Sarni Dół (Polish pronunciation: [ˈsarɲi ˈduw]) is a settlement in the administrative district of Gmina Łukta, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 6 kilometres (4 mi) west of Łukta, 11 km (7 mi) north of Ostróda, and 33 km (21 mi) west of the regional capital Olsztyn.