The 8th Ersatz Division (8. Ersatz-Division) was a unit of the German Army, in World War I. The division was formed on mobilization of the German Army in August 1914. The division was a composite division, formed from 12 brigade replacement battalions (Brigade-Ersatz-Bataillone) from the Kingdom of Württemberg, the Grand Duchy of Hesse, the Rhine Province and the Province of Hesse-Nassau. It became more Württemberg as the war progressed and in February 1917 was officially designated a Royal Württemberg division. It was redesignated the 243rd Infantry Division in April 1917.