Cierżnia [ˈt͡ɕɛrʐɲa] is a settlement in the administrative district of Gmina Wejherowo, within Wejherowo County, Pomeranian Voivodeship, in northern Poland.^[1] It lies approximately 11 kilometres (7 mi) south of Wejherowo and 27 km (17 mi) north-west of the regional capital Gdańsk.

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