Ossolin [ɔsˈsɔlin] is a village in the administrative district of Gmina Siemiatycze, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 8 kilometres (5 mi) north-east of Siemiatycze and 74 km (46 mi) south of the regional capital Białystok.