Kristin Halvorsen (born September 2nd 1960 in Horten, Vestfold) is a Norwegian Politician. Since 1997, she has been the leader of Sosialistisk Venstreparti. Halvorsen has been a member of Parliament, representing the county of Oslo, since 1989. She was also a Vice Member of Parliament between 1985 and 1989. She is a member of Parliament's Election Committee and Foreign Affairs Committee, as well as being the leader of the Group of Sosialistisk Venstreparti's Members of Parliament.