The Hamburg state election, 2004 was conducted on 29 February 2004 to elect members to the Hamburgische Bürgerschaft (state and city legislature) of Hamburg. It was the 18th legislative period of the Hamburg Parliament.
In December 2003 the coalition of CDU, Offensive and FDP lost its majority after Ronald Schill, former Senator of the Interior, left the Offensive with five other MPs. He had been dismissed by first Mayor Ole von Beust in August 2003.
Ole von Beust was able to form a majority CDU government without the support of partners. His former coalition partners FDP, Offensive and Ronald Schill, who had split from the Offensive along with several allies, failed to return to the parliament.