Holy Cross Church, Parish church in Detmold, Germany.

Heilig Kreuz is a three-aisled basilica built from pumice concrete with a tall white tower block topped by a green-patinated roof and cross. The tower facade has two stacked groups of three narrow arched windows with dark louvers and a large circular window. A lower wing with a red tiled hipped roof and multi-paned windows adjoins the tower.

A new church was decided on in 1917, also to serve as a garrison church, funded by the military administration, the Bonifatius-Verein and parishioners. A 1937 design by Josef Lucas was not built for financial reasons. After refugees swelled the congregation post-war, dean Augustinus Reineke proposed a double church; Lucas and Hermann Gehrig developed the final plan. The foundation stone was laid on 3 May 1950 and the church was consecrated on 11 March 1951. It was listed as a monument in 2009.

The church's three steel bells, cast by the Bochumer Verein in 1950 and 1951, are dedicated to Bonifatius, Maria and Vitus; Vitus was Detmold's patron saint until the Reformation. The name Heilig Kreuz refers to the Holy Cross. The building has been a listed monument since 2009, together with part of its furnishings.

The church stands at a street corner in Detmold, its entrance set in the tall tower block on the main facade. The interior is divided by a transept into a larger Sunday church and a smaller weekday church, so expect two distinct worship spaces. The building and part of its furnishings have been protected as a monument since 2009.

The tower holds three cast-steel bells made by the Bochumer Verein in 1950 and 1951, tuned to f', as' and b'. They are dedicated to Boniface, Mary and Vitus, the patron saint of Detmold until the Reformation. The largest recalls the town's old Boniface patronage, the second the Marienanger Augustinian convent that existed in Detmold from 1453 to 1602.