Łęczyn Dolny [ˈwɛnt͡ʂɨn ˈdɔlnɨ] is a village in the administrative district of Gmina Gniewino, within Wejherowo County, Pomeranian Voivodeship, in northern Poland. It lies approximately 11 kilometres (7 mi) south-west of Gniewino, 21 km (13 mi) west of Wejherowo, and 55 km (34 mi) north-west of the regional capital Gdańsk.

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