The 35th Reserve Division (35. Reserve-Division) was a unit of the Imperial German Army in World War I. The division was formed on the mobilization of the German Army in August 1914. The division was disbanded during the demobilization of the German Army after World War I. The division began the war as part of the central reserve of Fortress Thorn (Hauptreserve/Festung Thorn). Although designated a reserve division, initially, it was primarily composed of Landwehr units. In 1916, it was completely reorganized, receiving new brigade headquarters and newly formed regiments.