Olszewo-Bołąki [ɔlˈʂɛvɔ bɔˈwɔŋki] is a village in the administrative district of Gmina Stupsk, within Mława County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) east of Stupsk, 13 km (8 mi) south-east of Mława, and 97 km (60 mi) north of Warsaw.