Theodor Körner, Edler von Siegringen (German pronunciation: [ˈteːoˌdoːɐ̯ ˈkœʁnɐ] ; 23 April 1873 – 4 January 1957) was an Austrian military officer and statesman of the Socialist Party of Austria. He served as the president of Austria from 1951 to 1957 and as the mayor of Vienna from 1945 to 1951.