Janův Důl () is a municipality and village in Liberec District in the Liberec Region of the Czech Republic. It has about 200 inhabitants.
Etymology The name means "Jan's/Johannes' valley" in Czech and German respectively. The village was named that way in 1704, after its owner Count Jan Václav of Gallas.
Geography Janův Důl is located about southwest of Liberec. In lies in the Ralsko Uplands. The highest point is at above sea level. The upper course of the Ploučnice River flows through the municipality.
History Janův Důl was founded in 1569.
Demographics
Transport There are no railways or major roads passing through the municipality.
Sights There are no protected cultural monuments in the municipality. The main cultural landmark is the Chapel of Saint John of Nepomuk, built in 1796.
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