Pfarrkirche Sindelburg, Protected parish church in Wallsee-Sindelburg, Austria.

Pfarrkirche Sindelburg is a protected parish church in Wallsee-Sindelburg featuring robust buttresses, narrow windows, and a steep gable roof. A 50-meter tower with a historically modified spire forms the main vertical element of the structure.

The church was built during the late Gothic period, with the nave completed around 1504. A fire in 1750 damaged the original structure, leading to the installation of a new Baroque vault system in the main and side naves.

The parish holds the oldest registers in the Diocese of St. Pölten, begun in 1581. In the choir, the wall retables of around 1780 carry altarpieces by Martin Johann Schmidt from 1781: Saint Sebastian interceding for plague victims, and Saint Leonard as patron of farmers. The pulpit of around 1680 has small statues of the Evangelists and trumpet-blowing angels on its canopy.

The church stands on a hill in the hamlet of Sindelburg, surrounded by its cemetery, in the municipality of Wallsee-Sindelburg. The graveyard lies directly around the building, and the graves of the Wallsee castle owners are at the eastern outer wall of the choir. Visitors reach the site on foot from the village; the hilltop position makes the church visible from a distance.

In the choir hangs a heraldic epitaph with a chronogram for Sigismund Engstler, dated 1721. Outside, on the east wall of the choir, lies the crypt of the owners of Wallsee Castle, where Archduchess Marie Valerie (1868–1924) and Archduke Franz Salvator (1866–1939) are buried.