Marienmünster church, Baroque church in Dießen am Ammersee, Germany

Marienmünster is a single-nave wall-pillar church built by Johann Michael Fischer between 1732 and 1739. Its west facade has grey pilasters, a rounded-arch portal with a dark wooden door, two oval windows, three tall rectangular windows and a gold emblem; a haloed statue and a gold star sit above. The tower carries a clock and a dark bulbous dome with a spire.

Construction of the current structure began in 1720 under Provost Ivo Bader, with architect Johann Michael Fischer shaping its final form. This partnership left a lasting mark on the region's Baroque architecture.

The name Marienmünster, adopted when Bishop Josef Stimpfle raised the parish church to that title in 1989, refers to the church's dedication to Mary. In the nave fresco, Bergmüller painted himself in a white work coat and blue painter's cap, watching Saint Mechthild enter Dießen's convent of St. Stephan. The dome fresco of 1736 gathers 28 saints and blessed of the House of Andechs-Merania around Christ.

The building is located at Klosterhof 10A and maintains regular opening hours for visits and services. Visitors should note that access may be limited during worship services and masses.

Karl Richter recorded Johann Sebastian Bach's Mass in B minor in the church in 1969. The organ behind that recording, built by Caspar König around 1739, was rebuilt in 1878 and restored by Orgelbau Schmid in 1959; work in 1984–1987 added a swell and more registers, giving it 39 registers on three manuals and a pedal.