Freyschlössl, Medieval tower house on Mönchsberg, Salzburg, Austria

Freyschlössl is a tower house with medieval origins perched on the Mönchsberg overlooking Salzburg, offering twelve rooms spread across multiple levels. The building consists of an old tower core with a modern extension added in the 2010s.

The Red Tower was probably built in the late 13th century to guard the gap between the Mönchsberg and the Festungsberg and its city gate. A 1372 lawsuit confirmed that the tower and the nearby Abtsturm had belonged to St. Peter's Abbey since time immemorial. Carl von Frey bought the tower on 22 March 1862 and had it renovated in neo-Gothic style by the builder J. Götz.

The tower's name recalls Carl von Frey, who bought it on 22 March 1862 and had builder J. Götz renovate it inside and out in a neo-Gothic style. For the inauguration on 11 June 1863, members of the Flögelwarte, a choral and classical music society founded by the physician Carl Flögel, sang. The geographer Eduard Richter married Frey's only daughter Juli in 1872; she died in 1873 giving birth to their daughter.

The tower stands on Mönchsberg no. 15, north of the Oskar-Kokoschka-Weg, on the path between Hohensalzburg Fortress and the Richterhöhe. The building is privately owned and was restored after 2009, so it is not open to visitors; the surrounding paths are public and the site can be seen from outside.

The tower kept its square plan and pyramidal roof until the early 19th century, when a cow shed, a wooden hay loft and a covered cistern stood beside it. In 1862 Carl von Frey bought the tower and had builder J. Götz renovate it in neo-Gothic style; at the inauguration on 11 June 1863 members of the Flögelwarte choir sang.