Kenneth Ray Plum (born November 3, 1941) is an American politician and Democratic member of the Virginia House of Delegates, representing the 36th District since 1982. He earlier served from 1978 through 1980. His district includes a large part of Fairfax County, including the entirety of Reston. Plum was selected as chair of the House Democratic caucus on January 14, 2009. He was previously a chair of the Democratic Party of Virginia. He currently serves as Caucus Chair Emeritus. He also serves as the Chair of the Agriculture, Chesapeake and Natural Resources Committee.