Kobylin [kɔˈbɨlin] is a village in the administrative district of Gmina Piątnica, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 13 kilometres (8 mi) north of Piątnica, 16 km (10 mi) north of Łomża, and 71 km (44 mi) west of the regional capital Białystok.