Schloss Marbach, Heritage castle in Ried in der Riedmark, Austria.

Schloss Marbach is a three-storey castle with a rectangular footprint in Ried in der Riedmark. North of the main wing and chapel, a two-storey arcaded wing extends west and meets a cross-standing economic wing on the north side. These buildings, with a wall on the east, enclose a courtyard containing an ornamental garden and two fountains on lawns.

Schloss Marbach was first documented in 1145, when Eberhardus de Marpach appeared as a charter witness. The last Marpach, Ulrich, did not return from a crusade in 1217, and the castle passed to the sovereign. Burned by Hussite raids in 1424, it was rebuilt from 1484 by Wolfgang von Rohrbach as a moated fortress. In 1623 the Engelhofer heirs sold it to Stift Sankt Florian, which held it for exactly 250 years; a major rebuild from 1706 to 1710 gave it its present form.

The name Marbach comes from the Marpach family, first recorded in 1145 with Eberhardus de Marpach; the last, Ulrich de Marpach, did not return from a crusade in 1217. Members of the Engelhofer family, who held the estate from 1619, are buried in St. Florian Abbey, where three metal coffins stand in a crypt chapel. The castle is privately owned and lived in, so it is normally not open to the public.

Schloss Marbach is privately owned and still inhabited, so it is generally not open to the public; the castle chapel and the economic building are separately listed monuments. The grounds are leased and the farmyard has been abandoned. Views of the three-storey rectangular main block, the two-storey arcaded wing and the courtyard with its ornamental garden and two fountains are from outside.

The castle chapel at the southwest corner was built in 1686–1689 by Carlo Antonio and Giovanni Battista Carlone; inside hangs Johann Michael Rottmayr's 1704 painting of the beheading of Saint Catherine. The chapel is separately listed as a monument, as is the economic building.