Museum Ostwall, Modern art museum in Dortmund, Germany.

The Museum Ostwall occupies the Dortmund U-Tower, a seven-storey former Dortmund Union brewery and warehouse. Its collection fills several floors with paintings, sculptures, objects and photographs from the 20th and 21st centuries, plus more than 2,500 graphic works. The displays are rearranged twice a year.

Founded by a Dortmund council decision in 1947 as Museum am Ostwall, the museum opened its first exhibition in 1949 under founding director Leonie Reygers, making it one of Germany's first post-war museums of 20th-century art. It occupied a building on the Ostwall, partly rebuilt from ruins of the former Museum für Kunst und Kulturgeschichte. In June 2009 it closed there and in October 2010 reopened in the Dortmund U-Tower as Museum Ostwall.

The museum's name comes from the Ostwall, the street of its first home, and was kept when it moved into the former Dortmund Union brewery tower in 2010. Since 1962 a children's painting studio has offered courses, and the Jugendkunstclub lets young people meet artists and make their own work in the museum studio.

The museum sits on Leonie-Reygers-Terrasse and welcomes visitors from Tuesday through Sunday with extended hours on Thursday and Friday. Plan to spend time exploring the different exhibition levels at a comfortable pace.

The collection includes numerous works the Nazi regime condemned as 'degenerate art', preserving them as an act of cultural resistance. These paintings and sculptures tell a story of artistic freedom that survived despite suppression.