The 77th Reserve Division was a unit of the Imperial German Army in World War I. The division was formed at the end of December 1914 and organized over the next month, arriving in the line in early February 1915. It was part of the second large wave of new divisions formed at the outset of World War I, which were numbered the 75th through 82nd Reserve Divisions. The division was initially part of XXXIX Reserve Corps. The division was disbanded in September 1918 and its assets were distributed to other units. When originally formed, the division had two reserve infantry regiments from the Province of Westphalia and one from the Rhine Province (257th). The two Westphalian regiments were replaced late in the war by the 332nd Infantry Regiment, a garrison regiment from Posen with two Rhineland battalions and one Posen battalion, and the 419th Infantry Regiment, a thoroughly mixed unit made of companies taken from different regiments.