Všeň is a village in Semily District, in the Liberec Region, Czechia. Všeň lies at 272 m above sea level, 9.1 km from the Giant mountains. It has 617 inhabitants (2024). The nearest city is Jablonec nad Nisou, 19.3 km to the north. Among the landmarks around are Kost Castle (7.9 km), Trosky Castle (10.1 km) and Valdštejn Castle (4.4 km). Among the natural features are Maškova zahrada (4.3 km) and Chrby (6.5 km).