Alt St. Margareta, Late Gothic brick church in Landshut, Germany

Alt St. Margareta is the late Gothic brick church of Achdorf, built around 1440 by successors of Hans von Burghausen. It has a nave with four bays, a recessed two-bay choir ending in three sides of an octagon, and a west tower topped by an octagonal neo-Gothic spire. The exterior is largely unplastered, with buttresses capped by pent roofs and a simple frieze band under the eaves.

The old parish church of Achdorf, a late Gothic brick hall church, was probably built around 1440 by successors of Hans von Burghausen; a bell inscription bears that year. It was partly remodelled in the Baroque period and restored in 1872, 1888 and 1971. The growing congregation led to a new church by Heinrich Hauberrisser, whose foundation stone was laid in 1909 and which was consecrated in 1922.

The parish is dedicated to Saint Margaret of Antioch; Cardinal Faulhaber consecrated the new church under her patronage on 19 November 1922. The high altar was made in Regensburg in 1913–1914 to a design by Heinrich Hauberrisser, and the side altars were carved in 1930 by sculptor Jakob Adlhart of Hallein. The organ followed in 1937, built by Munich maker Hans Haas.

The building is centrally located in the historic old town and easy to reach on foot when walking through Hagengasse street. The exterior architecture can be viewed at any time, allowing unrestricted visits.

The old church's three late-Gothic altar figures of Mary, Barbara and Catherine, carved around 1480, were combined into a single new shrine during the 1971 renovation; they had already been reworked and repainted in 1872. An alabaster figure of Saint Margaret from around 1440 and the wide octagonal baptismal font from the church's own construction period also survive.