Walery Jan Slawek (Polish pronunciation: [va'l?r? 'jan 'swav?k] (listen); 2 November 1879 – 3 April 1939) was a Polish politician, freemason, military officer and activist, who in the early 1930s served three times as Prime Minister of Poland.
He was one of the closest aides of Polish leader, Józef Pilsudski.