Oskar Lafontaine (; born 16 September 1943) is a German politician. He served as Minister-President of the state of Saarland from 1985 to 1998, and was federal leader of the Social Democratic Party (SPD) from 1995 to 1999. He was the lead candidate for the SPD in the 1990 German federal election, but lost by a wide margin. He served as Minister of Finance under Chancellor Gerhard Schröder after the SPD's victory in the 1998 federal election, but resigned from both the ministry and Bundestag less than six months later, positioning himself as a popular opponent of Schröder's policies in the tabloid press.