| Election Name: | 1989 West Berlin state election |
| Country: | West Berlin |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 1985 West Berlin state election |
| Previous Year: | 1985 |
| Next Election: | 1990 Berlin state election |
| Next Year: | 1990 |
| Seats For Election: | All 138 seats of the Abgeordnetenhaus of Berlin |
| Majority Seats: | 70 |
| Election Date: | 29 January 1989 |
| Turnout: | 1,220,423 (79.6%) |
| Leader1: | Eberhard Diepgen |
| Party1: | Christian Democratic Union (Germany) |
| Last Election1: | 69 seats, 46.4% |
| Seats1: | 55 |
| Seat Change1: | 14 |
| Popular Vote1: | 453,211 |
| Percentage1: | 37.7% |
| Swing1: | 8.7% |
| Leader2: | Walter Momper |
| Party2: | Social Democratic Party of Germany |
| Last Election2: | 48 seats, 32.4% |
| Seats2: | 55 |
| Seat Change2: | 7 |
| Popular Vote2: | 448,203 |
| Percentage2: | 37.3% |
| Swing2: | 4.9% |
| Party3: | Alliance 90/The Greens |
| Seats3: | 17 |
| Seat Change3: | 2 |
| Popular Vote3: | 141,529 |
| Percentage3: | 11.8% |
| Swing3: | 1.2% |
| Party4: | The Republicans (Germany) |
| Last Election4: | Did not exist |
| Seats4: | 11 |
| Seat Change4: | 11 |
| Popular Vote4: | 90,222 |
| Percentage4: | 7.5% |
| Swing4: | New |
| Party5: | Free Democratic Party (Germany) |
| Last Election5: | 12 seats, 8.5% |
| Seats5: | 0 |
| Seat Change5: | 12 |
| Popular Vote5: | 47,153 |
| Percentage5: | 3.9% |
| Swing5: | 4.6% |
| Map Size: | 300px |
| Governing Mayor | |
| Before Election: | Eberhard Diepgen |
| Before Party: | Christian Democratic Union of Germany |
| After Election: | Walter Momper |
| After Party: | Social Democratic Party of Germany |
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.