Ernst-Thälmann-Park

thumb|240px|Ernst Thälmann monument and two of the residential houses in the park thumb|Zeiss Major Planetarium Ernst-Thälmann-Park is a park in the centre of the Prenzlauer Berg district in Berlin. It was laid out in 1986 at the site of a former coal gas plant and named after the former Communist party leader Ernst Thälmann (1886–1944).

The former plant, built in 1874, was closed in 1981, with the last gasometer demolished in 1984. In honor of Berlin's 750-year jubilee, the East German government drew up plans for an "inhabited park", including a memorial, a public pool, a planetarium, a school, and a housing estate for 4,000 residents. The park was inaugurated on 16 April 1986, Thälmann's hundredth birthday. The soil and groundwater were extensively contaminated with cyanides, phenols and tar that had to be cleared by excavation and bioremediation after German reunification. Though there had been some discussion about the name, a majority of local inhabitants voted against a change in 1997. Today the park features public houses as well as art galleries and a small theatre at the former administrative building of the gas plant.