Długołęka (Polish pronunciation: [dwuɡɔˈwɛŋka]) is a village in the administrative district of Gmina Krypno, within Mońki County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 3 kilometres (2 mi) west of Krypno, 15 km (9 mi) south of Mońki, and 31 km (19 mi) north-west of the regional capital Białystok.