The U.S.–Austrian Peace Treaty is a peace treaty between the United States and Austria, signed in Vienna on August 24, 1921, in the aftermath of the First World War. This separate peace treaty was required because the United States Senate refused to advise and consent to the ratification of the multilateral Treaty of Saint-Germain-en-Laye of 1919.
Ratifications were exchanged in Vienna on November 8, 1921, and the treaty became effective on the same day. The treaty was registered in League of Nations Treaty Series on November 22, 1921.