Leon Tadeusz Kozłowski (Polish pronunciation: [ˈlɛɔn kɔˈzwɔfskʲi] (listen); 6 June 1892 – 11 May 1944) was a Polish archaeologist, freemason and politician who served as Prime Minister of Poland from 1934 to 1935, before being convicted and sentenced to death for Treason during World War II.