Olszewo-Borki [ɔlˈʂɛvɔ ˈbɔrki] is a village in Ostrołęka County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Olszewo-Borki. It lies approximately 4 kilometres (2 mi) west of Ostrołęka and 101 km (63 mi) north of Warsaw.