St. Peter im Moos, Gothic parish church in Winzendorf-Muthmannsdorf, Austria

St. Peter im Moos is a Gothic parish church in Winzendorf-Muthmannsdorf with a rectangular tower and frescoes in the choir area. The building features stained glass windows by Tyrolean artisans from the 1940s and an organ built by Franz Capek in 1901.

A 1136 charter records the noble Adalram and his wife Richinza giving a manse near Waldeck, land for a church and priest's house, tithes and five unfree people to the Salzburg church; whether it refers to Muthmannsdorf or Waldegg is disputed, and the first secure mention of Muthmannsdorf as a parish is from 1220. In 1254 Ottokar granted the patronage to Bishop Ulrich I of Seckau, and in 1358 the parish passed to Seckau Abbey. In 1662 the Seckau cathedral chapter sold the estate and patronage to Neukloster Abbey in Wiener Neustadt.

The parish is dedicated to Saints Peter and Paul, and its high altar day, the Peters-Tag, was one of the feasts on which Maiersdorf residents had to come to Muthmannsdorf after the two parishes were united in 1379. The church keeps medieval frescoes in its Romanesque-Gothic interior.

The church sits on Kirchenstraße 2 and belongs to the Diocese of Vienna with regular services held here. Visitors should note that concerts from the Lower Austrian Master Concert series take place in the building, which is a protected monument.

The 1136 founding charter survives in the Austrian State Archives, but it names no place, so both Muthmannsdorf and Waldegg parishes claim it. Building researcher Erwin Reidinger measured the church and found its nave axis aligned to sunrise on 29 June 1136, the feast of Peter and Paul, with the choir axis on 19 July 1136, producing a 5.3° bend in the axis.