Reserve-Korps) was a corps level command of the German Army in World War I.

The Corps was formed in October 1914 as the temporary Corps Graudenz or Corps Zastrow[1] named for its commander General der Infanterie Ernst von Zastrow,[2] military governor of Graudenz.

On 21 July 1915 it was established as XVII Reserve Corps.

[3] The nucleus of the corps was troops collected at Graudenz Fortress.

In mid-November 1914 it consisted of two divisions: Wernitz and Breugel with a strength of 26 battalions, 6 squadrons and 13 batteries.