Olsza [ˈɔlʂa] is a village in the administrative district of Gmina Dąbrowa Białostocka, within Sokółka County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 8 kilometres (5 mi) west of Dąbrowa Białostocka, 35 km (22 mi) north-west of Sokółka, and 62 km (39 mi) north of the regional capital Białystok.