Ingvar Carlsson (born 9 November 1934 in Borås, Västra Götaland County (then Älvsborg County), Sweden), is a Swedish politician, former Prime Minister of Sweden (March 1986–October 1991; October 1994–March 1996) and leader of the Social Democratic Party (March 1986–March 1996). He became Prime Minister in 1986 when Olof Palme was assassinated.