Mark Stephen Critz (born January 5, 1962) is an American politician and former U.S. Representative for Pennsylvania's 12th congressional district, having served from a special election in May 2010 until January 2013. He is a member of the Democratic Party. The district during his tenure, which was located in the southwestern portion of the state, stretched from Johnstown to the southern suburbs of Pittsburgh. Critz was the Democratic nominee for the 2022 U.S. House of Representatives election for Pennsylvania's 13th congressional district via write-in, but he declined to run.