Łęsk [wɛ̃sk] is a settlement in the administrative district of Gmina Srokowo, within Kętrzyn County, Warmian-Masurian Voivodeship, in northern Poland, close to the border with the Kaliningrad Oblast of Russia. It lies approximately 6 kilometres (4 mi) west of Srokowo, 16 km (10 mi) north of Kętrzyn, and 79 km (49 mi) north-east of the regional capital Olsztyn.