Tuzkol () is a salt lake in Bayanaul District, Pavlodar Region, Kazakhstan.
The lake lies southwest of the town of Bayanaul.
Geography
Tuzkol lies in a tectonic depression of the Kazakh Uplands to the southwest of the eastern part of the Bayanaul Range and to the east of the Ashchysu river. It is the largest of the lakes of the district. Zhanatilek village is located to the south of the southern shore.
River Karasu, an intermittent stream, flows into the lake from the east. The water of the lake is saline, containing magnesium and sodium chloride. There is an to thick layer of mud at the bottom of the lake emitting a strong hydrogen sulfide smell. The mud is used locally for medicinal purposes.