Museum Zeughaus, Cultural heritage monument in Mannheim, Germany.

Museum Zeughaus is a Baroque military building in Mannheim with a distinctive facade and spacious interior rooms for exhibitions. The structure displays the classic features of a former weapons armory with thick walls and high ceilings, now used as exhibition spaces.

The Zeughaus was built in the 18th century as a weapons store for Mannheim's fortress and played a key role in the city's military infrastructure. After the fortress era ended, the building was repurposed and has served as a museum documenting the city's story since the 20th century.

The Zeughaus originally served as a military arsenal and continues to shape how visitors understand Mannheim's role as an important administrative and commercial hub. The exhibitions show how closely the city's story connects to its past as a fortified stronghold and later as an economic center.

The museum occupies the Quadrat C5 block of the Mannheim Innenstadt, with the entrance area on the ground floor leading to the Schatzkammer and porcelain collection. Exhibitions are spread over the basement and four upper floors, so allow time to move between levels. The Heinrich-Vetter-Saal on the first floor is reserved for temporary exhibitions.

The 2003–2007 renovation cost 17.32 million euros and created 6,000 square metres of exhibition space with new museum technology. On the third floor, the theatre collection keeps the original prompt book for Friedrich Schiller's Die Räuber, printed in 1782.