Keith Langseth (born January 20, 1938) is a Democratic Farmer Labor Party politician and former member of the Minnesota Senate, representing District 9 since 1981 until 2013. Prior to his election to the Senate, he was a member of the Minnesota House of Representatives from District 9B from 1975 to 1979. His district included portions of Becker, Clay, Otter Tail, Traverse and Wilkin counties in the northwestern part of the state.