Mannheimer Rosengarten, Concert hall and convention centre in Mannheim, Germany

The Mannheimer Rosengarten is a concert hall and congress centre on the north side of Friedrichsplatz in Mannheim's Innenstadt, opposite the Wasserturm. Bruno Schmitz designed the Art Nouveau festival hall, built 1900–1903; its long red sandstone facade carries five dormer windows, a row of five round-headed arches and a pale green glazed-tile roof, with a domed round-headed section projecting to the right.

Built 1900–1903 by the firm Joseph Hoffmann & Söhne to a design by architect Bruno Schmitz as Mannheim's municipal festival hall in Art Nouveau style. Its Nibelungensaal held 6,000 seats, one of Germany's largest halls. Heavily damaged in the Second World War, the historic front building with the Musensaal was restored externally; behind it a modern extension by Karl Schmucker opened in 1974, and Andreas Schmucker's expansion followed in 2006/07.

The name Rosengarten predates the flower: it refers to the rose garden of the former Mannheim palace, on whose grounds the hall was built. The Mozartsaal hosts the Musikalische Akademie's Nationaltheater Orchestra and concert series by SWR ensembles; the Staatsphilharmonie Rheinland-Pfalz plays mainly in the Musensaal. Since 2017 the AnimagiC anime convention has met here.

The complex is located near Friedrichsplatz and is well served by public transportation. It features multiple entrances, sufficient parking, and is accessible for visitors with limited mobility.

The Nibelungensaal, one of Germany's largest halls with 6,000 seats, was not rebuilt after wartime destruction; the 1974 Mozartsaal by Karl Schmucker took its place behind the restored front building, and Andreas Schmucker's 2006/07 glass cube nearly doubled the floor area.