Kruczy Borek [ˈkrut͡ʂɨ ˈbɔrɛk] is a village in the administrative district of Gmina Zatory, within Pułtusk County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) north-west of Zatory, 10 km (6 mi) south of Pułtusk, and 46 km (29 mi) north of Warsaw.