Piski is a village in the administrative district of Gmina Czerwin, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) north-east of Czerwin, 23 km (14 mi) south-east of Ostrołęka, and 104 km (65 mi) north-east of Warsaw.