Ciemno [ˈt͡ɕɛmnɔ] is a village in the administrative district of Gmina Kamionka, within Lubartów County, Lublin Voivodeship, in eastern Poland. It lies approximately 4 kilometres (2 mi) north of Kamionka, 12 km (7 mi) west of Lubartów, and 30 km (19 mi) north of the regional capital Lublin.