Długi Kąt [ˈdwuɡi ˈkɔnt] is a village in the administrative district of Gmina Lelis, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) north of Lelis, 17 km (11 mi) north of Ostrołęka, and 117 km (73 mi) north of Warsaw.