Kremsmünster is a town in Kirchdorf an der Krems District, in the Austrian state of Upper Austria.

The monks (Order of Saint Benedict), lead a famous gymnasium which has existed since 1549, and an astronomical and geophysical observatory ("Mathematical tower").

For instance, Placidus Fixlmillner (1721–1791), the first astronomer to compute the orbit of Uranus, was born and lived in Kremsmünster.

It is also crossed by the Meridian arc Großenhain-Kremsmünster-Pola, an 800 km triangulation which was measured in the 19th century to determine the alpine curvature of the geoid.

The showpiece of the monastery's treasury is the Tassilo Chalice of about 770, created in copper and silver and holding 1.8 litres.