillige (wartime volunteers) who did not wait to be called up.

[3] It was still in existence at the end of the war[4] in the 6th Army, Heeresgruppe Kronprinz Rupprecht on the Western Front.

[5] On formation in December 1914, XXXX Reserve Corps consisted of two divisions.

[6] but was weaker than an Active Corps In summary, XXXX Reserve Corps mobilised with 18 infantry battalions, 2 cavalry detachments, 24 field artillery batteries (96 guns), 2 cyclist companies and 2 pioneer companies.