Leopoldowo [lɛɔpɔlˈdɔvɔ] is a village in the administrative district of Gmina Miastkowo, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 14 kilometres (9 mi) west of Łomża and 86 km (53 mi) west of the regional capital Białystok.