Gmina Miastkowo is a rural gmina (administrative district) in Łomża County, Podlaskie Voivodeship, in north-eastern Poland. Its seat is the village of Miastkowo, which lies approximately 18 km west of Łomża and 91 km west of the regional capital Białystok. The gmina covers an area of 114.84 km2, and as of 2006 its total population is 4,306 (4,350 in 2011).

Villages

Gmina Miastkowo contains the villages and settlements of Bartkowizna, Cendrowizna, Czartoria, Drogoszewo, Gałkówka, Kaliszki, Kolonia Nowogrodzka, Korytki Leśne, Kraska, Kuleszka, Leopoldowo, Łubia, Łuby-Kiertany, Łuby-Kurki, Miastkowo, Naruszczki, Nowosiedliny, Orło, Osetno, Podosie, Rybaki, Rydzewo, Rydzewo-Gozdy, Sosnowiec, Sulki, Tarnowo and Zaruzie.

Neighbouring gminas

Gmina Miastkowo is bordered by the gminas of Lelis, Łomża, Nowogród, Rzekuń, Śniadowo, Troszyn and Zbójna.