Lachy [ˈlaxɨ] is a village in the administrative district of Gmina Narew, within Hajnówka County, Podlaskie Voivodeship, in northeast Poland. It lies approximately 12 kilometres (7 mi) southwest of Narew, 21 km (13 mi) northwest of Hajnówka, and 31 km (19 mi) southeast of the regional capital Białystok.