Mníšek (German: Einsiedel in Isergebirge) is municipality and village in Liberec District in the Liberec Region of the Czech Republic. It has about 1,700 inhabitants.
The village of Fojtka is an administrative part of Mníšek.
Mníšek is located in the Jizera Mountains valley of the Jeřice River, a tributary of the Lusatian Neisse, 8 kilometres (5.0 mi) north of Liberec and 95 kilometres (59 mi) northeast of Prague.
The municipality is bordered by Frýdlant and Oldřichov v Hájích to the north, Hejnice and Bedřichov to the east, Liberec to the south, and Nová Ves to the west.