Falkenhausen / A (Army Detachment A) was an army level command of the German Army in World War I. It served on the left (southern) wing of the Western Front throughout its existence.
Falkenhausen was set up in the southern part of the Western Front in Alsace-Lorraine on 17 September 1914 from the parts of 6th Army that remained in Lorraine after it marched north to participate in the Race to the Sea. The Staff of the dissolved Ersatz Corps under General der Infanterie Ludwig von Falkenhausen took command. It was established as A on 15 April 1916. It was still in existence when the war ended, serving on the Western Front as part of Heeresgruppe Herzog Albrecht von Württemberg.
The following Orders of Battle illustrate the progression of the during the war.
By the end of the war, the majority of the units assigned were lower quality Reserve and Landwehr Divisions indicative of the relatively quiet sector that the was operating in.
A had the following commanders during its existence: