拉贝河畔乌斯季（捷克语：Ústí nad Labem，德语：Aussig，奥西格）位于捷克拉贝河畔乌斯季州比利纳河与易北河（拉贝河）的交汇处，是该州的首府，人口约9.4万（2005年）。

Ústí nad Labem (Czech pronunciation:[ˈuːsciː ˈnad labɛm]), formerly known by its German name Aussig, is the 7th-most populous city of the Czech Republic. It is the capital of its eponymous region and district. Ústí is situated in a mountainous district at the confluence of the Bílina and Elbe rivers. It is a major industrial center and, besides being an active river port, is an important railway junction.