Loučky is a village in Semily District, in the Liberec Region, Czechia. Loučky lies at 424 m above sea level, in the Giant mountains. It has 156 inhabitants (2024). The nearest city is Jablonec nad Nisou, 12.8 km to the northwest. Near the border: Poland, 21 km. Among the landmarks around are Trosky Castle (11.2 km), Kost Castle (15.3 km) and Valdštejn Castle (7.1 km). Among the natural features are Przełęcz Szklarska (27 km) and Postojna (2.1 km).