Długi Lasek [ˈdwuɡi ˈlasɛk] is a village in the administrative district of Gmina Korsze, within Kętrzyn County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 4 kilometres (2 mi) south-west of Korsze, 19 km (12 mi) west of Kętrzyn, and 57 km (35 mi) north-east of the regional capital Olsztyn.