Kościelna Jania [kɔɕˈt͡ɕɛlna ˈjaɲa] is a village in the administrative district of Gmina Smętowo Graniczne, within Starogard County, Pomeranian Voivodeship, in northern Poland. It lies approximately 6 kilometres (4 mi) west of Smętowo Graniczne, 25 km (16 mi) south of Starogard Gdański, and 69 km (43 mi) south of the regional capital Gdańsk.

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