Sèvres, Treaty of, an agreement signed August 10, 1920, at Sèvres, France, by the victorious Allies of World War I and the defeated Ottoman (Turkish) Empire. The harsh provisions of the treaty, which called for surrendering parts of Turkey as well as giving up claims to all non-Turkish lands, were a factor leading to the overthrow of the government by Turkish nationalists. The nationalists under Mustafa Kemal refused to recognize the treaty. They drove Greek occupation forces from Turkish soil and succeeded in obtaining a treaty more favorable to Turkey, the treaty of Lausanne (1923).