Katherine Marlea Clark (born July 17, 1963) is an American politician who has served as the United States Representative for Massachusetts's 5th congressional district since 2013. The district includes many of the northern and western suburbs of Boston, such as Medford, Framingham, Woburn and Clark's hometown of Melrose. She is a member of the Democratic Party. She was a member of the Massachusetts House of Representatives from 2008 to 2011, and a member of the Massachusetts Senate from 2011 to 2013.