Troskovice is a village in Semily District, in the Liberec Region, Czechia. Troskovice lies at 349 m above sea level, 6.6 km from the Giant mountains, by the Žehrovka. It has 80 inhabitants (2024). The nearest city is Mladá Boleslav, 24 km to the west. Among the landmarks around are Kost Castle (6.5 km), Trosky Castle (0.9 km) and Valdštejn Castle (6.9 km). Among the natural features are Zebín (12.6 km) and Čeřovka (12.3 km).