Alvesta Municipality

municipality in Kronoberg County, Sweden

Åsnen () is a large lake in southern Småland, Sweden, roughly 150 km2 in size. The river Mörrumsån flows south from Åsnen into the Baltic Sea. The lake lies south of Alvesta and Växjö and northwest of Tingsryd and is the third-largest lake in Småland, after Vättern and Bolmen. Approximately 19 km2 of the lake's area is occupied by small islands. Åsnen has many small bays and islands, the largest of which is Sirkön. The lake has been designated as a Ramsar site since 1989. The lake is home to Åsnen National Park, established in 2018.