The 1989 West Berlin state election was held on 29 January 1989 to elect the members of the 11th Abgeordnetenhaus of Berlin. This was the last election held in West Berlin before the reunification of Germany and Berlin.^[1] The CDU suffered a severe defeat under its top candidate, the Governing Mayor Eberhard Diepgen, who had been in office since 1984. It fell by 8.7 percentage points and ended up with 37.7% of the votes just ahead of the SPD, which gained 4.9 percentage points to 37.3% under its lead candidate Walter Momper. Together with the Alternative List (AL), this resulted in a clear majority for a red–green coalition.

Quick Facts All 138 seats of the Abgeordnetenhaus of Berlin 70 seats needed for a majority, Turnout ...

1989 West Berlin state election

← 1985 29 January 1989 1990 →
All 138 seats of the Abgeordnetenhaus of Berlin 70 seats needed for a majority
Turnout	1,220,423 (79.6%)
First party Second party Third party   Leader Eberhard Diepgen Walter Momper Party CDU SPD Greens Last election 69 seats, 46.4% 48 seats, 32.4% 15 seats, 10.6% Seats won 55 55 17 Seat change 14 7 2 Popular vote 453,211 448,203 141,529 Percentage 37.7% 37.3% 11.8% Swing 8.7% 4.9% 1.2%   Fourth party Fifth party   Party REP FDP Last election Did not exist 12 seats, 8.5% Seats won 11 0 Seat change 11 12 Popular vote 90,222 47,153 Percentage 7.5% 3.9% Swing New 4.6%
Results for single-member constituencies.
Governing Mayor before election Eberhard Diepgen CDU Elected Governing Mayor Walter Momper SPD

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