Zalesie [zaˈlɛɕɛ] is a village in the administrative district of Gmina Zawidz, within Sierpc County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) west of Zawidz, 11 km (7 mi) south-east of Sierpc, and 107 km (66 mi) north-west of Warsaw.