Krzysztof Marek Piesiewicz (Polish pronunciation: ['k???t?f pj?'??vit??]; born 25 October 1945 in Warsaw, Poland) is a Polish lawyer, screenwriter, and politician.
From 1991 to 1993 and from 1997 to 2011 he was a member of Polish Senate.
He was the head of the Ruch Spoleczny (RS) or Social Movement Party.