Marian Zyndram-Koscialkowski (Polish pronunciation: ['marjan 'z?ndram k??t??aw'k?fsk?i]; 16 March 1892, Pandelys, Kovno Governorate – 12 April 1946 near Woking) was a Polish politician, freemason and military officer who served as voivode of Bialystok Voivodeship in 1930-1934, Mayor of Warsaw in 1934 and 27th Prime Minister of Poland from 1935 to 1936.