开姆尼茨（德语：Chemnitz，索布语：Kamjenica，捷克语：Saská Kamenice，波兰语：Kamienica Saska）市是德国萨克森州西部的一个城市。开姆尼茨有近二十五万居民，是位于莱比锡和德累斯顿之后的该州第三大城市，也是该州六个Oberzentren之一。开姆尼茨具有州直辖市地位，并且是同名的行政专区所在地。开姆尼茨的城市格言是“有头脑的城市”（Stadt mit Köpfchen）。

该市同茨维考一起构成了“开姆尼茨－茨维考经济区”的核心，也是“萨克森三角都市群”的组成部分。

Chemnitz (German pronunciation:[ˈkɛmnɪt͡s]), known from 1953 to 1990 as Karl-Marx-Stadt, is the third-largest city in the Free State of Saxony, Germany. Chemnitz is an independent city which is not part of any county and seat of the Freistaat Sachsen. Located in the northern foothills of the Ore Mountains, it is part of the Central German Metropolitan Region. The city's economy is based on the service sector and manufacturing industry. Chemnitz University of Technology has around 10,000 students.