Ulz River (, ) is a river in Mongolia, which partially flows in Transbaikal, Russia, within the Daursky Nature Reserve. It flows into the Barun-Torey () lake.
At about before the mouth, a branch to the right is split named (ÃÂõûøùý óþû) (which until 2013 was dry for many years) which delivers water into the river èÃÂôÃÂ-ÃÂþû (Shudu Gol), which sinks into the lake Khökh Nuur.
In 2014, around of water was withdrawn from the river for livestock and industrial use.