Mostki [ˈmɔstki] is a village in the administrative district of Gmina Narewka, within Hajnówka County of Podlaskie Voivodeship in north-eastern Poland. This village is close to the border with Belarus. It lies approximately 10 kilometres (6 mi) north of Narewka, 26 km (16 mi) north-east of Hajnówka, and 48 km (30 mi) south east of the regional capital of Białystok.