Sankt Nikolaus parish church, Catholic parish church in Haslach an der Mühl, Austria

Sankt Nikolaus is a late Gothic parish church in Haslach an der Mühl, with a single-nave, four-bay hall and a choir built around 1400, the oldest part; the nave dates from around 1500. The vaulting is by Hans Getzinger, and the interior has a uniform neo-Gothic furnishing. The defensive tower stands north of the nave, with late Gothic slit windows and a neo-Gothic columned gallery.

The choir, the oldest part of the church, was built around 1400, and the nave followed around 1500. The church was incorporated into Schlägl Abbey and belongs to the Diocese of Linz. In 1906, cathedral master builder Matthäus Schlager raised the tower to 63 metres, opening the former defensive walkway into a gallery and adding four corner turrets and a steep pyramidal roof in the neo-Gothic style.

The church is dedicated to Saint Nicholas and serves the community as a place for Sunday services and religious celebrations. The interior decorations, altars, and statues from different periods show how religious practice and artistic taste evolved over the centuries.

The church stands in the centre of Haslach an der Mühl, with the tower rising north of the nave; its late-Gothic round-arch portal on the south side and the slit windows and loopholes on the outer walls are visible from outside. The old charnel house lies on the south side beneath the sacristy. A war memorial of 1928 by Adolf Wagner von der Mühl stands on the north side, with bronze plaques by Max Stockenhuber added in 1966.

On the tower's east wall is a red marble fragment of a gravestone for the stonemason Kajetan Getzinger, who died in 1544; it shows his mason's marks and family coat of arms. He was a relative of Hans Getzinger, whose vaulting shapes the church interior.