Piaseczno [pjaˈsɛt͡ʂnɔ] is a village in the administrative district of Gmina Łoniów, within Sandomierz County, Świętokrzyskie Voivodeship, in south-central Poland. It lies approximately 5 kilometres (3 mi) east of Łoniów, 19 km (12 mi) south-west of Sandomierz, and 78 km (48 mi) south-east of the regional capital Kielce.