Olszewo Łomża County
 Olszewo [ɔlˈʂɛvɔ] is a village in the administrative district of Gmina Śniadowo within Łomża County Podlaskie Voivodeship in north-eastern Poland. It lies approximately 4 kilometres (2 mi) north-east of Śniadowo 14 km (9 mi) south of Łomża and 77 km (48 mi) west of the regional capital Białystok.