Polish Auxiliary Corps (Polish: Polski Korpus Posiłkowy) was the name of the Polish military formation in the Austro-Hungarian Army, based on the Polish Legions. It was created in the aftermath of the Oath crisis from the Legions on 20 September 1916 and existed until 19 February 1918. In addition, some other members of the Legions were drafted into the main Austro-Hungarian Army or the German Polnische Wehrmacht.