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.
Born in Connecticut, Clark worked as an attorney in several states before moving to Massachusetts in 1995, where she worked in state government. She joined the Melrose School Committee in 2002, becoming committee chair in 2005. She was first elected to the state legislature in 2008 and contributed to legislation regarding criminal justice, education, and municipal pensions. She won the 2013 special election for the U.S. House of Representatives to succeed Ed Markey in the 5th district and sits on the House Appropriations Committee. She serves as Vice Chair of the House Democratic Caucus, the sixth-ranking post in the Democratic House leadership behind the Speaker.