Babiec Piaseczny [ˈbabjɛt͡s pjaˈsɛt͡ʂnɨ] is a village in the administrative district of Gmina Rościszewo, within Sierpc County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) east of Sierpc and 115 km (71 mi) north-west of Warsaw.