Białobrzeg Dalszy [bjaˈwɔbʐɛk ˈdalʂɨ] is a village in the administrative district of Gmina Olszewo-Borki, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 10 kilometres (6 mi) north-west of Ostrołęka and 105 km (65 mi) north of Warsaw.