Tyszki-Nadbory [ˈtɨʂki nadˈbɔrɨ] is a village in the administrative district of Gmina Czerwin, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 11 kilometres (7 mi) north-east of Czerwin, 25 km (16 mi) south-east of Ostrołęka, and 105 km (65 mi) north-east of Warsaw.