Heilig Kreuz, Architectural heritage monument in Gelsenkirchen, Germany.

Heilig Kreuz is a former Catholic parish church in Gelsenkirchen-Ückendorf, built from 1927 to 1929 to plans by Josef Franke. The blocky structure of clinker brick and rendered reinforced concrete stands behind a courtyard. Its west facade rises between forward chapels and halls, crowned by a monumental brick crucifix with a clothed corpus after designs by Hans Meier; the pointed portal and large window share a steep parabolic arch.

Construction took place between 1927 and 1929 under architect Josef Franke and served the Catholic community for around 80 years until closure in 2007. This long period of religious use was followed by transformation into a cultural venue.

The parish was founded as a vicariate in 1927 and remained a parish from 1948 to 2007, when the diocese of Essen took the church out of service on 19 August 2007. Since spring 2022 the converted building has hosted small-scale stage events run by Emschertainment. The brick parapet carries verses from Venantius Fortunatus's hymn Vexilla regis set in brickwork.

The church stands back from the street behind a courtyard, with residential and commercial buildings flanking the entrance; the northern courtyard wing was only added in 1957. Renovation finished in spring 2022, and Emschertainment now runs small-scale stage events there. The five bells cast in 1959 by Feldmann & Marschel were removed in June 2019 and stored until the diocese decides their future.

The 41-metre tower holds five bells cast in 1959 by Feldmann & Marschel of Münster, tuned cis-e-fis-gis-a. They were taken down in June 2019 during the conversion and stored until the diocese of Essen decides on their future use.