Armee-Abteilung Falkenhausen / Armee-Abteilung 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.

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Armee-Abteilung Falkenhausen Armee-Abteilung A Army Detachment A
Flag of the Staff of an Armee Oberkommando (1871–1918)
Active	17 September 1914 – post 11 November 1918
Country	German Empire
Type	Army
Engagements	World War I

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Armee-Abteilung 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 Armee-Abteilung A on 15 April 1916. It was still in existence when the war ended,^[1] serving on the Western Front as part of Heeresgruppe Herzog Albrecht von Württemberg.^[2]

Armee-Abteilung A had the following commanders during its existence:^[5]

• Armee-Abteilung or Army Detachment in the sense of "something detached from an Army". It is not under the command of an Army so is in itself a small Army.^[9]
• Armee-Gruppe or Army Group in the sense of a group within an Army and under its command, generally formed as a temporary measure for a specific task.
• Heeresgruppe or Army Group in the sense of a number of armies under a single commander.

• Ersatz Corps
• German Army order of battle, Western Front (1918)