Jesenný is a village in Semily District, in the Liberec Region, Czechia. Jesenný lies at 433 m above sea level, 1.2 km from the Giant mountains. It has 512 inhabitants (2024). The nearest city is Jablonec nad Nisou, 14.3 km to the west. Near the border: Poland, 13 km. Among the landmarks around are Trosky Castle (18.2 km), Valdštejn Castle (16.8 km) and Kost Castle (24 km). Among the natural features are Przełęcz Szklarska (18.3 km) and Mumlava Waterfall (14.2 km).