Aleksander Błażej Prystor (Polish: [alɛˈksandɛr ˈprɨstɔr]; 2 January 1874 – 1941) was a Polish politician, activist, soldier and freemason, who served as 23rd Prime Minister of Poland from 1931 to 1933. He was a member of the Combat Organization of the Polish Socialist Party and in 1908 took part in the Bezdany raid. Between 1912 and 1917 he spent in Russian prisons before being released in 1917. In March 1917 he joined Polish Military Organisation. After independence, he became secretary in the Ministry of Labour and Social Welfare. He fought as a volunteer in the Polish–Soviet War of 1919–1920. He worked for a few ministries (Labour, Industry and Commerce). Between 1931 and 1933 he served as Prime Minister of Poland. After that, he became the Marshal of the Polish Senate 1935–1938.