Sieńsk [ɕɛɲsk] is a village in the administrative district of Gmina Gubin, within Krosno Odrzańskie County, Lubusz Voivodeship, in western Poland, close to the German border. It lies approximately 12 kilometres (7 mi) south-east of Gubin, 29 km (18 mi) south-west of Krosno Odrzańskie, and 50 km (31 mi) west of Zielona Góra.