Kirche Müllenbach, Protestant church in Marienheide, Germany.

Kirche Müllenbach is a white-plastered Romanesque basilica in Marienheide with a cross-shaped plan: a long nave with lower side aisles linked by arcades, a square west tower with a steep pyramidal roof and clock face, and a taller Gothic transept ending in a rounded apse. It was built as a fortified church of Westphalian-Saxon type.

The stone church building was completed around 1097, replacing an earlier wooden chapel that had served the community since the 9th century. This transition marked the development from a simple prayer house to a substantial parish church.

The church is one of the three Bonten Kerken of the Oberbergisch region, alongside Wiedenest and Lieberhausen, and its interior walls carry painted murals. The octagonal font was carved from Drachenfels trachyte, hauled laboriously from the Siebengebirge. The Zuckerhut bell, cast in the 12th century, hangs among the bells.

The church stands in the Müllenbach district of Marienheide, in the Oberbergischer Kreis. It is a parish church of the Müllenbach-Marienheide congregation in the Kirchenkreis An der Agger; visitors should check service times before coming, as the building is used for worship. The interior was renovated in the 1990s with donated funds.

The bell tower holds the Zuckerhut bell from the 12th century, which is the oldest bell in the Oberbergisch region. This medieval bell represents a rare example of craftsmanship from that era.