Cospudener See, Recreational lake in Leipzig, Germany

Cospudener See is an artificial lake on Leipzig's southern edge, shared by Leipzig, Markkleeberg and Zwenkau. It fills a former lignite opencast pit that was flooded to a level of 110 m above sea level by spring 2000. Its shores hold a 1 km long, 70 m wide sand beach, a landscape park, and the Zöbigker Winkel harbour with a 100 m marina.

Opened in 1981 as a branch of the Zwenkau opencast mine, Cospuden extracted about 32 million tons of lignite from 5.1 km² before mining stopped in 1992. The village of Cospuden, with 38 residents, was dredged over in 1981. Groundwater and pit water from Zwenkau and Profen raised the lake to its final level of 110 m above sea level in spring 2000.

The lake is part of the Neuseenland region where locals come together for water sports, swimming, and community gatherings throughout the year. People naturally congregate at the sandy beach and waterfront areas, creating a social space for families and groups.

The lake lies on the southern edge of Leipzig, with shores in Leipzig, Markkleeberg and Zwenkau. The North Shore Landscape Park has an entrance building with a bike rental station, and the Zöbigker Winkel on the east bank holds the Pier I water sports centre with boat rental. A 35-metre tower with 180 steps stands on the raised Bistumshöhe at the south shore.

The lake's name traces to Heinricus de Kozebude, recorded around 1216 as holder of the local manor; the village name passed through Kozbude, Kossebude and Kostworde before becoming Kospuden in 1875. Johann Sebastian Bach mentions the hamlet in his Peasant Cantata of 1740. The village itself, 38 residents, was dredged over during 1981.