Zalesie [zaˈlɛɕɛ] is a village in the administrative district of Gmina Glinojeck, within Ciechanów County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) east of Glinojeck, 20 km (12 mi) west of Ciechanów, and 80 km (50 mi) north-west of Warsaw.