Mitterdorf im Mürztal is situated at an elevation of 587 m in the valley of the river Mürz.
The first mentioning of a noble seat in Mitterdorf dates from 1363. This was replaced in the 16th century by
a new castle (Schloss Pichl). Mitterdorf was the birthplace of Johann Nepomuk Ritter von Kalchberg (1765–1827) who was
the most important Austrian playwright of his time and also was well-known for his work as a historian. The castle is used
today as a school for forestry.
On 1 January 2015, the formerly independent municipalities of
Mitterdorf im Mürztal, Veitsch and Wartberg im Mürztal
were merged to become the new municipality of Sankt Barbara im Mürztal.