Piasecznia [pjaˈsɛt͡ʂɲa] is a village in the administrative district of Gmina Kadzidło, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) west of Kadzidło, 23 km (14 mi) north-west of Ostrołęka, and 116 km (72 mi) north of Warsaw.