Osečná is a town in the Liberec District of the Liberec Region in the Czech Republic. Osečná lies on the Ploučnice River, which begins here. The river is 106 km long and flows into the Elbe at Děčín. It has 1075 inhabitants. It lies 15 kilometres from Liberec, on the foot of Ještěd. The town has a primary school, kindergarten, post office, several shops, hospital, and one of the oldest spas in Bohemia, Lázně Kundratice, which was founded in 1881. The moor is used here as a natural resource.