Bogdan Michał Borusewicz (Polish pronunciation: [ˈbɔɡdan ˈmʲixaw bɔruˈsɛvʲitʂ]; born 11 January 1949) was the Marshal in the Polish Senate from 20 October 2005 to 11 November 2015. Borusewicz was a democratic opposition activist under the Communist regime, a member of the Polish parliament (Sejm) for three terms and first Senate Marshal to serve two terms in this office. He was the acting president of Poland for a few hours in 2010.