Mašov is a village in Semily District, in the Liberec Region, Czechia. Mašov lies at 290 m above sea level, 5.6 km from the Giant mountains. It has 660 inhabitants. The nearest city is Jablonec nad Nisou, 17.2 km to the north. Among the landmarks around are Kost Castle (9.3 km), Trosky Castle (8.5 km) and Valdštejn Castle (1.7 km). Among the natural features are Maškova zahrada (1.1 km) and Postojna (5.0 km).