Mirsk [mʲirsk] (German: Friedeberg am Queis) is a town in Lwówek County, Lower Silesian Voivodeship, in south-western Poland. It is the seat of the administrative district (gmina) called Gmina Mirsk, close to the Czech border. It is situated on the upper Kwisa river north of the Jizera Mountains, within the historic region of Lower Silesia. As of 2019, the town has a population of 3,886.