Stiftskirche Windecken, Medieval church in Windecken, Germany

Stiftskirche Windecken is the Protestant church of Windecken, now part of Nidderau. Its oldest parts, the nave and choir with an oak roof truss felled between 1265 and 1268, date from shortly after 1268; a choir arch bearing the coat of arms of the Lordship of Hanau separates the two. A 35-metre tower was added in 1484, the side aisles in 1495–1500, and the tower received its three-stepped baroque helm in 1706.

The church was first documented in writing in 1282 as a 'capella nova', suggesting an even older place of worship existed at this location before that time. The Gothic era brought major renovations including the addition of a tower in 1484 and the construction of side aisles between 1495 and 1500.

The name "Stiftskirche" dates from 1819, when pastor mistook the former Reformed church for a collegiate foundation; no evidence supports a pre-Reformation Stift. Before the Reformation the church was dedicated to Saint Cyriacus and held altars to Mary, Saint George, Saint Catherine, the Holy Trinity and the Holy Cross. Since 1950 the bells play the "Wachet auf" motif.

The church stands in the old town of Windecken, a district of Nidderau. The south aisle entrance carries the date 1500 in its floor, and the west portal bears the 1761 Nidder flood mark. The tower's baroque helm, added in 1706, rises in three stepped stages above the 35-metre tower body.

A carved inscription on the western portal marks the floodwater level from a major river overflow that occurred in 1761. This mark remains a rare record of the natural disaster that once threatened the building and surrounding area.