Apostelkirche, Protestant church in Frohnhausen district, Essen, Germany.

The Apostelkirche is a Protestant church complex in Frohnhausen, built from 1912 to 1913 to designs by architect Ewald Wachenfeld. It consists of the church, a parish house and a community hall, with a 48-metre tower modelled in many details on the Campanile in Venice. The interior follows the Wiesbadener Programm, placing altar, pulpit, choir stage and organ in a single line.

The foundation stone was laid on 23 June 1912 at the corner of Berliner Strasse and Mülheimer Strasse, after a procession from the Kronenberg workers' colony; a time capsule inside held the foundation charter, local newspapers, the celebration programme and current coins. The design by Hagen architect Ewald Wachenfeld had won the 1911 competition. The church was consecrated in 1913 and deconsecrated in October 2025.

The church's name refers to the twelve apostles, whose figures and emblems were designed by Düsseldorf artist Wilhelm Döringer for the original stained-glass windows in muted grey and brown tones. Above the altar, a large inscription of Martin Luther's hymn line "Ein feste Burg ist unser Gott" once arched over the organ. The building was deconsecrated in October 2025.

The church was deconsecrated in October 2025, so it no longer holds services. The tower, modelled on the Campanile in Venice, stands 48 metres high and its clock faces, 3.85 metres across, were the largest in Essen in 1913. East of the church stands Otto Bartning's emergency church, listed as a monument in August 2022.

The tower's three cast-steel bells, weighing 1,200, 1,560 and 2,600 kg, were lowered through openings in the floor on 7 February 1913 and first rung three days later. The openings were then sealed so firmly that they could not be reopened during World War II, sparing the bells from the metal collection drive. The tower clock, made by J. F. Weule, had been shown at the Brussels 1910 and Turin 1911 exhibitions.