The 2009 Brandenburg state election was held on 27 September 2009 to elect the members of the 5th Landtag of Brandenburg. It took place on the same day as the 2009 federal election and 2009 Schleswig-Holstein state election. 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]

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Quick Facts All 88 seats in the Landtag of Brandenburg 45 seats needed for a majority, Turnout ...

2009 Brandenburg state election

← 2004 27 September 2009 2014 →
All 88 seats in the Landtag of Brandenburg 45 seats needed for a majority
Turnout	1,388,722 (67.0%) 10.6%
First party Second party Third party   Leader Matthias Platzeck Kerstin Kaiser Johanna Wanka Party SPD Left CDU Leader's seat Uckermark I Märkisch-Oderland II State-wide party list Last election 33 seats, 31.9% 29 seats, 28.0% 20 seats, 19.4% Seats won 31 26 19 Seat change 2 3 1 Popular vote 458,840 377,112 274,825 Percentage 33.0% 27.2% 19.8% Swing 1.1% 0.8% 0.4%   Fourth party Fifth party Sixth party   FDP DVU Leader Hans-Peter Goetz Marie Luise von Halem & Axel Vogel Liane Hesselbarth Party FDP Greens DVU Leader's seat State-wide party list State-wide party list State-wide party list (lost re-election) Last election 0 seats, 3.3% 0 seats, 3.6% 6 seats, 6.1% Seats won 7 5 0 Seat change 7 5 6 Popular vote 100,123 78,550 15,903 Percentage 7.2% 5.6% 1.1% Swing 3.9% 2.1% 5.0%
Results for the single-member constituencies
Government before election Platzeck II SPD–CDU Elected Government Platzeck III SPD–The Left

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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.