The Josefův Důl Reservoir () is a reservoir in Josefův Důl in the Liberec Region of the Czech Republic. It was built on the Kamenice River in 1976–1982 and is the largest reservoir in the Jizera Mountains.
The reservoir has an area of . The dam has a height of and a length of . The reservoir has a capacity of 23 million cubic metres and its maximal depth is . Its main purpose is the supply of drinking water, so recreational activities are not permitted upon it.
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