RUHR Tower, Commercial high-rise building in Essen, Germany

RUHR Tower is a 22-story high-rise with modern architecture from the 1960s standing in Essen's business district. The building combines office spaces and commercial areas under a unified design typical of international architecture from that era.

The Rheinstahl steel group had the tower designed by Dortmund architect Albert Peter Kleinwort, with Hanns Dustmann later joining the planning; the foundation stone was laid in October 1959 and the 76.9-metre, 22-storey building was handed over in May 1961. Concrete piles tied to bedrock and a torsion-resistant hollow-box foundation guarded against mining subsidence. After Thyssen took over Rheinstahl in 1976 the house became the Thyssenhaus, and in 1999 the Thyssen lettering gave way to the three Krupp rings.

The street southeast of the tower was first called Am Rheinstahlhaus and was renamed Am Thyssenhaus in February 1977 after Thyssen took up residence. The tower's steel skeleton has an inner reinforced-concrete core holding the lifts and stairwells, and the 19th floor conference level and foyer survived the 2016/2017 renovation.

The tower stands in the Südviertel, south of Essen's city centre, near the Kruppstraße tunnel of the Ruhrschnellweg. The 1963 seven-storey annexe and the 1964 connecting bridge link it to the main high-rise. The 19th-floor conference level and the foyer were kept during the 2016/2017 renovation.

The tower's steel skeleton rests on concrete piles tied to bedrock, a hollow-box foundation designed against mining subsidence from suspected unfilled coal seams beneath Essen. The 19th-floor conference level and the foyer survived the 2016/2017 renovation, which replaced the grey natural stone facade with steel, glass and aluminium in the same line pattern.