米尔茨河是奥地利的河流，位于该国东南部，河道全长98公里，发源自下奥地利邦，流经施蒂利亚州，最终在穆尔河畔布鲁克附近注入穆尔河。

The Mürz is a river in Austria.

It begins north of the Schneealpe in Lower Austria, flows into Styria, and meets the Mur River after 98 km in Bruck an der Mur. Its headwaters end at Mürzzuschlag. Along its course are the tracks of the Southern Railway as well as the Semmering Highway.