| Election Name: | 1990 Berlin state election |
| Country: | Berlin |
| Type: | parliamentary |
| Ongoing: | no |
| Next Election: | 1995 Berlin state election |
| Next Year: | 1995 |
| Seats For Election: | All 241 seats of the Abgeordnetenhaus of Berlin |
| Majority Seats: | 121 |
| Election Date: | 2 December 1990 |
| Turnout: | 2,019,198 (80.8%) |
| Leader1: | Eberhard Diepgen |
| Party1: | Christian Democratic Union (Germany) |
| Seats1: | 101 |
| Popular Vote1: | 815,382 |
| Percentage1: | 40.4% |
| Leader2: | Walter Momper |
| Party2: | Social Democratic Party of Germany |
| Seats2: | 76 |
| Popular Vote2: | 614,075 |
| Percentage2: | 30.4% |
| Party3: | Party of Democratic Socialism (Germany) |
| Seats3: | 23 |
| Popular Vote3: | 184,820 |
| Percentage3: | 9.2% |
| Party4: | Free Democratic Party (Germany) |
| Seats4: | 18 |
| Popular Vote4: | 143,080 |
| Percentage4: | 7.1% |
| Color5: | 64A12D |
| Party5: | Greens (West) |
| Seats5: | 12 |
| Popular Vote5: | 100,839 |
| Percentage5: | 5.0% |
| Color6: | 64A12D |
| Seats6: | 11 |
| Popular Vote6: | 87,891 |
| Percentage6: | 4.4% |
| Map Size: | 400px |
| Mayor | |
| After Election: | Eberhard Diepgen |
| After Party: | Christian Democratic Union of Germany |
The 1990 Berlin state election was held on 2 December 1990 to elect the members of the 12th Abgeordnetenhaus of Berlin. This was the first election held in Berlin after the reunification of Germany and Berlin, and was held on the same day as the 1990 federal election.
The Christian Democratic Union (CDU) emerged as the largest party with 40.4%, with the Social Democratic Party (SPD) second on 30.4%. The Party of Democratic Socialism (PDS) won 9.2%, while the Free Democratic Party (FDP) won 7.1%. Two green parties, the Alternative List from the West and the Alliance 90 from the East, entered the Abgeordnetenhaus with 5.0% and 4.4% respectively. The 5% electoral threshold for entry was applied separately in the old West and East of the city, allowing both parties to enter despite both falling short of 5% statewide. They subsequently formed a joint parliamentary group, and later merged to become the Berlin branch of Alliance 90/The Greens.
A potential CDU–FDP government came up two seats short of a majority, and no left-of-centre arrangement was possible due to the presence of PDS. Thus, the CDU and SPD entered into a grand coalition, and CDU leader and former Mayor Eberhard Diepgen was elected as the first Mayor of reunified Berlin.[1]
The table below lists the parties and groupings competing in the election which were represented in the 11th Abgeordnetenhaus of West Berlin (elected in 1989) and the last city council of East Berlin (elected in May 1990). Parties are listed in order of the number of seats they held in both city legislatures.
| Name | Ideology | Leader(s) | 1989 result (West) | 1990 result (East) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Votes (%) | Seats | Votes (%) | Seats | |||||||
| bgcolor= | SPD | Social Democratic Party of Germany | Social democracy | Walter Momper | 37.3% | 34.1% | ||||
| bgcolor= | CDU | Christian Democratic Union of Germany | Christian democracy | Eberhard Diepgen | 37.7% | 18.4% | ||||
| bgcolor= | PDS | Party of Democratic Socialism | Democratic socialism | align=center colspan=2 | N/A | 30.1% | ||||
| bgcolor= | Bü90/Grüne/UFV | Alliance 90/Green/UFV | Green politics | align=center colspan=2 | N/A | 12.6% | ||||
| bgcolor= | Grüne/AL | Green/Alternative List | Green politics | 11.8% | align=center colspan=2 | N/A | ||||
| bgcolor= | REP | The Republicans | National conservatism | 7.5% | align=center colspan=2 | N/A | ||||
| bgcolor= | FDP | Free Democratic Party | Classical liberalism | 3.9% | 2.3% | |||||
| bgcolor= | DSU | German Social Union | National conservatism | align=center colspan=2 | N/A | 1.0% | ||||