Sieńsko [ˈɕɛɲskɔ] is a village in the administrative district of Gmina Słupia, within Jędrzejów County, Świętokrzyskie Voivodeship, in south-central Poland. It lies approximately 6 kilometres (4 mi) east of Słupia, 18 km (11 mi) west of Jędrzejów, and 50 km (31 mi) south-west of the regional capital Kielce.