Platzeck III SPD–The Left The 2009 Brandenburg state election was held on 27 September 2009 to elect the members of the 5th Landtag of Brandenburg.

The incumbent government of the Social Democratic Party (SPD) and Christian Democratic Union (CDU) led by Minister-President Matthias Platzeck took small losses, but retained a majority.

However, the SPD chose to form a government with The Left rather than continue the SPD–CDU coalition.

[1] The election saw the Free Democratic Party and The Greens re-enter the Landtag for the first time since the 1990 election, while the German People's Union lost all its seats.

The table below lists parties represented in the 4th Landtag of Brandenburg.