The Assistant Secretary of the Army (Civil Works), abbreviated ASA(CW), is an office of the United States Department of the Army responsible for overseeing the civil functions of the United States Army. The Assistant Secretary of the Army (Civil Works) reports to the United States Under Secretary of the Army, who in turn reports to the United States Secretary of the Army

The United States under secretary of the Army is the second-highest-ranking civilian official of the United States Department of the Army, serving directly under the United States Secretary of the Army. The Secretary and Under Secretary, together with two military officers, the Chief of Staff of the United States Army and the Vice Chief of Staff of the United States Army, constitute the senior leaders of the United States Army.