Mosna [ˈmɔsna] is a village in the administrative district of Gmina Czersk, within Chojnice County, Pomeranian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) south-east of Czersk, 34 km (21 mi) east of Chojnice, and 78 km (48 mi) south-west of the regional capital Gdańsk.

For details of the history of the region, see History of Pomerania.