Knittelfeld is a city in the Austrian state of Styria. It lies on the banks of the Mur river.
The city is situated in the Mur valley, in the central part of Styria. Its position along the river has shaped its development as a settlement in the region.
Knittelfeld is one of the towns of the Styrian Mur valley, and its riverside location on the Mur is its defining geographic feature.