Wilhelm Anton Souchon (; 2 June 1864 – 13 January 1946) was a German and Ottoman admiral in World War I who commanded the Kaiserliche Marine's Mediterranean squadron in the early days of the war. His initiative made him one of the most important influences on the entry of the Ottoman Empire into World War I. The Dardanelles were fortified with German assistance, the Bosporus was secured by the presence of Goeben, now named Yavuz Sultan Selim, and on 27 September the Straits were officially closed to all international shipping.