Marek Borowski
 Marek Stefan Borowski (Polish pronunciation: [ˈmarɛk bɔˈrɔfskʲi]; born 4 January 1946 in Warsaw Poland) is a Polish left-wing politician. He led the Democratic Left Alliance (SLD) for a time and was Speaker of the Sejm (the lower more powerful house of Poland's parliament) from 2001 to 2004.From 2004 to January 2009 he was the leader and chairman of a new Polish left-wing party called Social Democracy of Poland (SdPl) formed from a break-away group of SLD.