The Protestant church was built in 1910 in Art Nouveau style, after the former Reformed church in Kirchstraße from 1739 had become too small and dilapidated. It is named after King Gustav II Adolf, who entered the Thirty Years' War in 1630 as a Protestant army commander of the Swedes. His image is shown in a church window on the west side. For four years from the winter of 1631/32, the Swedes ruled the Ingelheim area after driving out the Spanish occupation.
The construction of the church was financed by donations, in which the Grand Duke Ernst-Ludwig from Darmstadt personally participated. The names of some of the donors can be found in the stained glass windows depicting scenes from the New Testament. The Frankfurt painter Otto Linnemann designed the interior in the colorful ornamentation of the Darmstadt Art Nouveau style. The woodwork was done by the local master carpenter Johann Krück. Since the restoration in 1992/93, the interior of the church can be admired again in its original design.
