The 8th Army was an army level command of the German Army in World War I. It was formed on mobilization in August 1914 from the I Army Inspectorate. The army was dissolved on 29 September 1915, but reformed on 30 December 1915. It was finally disbanded in 1919 during demobilization after the war.

The Imperial German Army (1871–1919), officially referred to as the German Army, was the unified ground and air force of the German Empire. It was established in 1871 with the political unification of Germany under the leadership of Prussia, and was dissolved in 1919, after the defeat of the German Empire in World War I (1914–1918). In the Federal Republic of Germany, the term Deutsches Heer refers to the German Army, the land component of the Bundeswehr.