Alte Oper, Theatre in Erfurt, Germany

The Alte Oper is a theatre at Gorkistraße 1 in Erfurt's old town, about 400 metres south of the cathedral. Heinrich Sahlender built it in 1867 in neoclassical style; Paul Peters converted it into a municipal theatre and opera house in 1893–95. The hall seats 970 and has a revolving stage and 32 fly bars.

Heinrich Sahlender built the house in 1867 as a summer theatre. The city bought it in 1892 and had Paul Peters convert it into a municipal theatre and opera house, opened on 15 September 1894. Renamed Deutsches Volkstheater under the Nazis, it survived the war undamaged and reopened on 21 June 1945; after closure in 1997, Wolfgang Staub restored it and reopened it on 15 September 2004.

The house is one of three venues of Wolfgang Staub's event centre DASDIE, which reopened it on 15 September 2004 after a renovation costing about two million euros. Its programme covers operettas, musicals, revues, cabaret and concerts rather than the opera that gave it its name.

Elevators and ramps throughout the building provide access for people with mobility challenges to reach all performance areas. Clear signage at entrances helps visitors navigate the space easily.

The building was closed on 8 June 1997 for building-code reasons; the city estimated renovation at 80 million DM and instead built a new theatre, opened in 2003. Entrepreneur Wolfgang Staub then leased the empty house, restored it for about 2 million euros and reopened it on 15 September 2004.